From: Charles McGarvey <chazmcgarvey@brokenzipper.com>
Date: Thu, 19 Nov 2009 03:01:06 +0000 (-0700)
Subject: minor refactoring and state progress
X-Git-Url: https://git.dogcows.com/gitweb?p=chaz%2Fyoink;a=commitdiff_plain;h=a31d65a998121df0651c57bfb68782e2a07d2e2f;hp=31d52677b38d935297d132bdbd956c655cd3feee

minor refactoring and state progress
---

diff --git a/src/Animation.cc b/src/Animation.cc
index b449a0f..aa754ce 100644
--- a/src/Animation.cc
+++ b/src/Animation.cc
@@ -66,10 +66,12 @@ class Animation::Impl
 		 * and the duration that is how long the slide will be shown.
 		 */
 
-		struct Frame
+		class Frame
 		{
-			unsigned	index;					///< Frame index.
-			Mf::Scalar	duration;				///< Frame duration.
+			friend class Impl;
+
+			unsigned	mIndex;					///< Frame index.
+			Mf::Scalar	mDuration;				///< Frame duration.
 
 			/**
 			 * Construction is initialization.  The frame data is loaded from a
@@ -77,15 +79,15 @@ class Animation::Impl
 			 */
 		
 			Frame(Mf::Script& script, Mf::Script::Value table) :
-				index(0),
-				duration(1.0)
+				mIndex(0),
+				mDuration(1.0)
 			{
 				table.pushField("index");
-				script[-1].get(index);
+				script[-1].get(mIndex);
 				script.pop();
 
 				table.pushField("duration");
-				script[-1].get(duration);
+				script[-1].get(mDuration);
 				script.pop();
 			}
 		};
@@ -98,10 +100,12 @@ class Animation::Impl
 
 		struct Sequence
 		{
-			std::vector<Frame>	frames;			///< List of frames.
-			Mf::Scalar			delay;			///< Scale frame durations.
-			bool				loop;			///< Does the sequence repeat?
-			std::string			next;			///< Next sequence name.
+			friend class Impl;
+
+			std::vector<Frame>	mFrames;		///< List of frames.
+			Mf::Scalar			mDelay;			///< Scale frame durations.
+			bool				mLoop;			///< Does the sequence repeat?
+			std::string			mNext;			///< Next sequence name.
 
 			/**
 			 * Construction is initialization.  The constructor loads sequence
@@ -111,19 +115,19 @@ class Animation::Impl
 			 */
 
 			Sequence(Mf::Script& script, Mf::Script::Value table) :
-				delay(0.0),
-				loop(true)
+				mDelay(0.0),
+				mLoop(true)
 			{
 				table.pushField("delay");
-				script[-1].get(delay);
+				script[-1].get(mDelay);
 				script.pop();
 
 				table.pushField("loop");
-				script[-1].get(loop);
+				script[-1].get(mLoop);
 				script.pop();
 
 				table.pushField("next");
-				script[-1].get(next);
+				script[-1].get(mNext);
 				script.pop();
 
 				// TODO - sequence class/type not yet implemented
@@ -140,7 +144,7 @@ class Animation::Impl
 						script.push(index);
 						frameTable.pushField();
 
-						if (top.isTable()) frames.push_back(Frame(script, top));
+						if (top.isTable()) mFrames.push_back(Frame(script, top));
 						else               break;
 
 						++index;
@@ -224,12 +228,12 @@ class Animation::Impl
 	 */
 
 	Impl(const std::string& name) :
-		data(Data::getInstance(name)),
-		currentSequence(0),
-		frameCounter(0),
-		frameIndex(0),
-		timeAccum(0),
-		frameDuration(0) {}
+		mData(Data::getInstance(name)),
+		mCurrentSequence(0),
+		mFrameCounter(0),
+		mFrameIndex(0),
+		mTimeAccum(0),
+		mFrameDuration(0) {}
 
 
 	/**
@@ -242,16 +246,16 @@ class Animation::Impl
 	{
 		std::map<std::string,Data::Sequence>::iterator it;
 
-		it = data->sequences.find(name);
+		it = mData->sequences.find(name);
 
-		if (it != data->sequences.end())
+		if (it != mData->sequences.end())
 		{
-			currentSequence = &(*it).second;
-			frameCounter = 0;
-			frameIndex = currentSequence->frames[0].index;
-			timeAccum = 0.0;
-			frameDuration = currentSequence->delay *
-				currentSequence->frames[0].duration;
+			mCurrentSequence = &(*it).second;
+			mFrameCounter = 0;
+			mFrameIndex = mCurrentSequence->mFrames[0].mIndex;
+			mTimeAccum = 0.0;
+			mFrameDuration = mCurrentSequence->mDelay *
+				mCurrentSequence->mFrames[0].mDuration;
 		}
 	}
 
@@ -267,62 +271,62 @@ class Animation::Impl
 
 	void update(Mf::Scalar t, Mf::Scalar dt)
 	{
-		if (currentSequence)
+		if (mCurrentSequence)
 		{
-			timeAccum += dt;
+			mTimeAccum += dt;
 
-			if (timeAccum >= frameDuration)
+			if (mTimeAccum >= mFrameDuration)
 			{
-				if (++frameCounter >= currentSequence->frames.size())
+				if (++mFrameCounter >= mCurrentSequence->mFrames.size())
 				{
-					if (!currentSequence->next.empty())
+					if (!mCurrentSequence->mNext.empty())
 					{
-						startSequence(currentSequence->next);
+						startSequence(mCurrentSequence->mNext);
 					}
-					else if (currentSequence->loop)
+					else if (mCurrentSequence->mLoop)
 					{
-						frameCounter = 0;
+						mFrameCounter = 0;
 					}
 					else
 					{
-						frameCounter--;
-						currentSequence = 0;
+						mFrameCounter--;
+						mCurrentSequence = 0;
 					}
 				}
 
-				frameIndex = currentSequence->frames[frameCounter].index;
-				timeAccum = frameDuration - timeAccum;
-				frameDuration = currentSequence->delay *
-					currentSequence->frames[frameCounter].duration;
+				mFrameIndex = mCurrentSequence->mFrames[mFrameCounter].mIndex;
+				mTimeAccum = mFrameDuration - mTimeAccum;
+				mFrameDuration = mCurrentSequence->mDelay *
+					mCurrentSequence->mFrames[mFrameCounter].mDuration;
 			}
 		}
 	}
 
-	boost::shared_ptr<Data>	data;				///< Internal data.
+	boost::shared_ptr<Data>	mData;				///< Internal data.
 
-	Data::Sequence*			currentSequence;	///< Active sequence.
-	unsigned				frameCounter;		///< Current frame.
-	unsigned				frameIndex;			///< Index of current frame.
-	Mf::Scalar				timeAccum;			///< Time accumulation.
-	Mf::Scalar				frameDuration;		///< Scaled frame duration.
+	Data::Sequence*			mCurrentSequence;	///< Active sequence.
+	unsigned				mFrameCounter;		///< Current frame.
+	unsigned				mFrameIndex;		///< Index of current frame.
+	Mf::Scalar				mTimeAccum;			///< Time accumulation.
+	Mf::Scalar				mFrameDuration;		///< Scaled frame duration.
 };
 
 
 Animation::Animation(const std::string& name) :
 	// pass through
-	impl_(new Animation::Impl(name)) {}
+	mImpl(new Animation::Impl(name)) {}
 
 
 void Animation::startSequence(const std::string& name)
 {
 	// pass through
-	impl_->startSequence(name);
+	mImpl->startSequence(name);
 }
 
 void Animation::update(Mf::Scalar t, Mf::Scalar dt)
 {
 	// pass through
-	impl_->update(t, dt);
+	mImpl->update(t, dt);
 }
 
 
@@ -333,7 +337,7 @@ void Animation::update(Mf::Scalar t, Mf::Scalar dt)
 
 unsigned Animation::getFrame() const
 {
-	return impl_->frameIndex;
+	return mImpl->mFrameIndex;
 }
 
 
diff --git a/src/Animation.hh b/src/Animation.hh
index 30f0348..5cfd260 100644
--- a/src/Animation.hh
+++ b/src/Animation.hh
@@ -56,7 +56,7 @@ typedef boost::shared_ptr<Animation> AnimationP;
 class Animation : public Mf::Resource
 {
 	class Impl;
-	boost::shared_ptr<Impl> impl_;
+	boost::shared_ptr<Impl> mImpl;
 
 public:
 
diff --git a/src/Character.cc b/src/Character.cc
index e0ce1c0..f12ed5f 100644
--- a/src/Character.cc
+++ b/src/Character.cc
@@ -44,8 +44,8 @@ struct SpringForce
 		Mf::Scalar d = 50.0;
 
 		// spring:
-		//current.force += -15.0 * x - 1.5 * current.velocity;
-		force = -20.0 * (mag - d) * (x / mag) - 2.0 * state.velocity;
+		//mState.force += -15.0 * x - 1.5 * mState.velocity;
+		force = SCALAR(-10.0) * (mag - d) * (x / mag) - 2.0 * state.velocity;
 
 		return force;
 	}
@@ -78,61 +78,46 @@ Character::Character(const std::string& name) :
 	tilemap(name),
 	animation(name)
 {
-	current.init();
+	mState.init();
 
-	current.mass = 1.0;
-	current.inverseMass = 1.0 / current.mass;
+	mState.mass = 1.0;
+	mState.inverseMass = 1.0 / mState.mass;
 
 	// forces
-	current.force = Mf::Vector2(0.0, 0.0);
-	current.forces.push_back(SpringForce(Mf::Vector2(500.0, 200.0)));
-	current.forces.push_back(ResistanceForce(2.0));
-	current.forces.push_back(Mf::LinearState<2>::GravityForce(-1000.0));
+	mState.force = Mf::Vector2(0.0, 0.0);
+	//mState.forces.push_back(SpringForce(Mf::Vector2(500.0, 200.0)));
+	mState.forces.push_back(ResistanceForce(2.0));
+	//mState.forces.push_back(Mf::LinearState<2>::GravityForce(-100.0));
 
 	// starting position
-	current.position = Mf::Vector2(64.0, 64.0);
-	current.momentum = Mf::Vector2(0.0, 0.0);
-	current.recalculate();
+	mState.position = Mf::Vector2(64.0, 64.0);
+	mState.momentum = Mf::Vector2(0.0, 0.0);
+	mState.recalculate();
 
-	previous = current;
+	mPrevState = mState;
 }
 
 
 void Character::update(Mf::Scalar t, Mf::Scalar dt)
 {
-	previous = current;
+	Mf::RigidBody2::update(t, dt); // update physics
 
-	//Mf::Vector2 x = current.position - Mf::Vector2(500.0, 200.0);
-	//Mf::Scalar mag = x.length();
-	//Mf::Scalar d = 50.0;
-
-	//// gravity:
-	//current.force = Mf::Vector2(0.0, -2000.0);
-	//// spring:
-	////current.force += -15.0 * x - 1.5 * current.velocity;
-	//current.force += -20.0 * (mag - d) * (x / mag) - 2.0 * current.velocity;
-	//// internal:
-	//current.force += userForce;
-	//current.recalculate();
-	//std::cout << "force: " << current.momentum << std::endl;
-
-	//Mf::euler<State,Derivative>(current, t, dt);
-
-	current.integrate(t, dt);
 	animation.update(t, dt);
 
-	Mf::Vector3 center(current.position[0], current.position[1], z);
-	Mf::Vector3 a(current.position[0] - 16.0, current.position[1] - 16.0, z);
-	Mf::Vector3 b(current.position[0] + 16.0, current.position[1] + 16.0, z);
+	Mf::Vector3 center(mState.position[0], mState.position[1], z);
+	Mf::Vector3 a(mState.position[0] - 16.0, mState.position[1] - 16.0, z);
+	Mf::Vector3 b(mState.position[0] + 16.0, mState.position[1] + 16.0, z);
 
-	aabb_.init(a, b);
-	sphere_.init(center, a);
+	mAabb.init(a, b);
+	mSphere.init(center, a);
 }
 
 
 void Character::draw(Mf::Scalar alpha) const
 {
-	Mf::Vector2 position = cml::lerp(previous.position, current.position, alpha);
+	//Mf::Vector2 position = cml::lerp(mPrevState.position, mState.position, alpha);
+	Mf::State2 state = getState(alpha);
+	Mf::Vector2 position = state.position;
 
 	//glColor3f(1.0f, 1.0f, 1.0f);
 	tilemap.bind();
@@ -141,7 +126,7 @@ void Character::draw(Mf::Scalar alpha) const
 
 	Tilemap::Orientation orientation = Tilemap::NORMAL;
 
-	if (current.velocity[0] < 0.0) orientation = Tilemap::REVERSE;
+	if (mState.velocity[0] < 0.0) orientation = Tilemap::REVERSE;
 
 	Mf::Scalar coords[8];
 	tilemap.getTileCoords(frame, coords, orientation);
@@ -172,22 +157,6 @@ void Character::draw(Mf::Scalar alpha) const
 }
 
 
-bool Character::isInsideAabb(const Mf::Aabb& aabb) const
-{
-	// make sure the entity is fully inside the volume
-	if (!(aabb_.max[0] < aabb.max[0] &&
-		  aabb_.min[0] > aabb.min[0] &&
-		  aabb_.max[1] < aabb.max[1] &&
-		  aabb_.min[1] > aabb.min[1] &&
-		  aabb_.max[2] < aabb.max[2] &&
-		  aabb_.min[2] > aabb.min[2]))
-	{
-		return false;
-	}
-
-	return true;
-}
-
 int Character::getOctant(const Mf::Aabb& aabb) const
 {
 	int octantNum = -1;
@@ -195,28 +164,28 @@ int Character::getOctant(const Mf::Aabb& aabb) const
 	Mf::Plane::Halfspace halfspace;
 
 	Mf::Plane xy = aabb.getPlaneXY();
-	halfspace = xy.intersects(sphere_);
+	halfspace = xy.intersects(mSphere);
 	if (halfspace == Mf::Plane::INTERSECT)
 	{
-		halfspace = xy.intersects(aabb_);
+		halfspace = xy.intersects(mAabb);
 	}
 
 	if (halfspace == Mf::Plane::POSITIVE)
 	{
 		Mf::Plane xz = aabb.getPlaneXZ();
-		halfspace = xz.intersects(sphere_);
+		halfspace = xz.intersects(mSphere);
 		if (halfspace == Mf::Plane::INTERSECT)
 		{
-			halfspace = xz.intersects(aabb_);
+			halfspace = xz.intersects(mAabb);
 		}
 
 		if (halfspace == Mf::Plane::POSITIVE)
 		{
 			Mf::Plane yz = aabb.getPlaneYZ();
-			halfspace = yz.intersects(sphere_);
+			halfspace = yz.intersects(mSphere);
 			if (halfspace == Mf::Plane::INTERSECT)
 			{
-				halfspace = yz.intersects(aabb_);
+				halfspace = yz.intersects(mAabb);
 			}
 
 			if (halfspace == Mf::Plane::POSITIVE)
@@ -231,10 +200,10 @@ int Character::getOctant(const Mf::Aabb& aabb) const
 		else if (halfspace == Mf::Plane::NEGATIVE)
 		{
 			Mf::Plane yz = aabb.getPlaneYZ();
-			halfspace = yz.intersects(sphere_);
+			halfspace = yz.intersects(mSphere);
 			if (halfspace == Mf::Plane::INTERSECT)
 			{
-				halfspace = yz.intersects(aabb_);
+				halfspace = yz.intersects(mAabb);
 			}
 
 			if (halfspace == Mf::Plane::POSITIVE)
@@ -250,19 +219,19 @@ int Character::getOctant(const Mf::Aabb& aabb) const
 	else if (halfspace == Mf::Plane::NEGATIVE)
 	{
 		Mf::Plane xz = aabb.getPlaneXZ();
-		halfspace = xz.intersects(sphere_);
+		halfspace = xz.intersects(mSphere);
 		if (halfspace == Mf::Plane::INTERSECT)
 		{
-			halfspace = xz.intersects(aabb_);
+			halfspace = xz.intersects(mAabb);
 		}
 
 		if (halfspace == Mf::Plane::POSITIVE)
 		{
 			Mf::Plane yz = aabb.getPlaneYZ();
-			halfspace = yz.intersects(sphere_);
+			halfspace = yz.intersects(mSphere);
 			if (halfspace == Mf::Plane::INTERSECT)
 			{
-				halfspace = yz.intersects(aabb_);
+				halfspace = yz.intersects(mAabb);
 			}
 
 			if (halfspace == Mf::Plane::POSITIVE)
@@ -277,10 +246,10 @@ int Character::getOctant(const Mf::Aabb& aabb) const
 		else if (halfspace == Mf::Plane::NEGATIVE)
 		{
 			Mf::Plane yz = aabb.getPlaneYZ();
-			halfspace = yz.intersects(sphere_);
+			halfspace = yz.intersects(mSphere);
 			if (halfspace == Mf::Plane::INTERSECT)
 			{
-				halfspace = yz.intersects(aabb_);
+				halfspace = yz.intersects(mAabb);
 			}
 
 			if (halfspace == Mf::Plane::POSITIVE)
diff --git a/src/Character.hh b/src/Character.hh
index 50c3da5..5dfde01 100644
--- a/src/Character.hh
+++ b/src/Character.hh
@@ -35,7 +35,7 @@
 #include <Moof/Entity.hh>
 #include <Moof/Math.hh>
 #include <Moof/Octree.hh>
-#include <Moof/Physics.hh>
+#include <Moof/RigidBody.hh>
 #include <Moof/Sphere.hh>
 
 #include "Animation.hh"
@@ -52,12 +52,8 @@ typedef boost::shared_ptr<Character> CharacterP;
  * includes the heroine herself and the bad guys.
  */
 
-struct Character : public Mf::Entity, public Mf::OctreeInsertable
+class Character : public Mf::RigidBody2, public Mf::OctreeInsertable
 {
-protected:
-
-	Mf::Vector2 userForce;
-
 public:
 
 	Character(const std::string& name);
@@ -66,17 +62,10 @@ public:
 	virtual void update(Mf::Scalar t, Mf::Scalar dt);
 	virtual void draw(Mf::Scalar alpha) const;
 
-	virtual bool isInsideAabb(const Mf::Aabb& aabb) const;
 	virtual int getOctant(const Mf::Aabb& aabb) const;
 
-	Mf::State2		previous;
-	Mf::State2		current;
-
-	Tilemap			tilemap;
-	Animation		animation;
-
-	Mf::Aabb		aabb_;
-	Mf::Sphere		sphere_;
+	Tilemap		tilemap;
+	Animation	animation;
 
 private:
 
diff --git a/src/GameLayer.cc b/src/GameLayer.cc
index e7ab9e8..a80946f 100644
--- a/src/GameLayer.cc
+++ b/src/GameLayer.cc
@@ -40,56 +40,56 @@
 
 
 GameLayer::GameLayer() :
-	music("BeatTheCube"),
-	punchSound("Thump")
+	mMusic("BeatTheCube"),
+	mPunchSound("Thump")
 {
-	music.setLooping(true);
-	music.enqueue("NightFusionLoop");
-	music.stream();
+	mMusic.setLooping(true);
+	mMusic.enqueue("NightFusionLoop");
+	mMusic.stream();
 
-	heroine = Heroine::alloc();
-	heroine->animation.startSequence("FlyDiagonallyUp");
+	mHeroine = Heroine::alloc();
+	mHeroine->animation.startSequence("FlyDiagonallyUp");
 
 	Mf::Scalar a[6] = {0.0, 1.5, -0.5, 3.0, -2.0, 1.0};
-	interp.init(a, 2.0, Mf::Interpolator::OSCILLATE);
+	mInterp.init(a, 2.0, Mf::Interpolator::OSCILLATE);
 
-	scene = Scene::alloc("Classic");
+	mScene = Scene::alloc("Classic");
 
 	setProjection();
 
-	hud = Hud::alloc();
+	mHud = Hud::alloc();
 }
 
 
 void GameLayer::pushed(Mf::Engine& engine)
 {
-	engine.push(hud);
+	engine.push(mHud);
 }
 
 
 void GameLayer::update(Mf::Scalar t, Mf::Scalar dt)
 {
-	camera.update(t, dt);
-	heroine->update(t, dt);
+	mCamera.update(t, dt);
+	mHeroine->update(t, dt);
 
-	scene->checkForCollision(*heroine);
+	mScene->checkForCollision(*mHeroine);
 
-	//camera.lookAt(heroine->getSphere().point);
-	camera.setPosition(Mf::Vector3(-heroine->current.position[0],
-				-heroine->current.position[1], -256));
+	mCamera.setPosition(Mf::Vector3(-mHeroine->getState().position[0],
+				-mHeroine->getState().position[1], -256));
+	//mCamera.lookAt(Mf::promote(mHeroine->getState().position));
 
-	//Mf::Vector3 heroinePosition = Mf::promote(heroine->current.position);
+	//Mf::Vector3 heroinePosition = Mf::promote(mHeroine->getState().position);
 	//Mf::Sound::setListenerPosition(heroinePosition);
 	
-	interp.update(t, dt);
-	hud->setBar1Progress(interp.getState(dt));
-	hud->setBar2Progress(1.0 - interp.getState(dt));
+	mInterp.update(t, dt);
+	mHud->setBar1Progress(mInterp.getState(dt));
+	mHud->setBar2Progress(1.0 - mInterp.getState(dt));
 }
 
 
 void GameLayer::draw(Mf::Scalar alpha) const
 {
-	camera.uploadToGL();
+	mCamera.uploadToGL(alpha);
 
 	// DRAW THE SCENE
 	Mf::Texture::resetBind();
@@ -97,9 +97,9 @@ void GameLayer::draw(Mf::Scalar alpha) const
 	glEnableClientState(GL_VERTEX_ARRAY);
 	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 
-	scene->drawIfVisible(alpha, camera.getFrustum());
+	mScene->drawIfVisible(alpha, mCamera.getFrustum());
 
-	heroine->draw(alpha);
+	mHeroine->draw(alpha);
 }
 
 bool GameLayer::handleEvent(const Mf::Event& event)
@@ -109,14 +109,14 @@ bool GameLayer::handleEvent(const Mf::Event& event)
 		case SDL_KEYDOWN:
 			if (event.key.keysym.sym == SDLK_SPACE)
 			{
-				heroine->animation.startSequence("Flattened");
+				mHeroine->animation.startSequence("Flattened");
 				Mf::logInfo("thump!");
-				punchSound.play();
+				mPunchSound.play();
 				return true;
 			}
 			else if (event.key.keysym.sym == SDLK_p)
 			{
-				music.toggle();
+				mMusic.toggle();
 				return true;
 			}
 			else if (event.key.keysym.sym == SDLK_y)
@@ -126,11 +126,11 @@ bool GameLayer::handleEvent(const Mf::Event& event)
 			}
 
 		case SDL_KEYUP:
-			return heroine->handleEvent(event);
+			return mHeroine->handleEvent(event);
 
 		case SDL_MOUSEMOTION:
 		case SDL_MOUSEBUTTONDOWN:
-			camera.handleEvent(event);
+			mCamera.handleEvent(event);
 			return true;
 
 		case SDL_VIDEORESIZE:
@@ -150,7 +150,7 @@ void GameLayer::setProjection()
 
 void GameLayer::setProjection(Mf::Scalar width, Mf::Scalar height)
 {
-	camera.setProjection(cml::rad(60.0), width / height, 32.0, 2500.0);
+	mCamera.setProjection(cml::rad(60.0), width / height, 32.0, 2500.0);
 }
 
 
diff --git a/src/GameLayer.hh b/src/GameLayer.hh
index c4c5420..a1b5d6d 100644
--- a/src/GameLayer.hh
+++ b/src/GameLayer.hh
@@ -75,17 +75,18 @@ private:
 	void setProjection();
 	void setProjection(Mf::Scalar width, Mf::Scalar height);
 
-	Mf::Sound music;
 
-	HeroineP	heroine;
-	SceneP		scene;
-	Mf::Sound punchSound;
+	Mf::Sound		mMusic;
 
-	Mf::PolynomialInterpolator<5> interp;
+	HeroineP		mHeroine;
+	SceneP			mScene;
+	Mf::Sound 		mPunchSound;
 
-	Mf::Camera camera;
+	Mf::PolynomialInterpolator<5> mInterp;
 
-	HudP hud;
+	Mf::Camera		mCamera;
+
+	HudP			mHud;
 };
 
 
diff --git a/src/Heroine.cc b/src/Heroine.cc
index 7a751a0..2071a7b 100644
--- a/src/Heroine.cc
+++ b/src/Heroine.cc
@@ -43,44 +43,44 @@ bool Heroine::handleEvent(const Mf::Event& event)
 		case SDL_KEYDOWN:
 			if (event.key.keysym.sym == SDLK_a)
 			{
-				current.force += Mf::Vector2(-force, 0.0);
+				mState.force += Mf::Vector2(-force, 0.0);
 				return true;
 			}
 			else if (event.key.keysym.sym == SDLK_d)
 			{
-				current.force += Mf::Vector2(force, 0.0);
+				mState.force += Mf::Vector2(force, 0.0);
 				return true;
 			}
 			else if (event.key.keysym.sym == SDLK_s)
 			{
-				current.force += Mf::Vector2(0.0, -force);
+				mState.force += Mf::Vector2(0.0, -force);
 				return true;
 			}
 			else if (event.key.keysym.sym == SDLK_w)
 			{
-				current.force += Mf::Vector2(0.0, force);
+				mState.force += Mf::Vector2(0.0, force);
 				return true;
 			}
 
 		case SDL_KEYUP:
 			if (event.key.keysym.sym == SDLK_a)
 			{
-				current.force += Mf::Vector2(force, 0.0);
+				mState.force += Mf::Vector2(force, 0.0);
 				return true;
 			}
 			else if (event.key.keysym.sym == SDLK_d)
 			{
-				current.force += Mf::Vector2(-force, 0.0);
+				mState.force += Mf::Vector2(-force, 0.0);
 				return true;
 			}
 			else if (event.key.keysym.sym == SDLK_s)
 			{
-				current.force += Mf::Vector2(0.0, force);
+				mState.force += Mf::Vector2(0.0, force);
 				return true;
 			}
 			else if (event.key.keysym.sym == SDLK_w)
 			{
-				current.force += Mf::Vector2(0.0, -force);
+				mState.force += Mf::Vector2(0.0, -force);
 				return true;
 			}
 	}
diff --git a/src/Heroine.hh b/src/Heroine.hh
index 2fb40c3..7169987 100644
--- a/src/Heroine.hh
+++ b/src/Heroine.hh
@@ -41,12 +41,13 @@ typedef boost::shared_ptr<Heroine> HeroineP;
 
 
 /**
- * Parent class of animate objects with "personalities."  This basically
- * includes the heroine herself and the bad guys.
+ * The protagonist.
  */
 
-struct Heroine : public Character
+class Heroine : public Character
 {
+public:
+
 	Heroine();
 
 	static HeroineP alloc()
diff --git a/src/Hud.cc b/src/Hud.cc
index 84b7bc1..a7e141e 100644
--- a/src/Hud.cc
+++ b/src/Hud.cc
@@ -34,14 +34,14 @@
 
 
 ProgressBar::ProgressBar(const Tilemap& tilemap, Tilemap::Index index) :
-	progress_(0.0),
-	tilemap_(tilemap)
+	mProgress(0.0),
+	mTilemap(tilemap)
 {
-	tilemap.getTileCoords(index, texCoords_);
+	tilemap.getTileCoords(index, mTexCoords);
 
-	Mf::Scalar half = (texCoords_[2] - texCoords_[0]) / 2.0 + texCoords_[0];
-	midCoords_[0] = half - 0.01;
-	midCoords_[1] = half + 0.01;
+	Mf::Scalar half = (mTexCoords[2] - mTexCoords[0]) / 2.0 + mTexCoords[0];
+	mMidCoords[0] = half - 0.01;
+	mMidCoords[1] = half + 0.01;
 }
 
 void ProgressBar::resize(const Mf::Rectangle& rect)
@@ -49,79 +49,79 @@ void ProgressBar::resize(const Mf::Rectangle& rect)
 	Mf::Scalar height = rect.max[1] - rect.min[1];
 	Mf::Scalar halfHeight = height / 2.0;
 
-	width_ = rect.max[0] - rect.min[0] - height;
+	mWidth = rect.max[0] - rect.min[0] - height;
 	// assert width > 0
 
-	vertices_[0] = rect.min;
-	vertices_[1] = Mf::Vector2(rect.min[0] + halfHeight, rect.min[1]);
-	vertices_[2] = vertices_[1];
-	vertices_[3] = Mf::Vector2(rect.min[0] + height,     rect.min[1]);
-	vertices_[4] = Mf::Vector2(rect.min[0] + height,     rect.max[1]);
-	vertices_[5] = Mf::Vector2(rect.min[0] + halfHeight, rect.max[1]);
-	vertices_[6] = vertices_[5];
-	vertices_[7] = Mf::Vector2(rect.min[0],              rect.max[1]);
+	mVertices[0] = rect.min;
+	mVertices[1] = Mf::Vector2(rect.min[0] + halfHeight, rect.min[1]);
+	mVertices[2] = mVertices[1];
+	mVertices[3] = Mf::Vector2(rect.min[0] + height,     rect.min[1]);
+	mVertices[4] = Mf::Vector2(rect.min[0] + height,     rect.max[1]);
+	mVertices[5] = Mf::Vector2(rect.min[0] + halfHeight, rect.max[1]);
+	mVertices[6] = mVertices[5];
+	mVertices[7] = Mf::Vector2(rect.min[0],              rect.max[1]);
 
-	setProgress(progress_);
+	setProgress(mProgress);
 }
 
 void ProgressBar::setProgress(Mf::Scalar progress)
 {
-	Mf::Scalar halfHeight = (vertices_[7][1] - vertices_[0][1]) / 2.0;
+	Mf::Scalar halfHeight = (mVertices[7][1] - mVertices[0][1]) / 2.0;
 
-	vertices_[2][0] = vertices_[1][0] + progress * width_;
-	vertices_[3][0] = vertices_[1][0] + progress * width_ + halfHeight;
-	vertices_[4][0] = vertices_[1][0] + progress * width_ + halfHeight;
-	vertices_[5][0] = vertices_[1][0] + progress * width_;
+	mVertices[2][0] = mVertices[1][0] + progress * mWidth;
+	mVertices[3][0] = mVertices[1][0] + progress * mWidth + halfHeight;
+	mVertices[4][0] = mVertices[1][0] + progress * mWidth + halfHeight;
+	mVertices[5][0] = mVertices[1][0] + progress * mWidth;
 
-	progress_ = progress;
+	mProgress = progress;
 }
 
 void ProgressBar::draw(Mf::Scalar alpha) const
 {
-	if (Mf::isEqual(progress_, 0.0))
+	if (Mf::isEqual(mProgress, 0.0))
 	{
 		// don't draw anything if the progress is 0%
 		return;
 	}
 
 	glColor4f(1.0f, 1.0f, 1.0f, 0.85f);
-	tilemap_.bind();
+	mTilemap.bind();
 
 	glBegin(GL_QUADS);
-		glTexCoord2(texCoords_[0], texCoords_[1]);
-		glVertex2v(vertices_[0].data());
-		glTexCoord2(midCoords_[0], texCoords_[3]);
-		glVertex2v(vertices_[1].data());
-		glTexCoord2(midCoords_[0], texCoords_[5]);
-		glVertex2v(vertices_[6].data());
-		glTexCoord2(texCoords_[6], texCoords_[7]);
-		glVertex2v(vertices_[7].data());
-
-		glTexCoord2(midCoords_[0], texCoords_[1]);
-		glVertex2v(vertices_[1].data());
-		glTexCoord2(midCoords_[1], texCoords_[3]);
-		glVertex2v(vertices_[2].data());
-		glTexCoord2(midCoords_[1], texCoords_[5]);
-		glVertex2v(vertices_[5].data());
-		glTexCoord2(midCoords_[0], texCoords_[7]);
-		glVertex2v(vertices_[6].data());
-
-		glTexCoord2(midCoords_[1], texCoords_[1]);
-		glVertex2v(vertices_[2].data());
-		glTexCoord2(texCoords_[2], texCoords_[3]);
-		glVertex2v(vertices_[3].data());
-		glTexCoord2(texCoords_[4], texCoords_[5]);
-		glVertex2v(vertices_[4].data());
-		glTexCoord2(midCoords_[1], texCoords_[7]);
-		glVertex2v(vertices_[5].data());
+		glTexCoord2(mTexCoords[0], mTexCoords[1]);
+		glVertex2v(mVertices[0].data());
+		glTexCoord2(mMidCoords[0], mTexCoords[3]);
+		glVertex2v(mVertices[1].data());
+		glTexCoord2(mMidCoords[0], mTexCoords[5]);
+		glVertex2v(mVertices[6].data());
+		glTexCoord2(mTexCoords[6], mTexCoords[7]);
+		glVertex2v(mVertices[7].data());
+
+		glTexCoord2(mMidCoords[0], mTexCoords[1]);
+		glVertex2v(mVertices[1].data());
+		glTexCoord2(mMidCoords[1], mTexCoords[3]);
+		glVertex2v(mVertices[2].data());
+		glTexCoord2(mMidCoords[1], mTexCoords[5]);
+		glVertex2v(mVertices[5].data());
+		glTexCoord2(mMidCoords[0], mTexCoords[7]);
+		glVertex2v(mVertices[6].data());
+
+		glTexCoord2(mMidCoords[1], mTexCoords[1]);
+		glVertex2v(mVertices[2].data());
+		glTexCoord2(mTexCoords[2], mTexCoords[3]);
+		glVertex2v(mVertices[3].data());
+		glTexCoord2(mTexCoords[4], mTexCoords[5]);
+		glVertex2v(mVertices[4].data());
+		glTexCoord2(mMidCoords[1], mTexCoords[7]);
+		glVertex2v(mVertices[5].data());
 	glEnd();
 }
 
 
 Hud::Hud() :
-	bar1_(Tilemap("StatusBars"), 0),
-	bar2_(Tilemap("StatusBars"), 2),
-	font_("Font")
+	mBar1(Tilemap("StatusBars"), 0),
+	mBar2(Tilemap("StatusBars"), 2),
+	mFont("Font")
 {
 	resize(800, 600);
 }
@@ -129,15 +129,15 @@ Hud::Hud() :
 
 void Hud::resize(int width, int height)
 {
-	cml::matrix_orthographic_RH(projection_, 
+	cml::matrix_orthographic_RH(mProjection, 
 			SCALAR(0.0), 
 			Mf::Scalar(width), SCALAR(0.0), Mf::Scalar(height),
 			SCALAR(1.0), SCALAR(-1.0), cml::z_clip_neg_one);
 
 	// position the two progress bars at the top-left of the screen
-	bar1_.resize(Mf::Rectangle(20, height - 51,
+	mBar1.resize(Mf::Rectangle(20, height - 51,
 				0.7 * width, height - 3));
-	bar2_.resize(Mf::Rectangle(20, height - 28,
+	mBar2.resize(Mf::Rectangle(20, height - 28,
 				0.7 * width, height - 70));
 
 	setBar1Progress(0.05);
@@ -149,7 +149,7 @@ void Hud::draw(Mf::Scalar alpha) const
 {
 	glMatrixMode(GL_PROJECTION);
 	glPushMatrix();
-	glLoadMatrix(projection_.data());
+	glLoadMatrix(mProjection.data());
 
 	glMatrixMode(GL_MODELVIEW);
 	glPushMatrix();
@@ -158,8 +158,8 @@ void Hud::draw(Mf::Scalar alpha) const
 	glDisable(GL_DEPTH_TEST);
 	glEnable(GL_BLEND);
 
-	bar1_.draw();
-	bar2_.draw();
+	mBar1.draw();
+	mBar2.draw();
 
 	glDisable(GL_BLEND);
 	glEnable(GL_DEPTH_TEST);
diff --git a/src/Hud.hh b/src/Hud.hh
index f386fd4..59f0631 100644
--- a/src/Hud.hh
+++ b/src/Hud.hh
@@ -42,6 +42,8 @@
 #include "Tilemap.hh"
 
 
+// TODO this stuff is still just hacked up
+
 class ProgressBar : public Mf::Drawable
 {
 public:
@@ -56,14 +58,14 @@ public:
 
 private:
 
-	Mf::Scalar	progress_;
+	Mf::Scalar	mProgress;
 
-	Mf::Vector2	vertices_[8];
-	Mf::Scalar	width_;
+	Mf::Vector2	mVertices[8];
+	Mf::Scalar	mWidth;
 
-	Tilemap		tilemap_;
-	Mf::Scalar	texCoords_[8];
-	Mf::Scalar	midCoords_[2];
+	Tilemap		mTilemap;
+	Mf::Scalar	mTexCoords[8];
+	Mf::Scalar	mMidCoords[2];
 };
 
 
@@ -84,13 +86,13 @@ public:
 	void setBar1Progress(Mf::Scalar progress)
 	{
 		// pass through
-		bar1_.setProgress(progress);
+		mBar1.setProgress(progress);
 	}
 
 	void setBar2Progress(Mf::Scalar progress)
 	{
 		// pass through
-		bar2_.setProgress(progress);
+		mBar2.setProgress(progress);
 	}
 
 	void setNumber(unsigned value);
@@ -102,13 +104,13 @@ public:
 
 private:
 
-	ProgressBar	bar1_;
-	ProgressBar	bar2_;
+	ProgressBar	mBar1;
+	ProgressBar	mBar2;
 
-	unsigned	number_;
-	Tilemap		font_;
+	unsigned	mNumber;
+	Tilemap		mFont;
 
-	Mf::Matrix4	projection_;
+	Mf::Matrix4	mProjection;
 };
 
 
diff --git a/src/MainLayer.cc b/src/MainLayer.cc
index 2e68785..85828c7 100644
--- a/src/MainLayer.cc
+++ b/src/MainLayer.cc
@@ -62,9 +62,9 @@ MainLayer::~MainLayer()
 }
 
 
-void MainLayer::pushed(Mf::Engine& e)
+void MainLayer::pushed(Mf::Engine& engine)
 {
-	engine = &e;
+	mEngine = &engine;
 
 	//Mf::Scalar coeff[] = {0.0, 1.0};
 	//Mf::Lerp interp(coeff, 0.25);
@@ -74,7 +74,7 @@ void MainLayer::pushed(Mf::Engine& e)
 		//Mf::Transition<Mf::Lerp>::alloc(gameLayer, Mf::LayerP(), interp);
 	//engine->push(transition);
 	//engine->push(GameLayer::alloc());
-	engine->push(TitleLayer::alloc());
+	mEngine->push(TitleLayer::alloc());
 }
 
 
@@ -100,17 +100,17 @@ bool MainLayer::handleEvent(const Mf::Event& event)
 			}
 			else if (event.key.keysym.sym == SDLK_f)
 			{
-				engine->getVideo().toggleFull();
+				mEngine->getVideo().toggleFull();
 			}
 			else if (event.key.keysym.sym == SDLK_l)
 			{
-				Mf::Video& video = engine->getVideo();
+				Mf::Video& video = mEngine->getVideo();
 				video.toggleCursorGrab();
 				video.toggleCursorVisible();
 			}
 			else if (event.key.keysym.sym == SDLK_y)
 			{
-				engine->push(GameLayer::alloc());
+				mEngine->push(GameLayer::alloc());
 			}
 			break;
 
@@ -133,7 +133,7 @@ void MainLayer::quit()
 	// the operating system will take care of cleaning up
 	exit(0);
 #else
-	engine->clear();
+	mEngine->clear();
 #endif
 }
 
@@ -172,7 +172,8 @@ void MainLayer::contextRecreated(const Mf::Notification* note)
 
 void printUsage()
 {
-	std::cout << "Usage: "PACKAGE" [-h|--help] [-i|--info] [OPTION=VALUE]..." << std::endl
+	std::cout << "Usage: "PACKAGE" [-h|--help] [-i|--info] [OPTION=VALUE]..."
+			  << std::endl
 			  << "The alien-smashing action game." << std::endl
 			  << std::endl
 			  << "Options:" << std::endl
@@ -250,6 +251,8 @@ void goodbye()
 }
 
 
+typedef cml::matrix< Mf::Scalar, cml::fixed<5,5>,
+		cml::col_basis, cml::col_major >		Matrix5;
 
 int main(int argc, char* argv[])
 {
diff --git a/src/MainLayer.hh b/src/MainLayer.hh
index 44a0f23..9738583 100644
--- a/src/MainLayer.hh
+++ b/src/MainLayer.hh
@@ -47,8 +47,10 @@
 class MainLayer;
 typedef boost::shared_ptr<MainLayer> MainLayerP;
 
-struct MainLayer : public Mf::Layer
+class MainLayer : public Mf::Layer
 {
+public:
+
 	MainLayer();
 	~MainLayer();
 
@@ -72,7 +74,7 @@ private:
 	void setupGL();
 	void contextRecreated(const Mf::Notification* note);
 
-	Mf::Engine* engine;
+	Mf::Engine* mEngine;
 };
 
 
diff --git a/src/Makefile.am b/src/Makefile.am
index 7c4e61c..cecdac1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -47,7 +47,7 @@ libmoof_a_SOURCES = \
 					Moof/Rectangle.hh \
 					Moof/Resource.cc \
 					Moof/Resource.hh \
-					Moof/RK4.hh \
+					Moof/RigidBody.hh \
 					Moof/Script.hh \
 					Moof/Settings.cc \
 					Moof/Settings.hh \
diff --git a/src/Moof/Aabb.cc b/src/Moof/Aabb.cc
index df09cdd..17ce663 100644
--- a/src/Moof/Aabb.cc
+++ b/src/Moof/Aabb.cc
@@ -45,28 +45,35 @@ void Aabb::getOctant(Aabb& octant, int num) const
 			octant.init(Vector3(min[0], min[1], mid[2]),
 						Vector3(mid[0], mid[1], max[2]));
 			break;
+
 		case 1:
 			octant.init(Vector3(mid[0], min[1], mid[2]),
 						Vector3(max[0], mid[1], max[2]));
 			break;
+
 		case 2:
 			octant.init(mid, max);
 			break;
+
 		case 3:
 			octant.init(Vector3(min[0], mid[1], mid[2]),
 						Vector3(mid[0], max[1], max[2]));
 			break;
+
 		case 4:
 			octant.init(min, mid);
 			break;
+
 		case 5:
 			octant.init(Vector3(mid[0], min[1], min[2]),
 						Vector3(max[0], mid[1], mid[2]));
 			break;
+
 		case 6:
 			octant.init(Vector3(mid[0], mid[1], min[2]),
 						Vector3(max[0], max[1], mid[2]));
 			break;
+
 		case 7:
 			octant.init(Vector3(min[0], mid[1], min[2]),
 						Vector3(mid[0], max[1], mid[2]));
diff --git a/src/Moof/Aabb.hh b/src/Moof/Aabb.hh
index 0f7bbb9..6a7e064 100644
--- a/src/Moof/Aabb.hh
+++ b/src/Moof/Aabb.hh
@@ -47,7 +47,6 @@ struct Aabb : public Cullable, public Drawable
 	Vector3 min;
 	Vector3 max;
 
-
 	Aabb() {}
 
 	Aabb(const Vector3& a, const Vector3& b)
diff --git a/src/Moof/Camera.cc b/src/Moof/Camera.cc
index 6b6cfa1..8f313b7 100644
--- a/src/Moof/Camera.cc
+++ b/src/Moof/Camera.cc
@@ -33,148 +33,134 @@
 namespace Mf {
 
 
-void Camera::setPosition(const Vector3& point)
+void Camera::setPosition(const Vector3& position)
 {
-	position_ = point;
-	calculateSecondary();
-	//Vector3 coeff[2] = {position_, point};
-	//pInterp_.init(coeff, 0.1);
+	mState.position = position;
 }
+
 void Camera::setRotation(const Quaternion& rotation)
 {
-	rotation_ = rotation;
+	mState.orientation = rotation;
+}
+
+void Camera::lookAt(const Vector3& point)
+{
+	// FIXME this doesn't work as expected
+	cml::quaternion_rotation_aim_at(mState.orientation, mState.position, point,
+			Vector3(0.0, 1.0, 0.0));
 }
 
 
 void Camera::setProjection(const Matrix4& projection)
 {
-	projection_ = projection;
+	mProjection = projection;
 }
 
 void Camera::setProjection(Scalar fovy, Scalar aspect, Scalar abutting,
 		Scalar distant)
 {
-	cml::matrix_perspective_yfov_RH(projection_, fovy, aspect, abutting,
+	cml::matrix_perspective_yfov_RH(mProjection, fovy, aspect, abutting,
 			distant, cml::z_clip_neg_one);
-	calculateSecondary();
 }
 
 
-void Camera::uploadToGL() const
+void Camera::uploadToGL(Scalar alpha) const
 {
+	calculate(alpha);
+
 	glMatrixMode(GL_PROJECTION);
-	glMultMatrix(projection_.data());
+	glMultMatrix(mProjection.data());
 
 	glMatrixMode(GL_MODELVIEW);
-	glMultMatrix(modelview_.data());
+	glMultMatrix(mModelview.data());
 }
 
-void Camera::update(Scalar t, Scalar dt)
+void Camera::calculate(Scalar alpha) const
 {
-	//pInterp_.update(dt);
-	//position_ = pInterp_.getState(0.0);
+	State3 state = getState(alpha);
 
-	//calculateSecondary();
+	cml::matrix_rotation_quaternion(mModelview, state.orientation);
+
+	Matrix4 translate;
+	cml::matrix_translation(translate, state.position);
+
+	mModelview *= translate;
+
+	mFrustum.init(mModelview, mProjection);
 }
 
 
-void Camera::lookAt(const Vector3& point)
+void Camera::update(Scalar t, Scalar dt)
+{
+	RigidBody3::update(t, dt);
+}
+
+void Camera::draw(Scalar alpha) const
 {
-	cml::quaternion_rotation_aim_at(rotation_, position_, point,
-			Vector3(0.0, -1.0, 0.0));
-	calculateSecondary();
+	mSphere.draw(alpha);
 }
 
+
 void Camera::handleEvent(const Event& event)
 {
+	const Scalar ds = 50.0;
+
 	switch (event.type)
 	{
 		case SDL_KEYDOWN:
 			if (event.key.keysym.sym == SDLK_RIGHT)
 			{
-				Vector3 vec = position_;
-				vec[0] -= 50.0;
-				setPosition(vec);
+				mState.position[0] -= ds;
 			}
 			else if (event.key.keysym.sym == SDLK_LEFT)
 			{
-				Vector3 vec = position_;
-				vec[0] += 50.0;
-				setPosition(vec);
+				mState.position[0] += ds;
 			}
 			else if (event.key.keysym.sym == SDLK_UP)
 			{
-				Vector3 vec = position_;
-				vec[1] -= 50.0;
-				setPosition(vec);
+				mState.position[1] -= ds;
 			}
 			else if (event.key.keysym.sym == SDLK_DOWN)
 			{
-				Vector3 vec = position_;
-				vec[1] += 50.0;
-				setPosition(vec);
+				mState.position[1] += ds;
 			}
 			else if (event.key.keysym.sym == SDLK_PAGEUP)
 			{
-				Vector3 vec = position_;
-				vec[2] += 50.0;
-				setPosition(vec);
+				mState.position[2] += ds;
 			}
 			else if (event.key.keysym.sym == SDLK_PAGEDOWN)
 			{
-				Vector3 vec = position_;
-				vec[2] -= 50.0;
-				setPosition(vec);
+				mState.position[2] -= ds;
 			}
 			break;
 
 		case SDL_MOUSEMOTION:
 			{
-			Scalar xrel = cml::rad(Scalar(event.motion.xrel) / 5.0);
-			Scalar yrel = cml::rad(Scalar(event.motion.yrel) / 5.0);
+				Scalar xrel = cml::rad(Scalar(event.motion.xrel) / 6.0);
+				Scalar yrel = cml::rad(Scalar(event.motion.yrel) / 6.0);
 
-			Quaternion rotation = rotation_;
+				Quaternion rotation = mState.orientation;
 
-			cml::quaternion_rotate_about_world_x(rotation, yrel);
-			//rotation_.normalize();
-			cml::quaternion_rotate_about_world_y(rotation, xrel);
-			rotation.normalize();
+				cml::quaternion_rotate_about_world_x(rotation, yrel);
+				//mRotation.normalize();
+				cml::quaternion_rotate_about_world_y(rotation, xrel);
 
-			setRotation(rotation);
-			break;
+				rotation.normalize();
+				mState.orientation = rotation;
 			}
+			break;
 
 		case SDL_MOUSEBUTTONDOWN:
 			if (event.button.button == SDL_BUTTON_WHEELUP)
 			{
-				Vector3 vec = position_;
-				vec[2] += 50.0;
-				setPosition(vec);
+				mState.position[2] -= ds;
 			}
 			else if (event.button.button == SDL_BUTTON_WHEELDOWN)
 			{
-				Vector3 vec = position_;
-				vec[2] -= 50.0;
-				setPosition(vec);
+				mState.position[2] -= ds;
 			}
 			break;
 	}
-
-	calculateSecondary();
-}
-
-void Camera::calculateSecondary()
-{
-	cml::matrix_rotation_quaternion(modelview_, rotation_);
-
-	Matrix4 translate;
-	cml::matrix_translation(translate, position_);
-
-	//modelview_.transpose();
-	modelview_ *= translate;
-	//modelview_ = translate * modelview_;
-
-	frustum_.init(modelview_, projection_);
 }
 
 
diff --git a/src/Moof/Camera.hh b/src/Moof/Camera.hh
index 827c47f..8e28f54 100644
--- a/src/Moof/Camera.hh
+++ b/src/Moof/Camera.hh
@@ -31,57 +31,63 @@
 
 #include <Moof/Event.hh>
 #include <Moof/Frustum.hh>
-#include <Moof/Interpolator.hh>
 #include <Moof/Math.hh>
+#include <Moof/RigidBody.hh>
 
 
 namespace Mf {
 
 
-class Camera
+class Camera : public RigidBody3
 {
-	void calculateSecondary();
-
 public:
-	Camera() :
-		position_(0.0, 0.0, 0.0)
+
+	Camera()
 	{
-		cml::quaternion_rotation_world_y(rotation_, SCALAR(0.0));
-		calculateSecondary();
+		mState.init();
+		mPrevState.init();
+
+		cml::quaternion_rotation_world_y(mState.orientation, SCALAR(0.0));
 	}
 
-	void setPosition(const Vector3& point);
+	void setPosition(const Vector3& position);
 	void setRotation(const Quaternion& rotation);
 
+	void lookAt(const Vector3& point);
+
 	void setProjection(const Matrix4& projection);
 	void setProjection(Scalar fovy, Scalar aspect, Scalar near, Scalar far);
 
-	void uploadToGL() const;
-
-	void lookAt(const Vector3& point);
+	const Matrix4& getModelview() const
+	{
+		return mModelview;
+	}
 
-	const Matrix4& getModelviewMatrix() const
+	const Matrix4& getProjection() const
 	{
-		return modelview_;
+		return mProjection;
 	}
 
 	const Frustum& getFrustum() const
 	{
-		return frustum_;
+		return mFrustum;
 	}
 
-	void handleEvent(const Event& event);
+
+	void uploadToGL(Scalar alpha = 0) const;
+
 	void update(Scalar t, Scalar dt);
+	void draw(Scalar alpha = 0) const;
+	void handleEvent(const Event& event);
 
 private:
-	Vector3 	position_;
-	Quaternion	rotation_;
-	Matrix4		projection_;
 
-	Matrix4 	modelview_;
-	Frustum		frustum_;
+	void calculate(Scalar alpha) const;
+
+	mutable Matrix4 	mModelview;
+	Matrix4				mProjection;
 
-	Lerp3		pInterp_;
+	mutable Frustum		mFrustum;
 };
 
 
diff --git a/src/Moof/Dispatcher.cc b/src/Moof/Dispatcher.cc
index 369d451..3207464 100644
--- a/src/Moof/Dispatcher.cc
+++ b/src/Moof/Dispatcher.cc
@@ -34,15 +34,17 @@
 namespace Mf {
 
 
-struct Dispatcher::Impl
+class Dispatcher::Impl
 {
+	friend class Dispatcher;
+
 	Impl() :
-		id(1) {}
+		mId(1) {}
 
 	Dispatcher::Handler getNewHandler()
 	{
-		id += 2;
-		return (Dispatcher::Handler)id;
+		mId += 2;
+		return (Dispatcher::Handler)mId;
 	}
 
 	typedef std::pair<Dispatcher::Handler,Dispatcher::Function>	Callback;
@@ -56,43 +58,56 @@ struct Dispatcher::Impl
 	inline Handler addHandler(const std::string& message,
 			const Function& callback, Handler id)
 	{
-		callbacks.insert(std::make_pair(message, std::make_pair(id, callback)));
-		handlers.insert(std::make_pair(id, message));
+		mCallbacks.insert(std::make_pair(message, std::make_pair(id, callback)));
+		mHandlers.insert(std::make_pair(id, message));
 
 		return id;
 	}
 
 	inline void removeHandler(Handler id)
 	{
-		std::pair<HandlerIter,HandlerIter> matching(handlers.equal_range(id));
+		std::pair<HandlerIter,HandlerIter> matching(mHandlers.equal_range(id));
 
 		for (HandlerIter it = matching.first; it != matching.second; ++it)
 		{
-			CallbackIter first = callbacks.find((*it).second);
-			CallbackIter last = callbacks.end();
+			CallbackIter first = mCallbacks.find((*it).second);
+			CallbackIter last = mCallbacks.end();
 
 			for (CallbackIter jt = first; jt != last; ++jt)
 			{
 				if ((*jt).second.first == id)
 				{
-					callbacks.erase(jt);
+					mCallbacks.erase(jt);
 					break;
 				}
 			}
 		}
 
-		handlers.erase(id);
+		mHandlers.erase(id);
+	}
+
+	void dispatch(const std::string& message, const Notification* param)
+	{
+		std::pair<CallbackIter,CallbackIter>
+			callbacks(mCallbacks.equal_range(message));
+
+		for (CallbackIter it = callbacks.first; it != callbacks.second; ++it)
+		{
+			Function callback = (*it).second.second;
+			callback(param);
+		}
 	}
 
-	unsigned long	id;
 
-	CallbackLookup	callbacks;
-	HandlerLookup	handlers;
+	unsigned long	mId;
+
+	CallbackLookup	mCallbacks;
+	HandlerLookup	mHandlers;
 };
 
 
 Dispatcher::Dispatcher() :
-	impl_(new Dispatcher::Impl) {}
+	mImpl(new Dispatcher::Impl) {}
 
 Dispatcher::~Dispatcher() {}
 
@@ -107,34 +122,28 @@ Dispatcher& Dispatcher::getInstance()
 Dispatcher::Handler Dispatcher::addHandler(const std::string& message,
 		const Function& callback)
 {
-	return addHandler(message, callback, impl_->getNewHandler());
+	return addHandler(message, callback, mImpl->getNewHandler());
 }
 
 Dispatcher::Handler Dispatcher::addHandler(const std::string& message,
 		const Function& callback, Handler id)
 {
 	// pass through
-	return impl_->addHandler(message, callback, id);
+	return mImpl->addHandler(message, callback, id);
 }
 
 
 void Dispatcher::removeHandler(Handler id)
 {
 	// pass through
-	return impl_->removeHandler(id);
+	return mImpl->removeHandler(id);
 }
 
 
 void Dispatcher::dispatch(const std::string& message, const Notification* param)
 {
-	std::pair<Impl::CallbackIter,Impl::CallbackIter>
-		callbacks(impl_->callbacks.equal_range(message));
-
-	for (Impl::CallbackIter it = callbacks.first; it != callbacks.second; ++it)
-	{
-		Function callback = (*it).second.second;
-		callback(param);
-	}
+	// pass through
+	mImpl->dispatch(message, param);
 }
 
 
diff --git a/src/Moof/Dispatcher.hh b/src/Moof/Dispatcher.hh
index bbce878..7945752 100644
--- a/src/Moof/Dispatcher.hh
+++ b/src/Moof/Dispatcher.hh
@@ -57,7 +57,7 @@ public:
 class Dispatcher
 {
 	class Impl;
-	boost::shared_ptr<Impl> impl_;
+	boost::shared_ptr<Impl> mImpl;
 
 public:
 
@@ -107,7 +107,7 @@ inline void dispatch(const std::string& message, const Notification* param = 0)
 	Dispatcher::getInstance().dispatch(message, param);
 }
 
-} // namespace dispatch
+} // namespace dispatcher
 
 
 } // namespace Mf
diff --git a/src/Moof/Engine.cc b/src/Moof/Engine.cc
index 16da8d4..ccf2347 100644
--- a/src/Moof/Engine.cc
+++ b/src/Moof/Engine.cc
@@ -51,12 +51,13 @@ namespace Mf {
 class Engine::Impl
 {
 public:
+
 	Impl(int argc, char* argv[], const std::string& name,
 			const std::string& iconFile, const std::string& configFile,
 			Engine& engine) :
-		interface(engine),
-		timestep(0.01),
-		printFps(false)
+		mInterface(engine),
+		mTimestep(0.01),
+		mPrintFps(false)
 	{
 #if defined(_WIN32) || defined (_WIN64) || defined(__WIN32__)
 		if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) != 0)
@@ -82,24 +83,24 @@ public:
 		if (settings.get("rngseed", randomSeed)) setSeed(randomSeed);
 		else setSeed();
 
-		Scalar timeStep = 80.0;
-		settings.get("timestep", timeStep);
-		timestep = 1.0 / timeStep;
+		Scalar timestep = 80.0;
+		settings.get("timestep", timestep);
+		mTimestep = 1.0 / timestep;
 
 		Scalar maxFps = 40.0;
 		settings.get("maxfps", maxFps);
-		drawRate = 1.0 / maxFps;
+		mDrawRate = 1.0 / maxFps;
 
-		settings.get("printfps", printFps);
+		settings.get("printfps", mPrintFps);
 
-		video = Video::alloc(name, iconFile);
-		video->makeActive();
+		mVideo = Video::alloc(name, iconFile);
+		mVideo->makeActive();
 	}
 
 	~Impl()
 	{
 		// the video object must be destroyed before we can shutdown SDL
-		video.reset();
+		mVideo.reset();
 
 		alutExit();
 		FE_Quit();
@@ -124,9 +125,9 @@ public:
 
 		Scalar totalTime = 0.0;
 		Scalar deltaTime = 0.0;
-		Scalar accumulator = timestep;
+		Scalar accumulator = mTimestep;
 
-		fps = 0;
+		mFps = 0;
 		int frameAccum = 0;
 
 		do
@@ -140,19 +141,19 @@ public:
 
 			Timer::fireIfExpired(ticksNow);
 
-			while (accumulator >= timestep)
+			while (accumulator >= mTimestep)
 			{
 				dispatchEvents();
-				update(totalTime, timestep);
+				update(totalTime, mTimestep);
 
-				totalTime += timestep;
-				accumulator -= timestep;
+				totalTime += mTimestep;
+				accumulator -= mTimestep;
 
-				nextStep += timestep;
+				nextStep += mTimestep;
 			}
 			if (ticksNow >= nextStep)
 			{
-				nextStep = ticksNow + timestep;
+				nextStep = ticksNow + mTimestep;
 			}
 
 			if (ticksNow >= nextDraw)
@@ -161,7 +162,7 @@ public:
 
 				if (ticksNow >= nextFpsUpdate) // determine the actual fps
 				{
-					fps = frameAccum;
+					mFps = frameAccum;
 					frameAccum = 0;
 
 					nextFpsUpdate += 1.0;
@@ -170,20 +171,20 @@ public:
 						nextFpsUpdate = ticksNow + 1.0;
 					}
 
-					if (printFps)
+					if (mPrintFps)
 					{
-						logInfo("%d fps", fps);
+						logInfo("%d fps", mFps);
 					}
 				}
 
-				draw(accumulator / timestep);
-				video->swap();
+				draw(accumulator / mTimestep);
+				mVideo->swap();
 
-				nextDraw += drawRate;
+				nextDraw += mDrawRate;
 				if (ticksNow >= nextDraw)
 				{
 					// we missed some scheduled draws, so reset the schedule
-					nextDraw = ticksNow + drawRate;
+					nextDraw = ticksNow + mDrawRate;
 				}
 			}
 
@@ -191,7 +192,7 @@ public:
 			Timer::sleep(std::min(std::min(nextStep, nextDraw),
 						Timer::getNextFire()), true);
 		}
-		while (!stack.empty());
+		while (!mStack.empty());
 	}
 
 	void dispatchEvents()
@@ -212,7 +213,7 @@ public:
 					break;
 
 				case SDL_VIDEORESIZE:
-					video->resize(event.resize.w, event.resize.h);
+					mVideo->resize(event.resize.w, event.resize.h);
 					break;
 			}
 
@@ -223,9 +224,9 @@ public:
 
 	void update(Scalar t, Scalar dt)
 	{
-		for (stackIt = stack.begin(); stackIt != stack.end(); ++stackIt)
+		for (mStackIt = mStack.begin(); mStackIt != mStack.end(); ++mStackIt)
 		{
-			(*stackIt)->update(t, dt);
+			(*mStackIt)->update(t, dt);
 		}
 	}
 
@@ -233,7 +234,7 @@ public:
 	{
 		// FIXME - this will crash if the layer being drawn pops itself
 		std::list<LayerP>::reverse_iterator it;
-		for (it = stack.rbegin(); it != stack.rend(); ++it)
+		for (it = mStack.rbegin(); it != mStack.rend(); ++it)
 		{
 			(*it)->draw(alpha);
 		}
@@ -241,9 +242,9 @@ public:
 
 	void handleEvent(const Event& event)
 	{
-		for (stackIt = stack.begin(); stackIt != stack.end(); ++stackIt)
+		for (mStackIt = mStack.begin(); mStackIt != mStack.end(); ++mStackIt)
 		{
-			if ((*stackIt)->handleEvent(event)) break;
+			if ((*mStackIt)->handleEvent(event)) break;
 		}
 	}
 
@@ -251,22 +252,22 @@ public:
 	void push(LayerP layer)
 	{
 		ASSERT(layer && "cannot push null layer");
-		stack.push_front(layer);
-		logInfo(" push: %d", stack.size());
-		layer->pushed(interface);
+		mStack.push_front(layer);
+		logInfo(" push: %d", mStack.size());
+		layer->pushed(mInterface);
 	}
 
 	LayerP pop()
 	{
 		bool fixIt = false;
-		if (stack.begin() == stackIt) fixIt = true;
+		if (mStack.begin() == mStackIt) fixIt = true;
 
-		LayerP popped = stack.front();
-		stack.pop_front();
-		logInfo("  pop: %d", stack.size());
-		popped->popped(interface);
+		LayerP popped = mStack.front();
+		mStack.pop_front();
+		logInfo("  pop: %d", mStack.size());
+		popped->popped(mInterface);
 
-		if (fixIt) stackIt = --stack.begin();
+		if (fixIt) mStackIt = --mStack.begin();
 
 		return popped;
 	}
@@ -278,23 +279,23 @@ public:
 		std::list<LayerP> popped;
 
 		std::list<LayerP>::iterator it;
-		for (it = stack.begin(); it != stack.end(); ++it)
+		for (it = mStack.begin(); it != mStack.end(); ++it)
 		{
 			popped.push_back(*it);
 
-			if (it == stackIt) fixIt = true;
+			if (it == mStackIt) fixIt = true;
 
 			if ((*it).get() == layer)
 			{
 				++it;
-				stack.erase(stack.begin(), it);
+				mStack.erase(mStack.begin(), it);
 
 				for (it = popped.begin(); it != popped.end(); ++it)
 				{
-					(*it)->popped(interface);
+					(*it)->popped(mInterface);
 				}
 
-				if (fixIt) stackIt = --stack.begin();
+				if (fixIt) mStackIt = --mStack.begin();
 
 				return popped.back();
 			}
@@ -305,24 +306,24 @@ public:
 
 	void clear()
 	{
-		stack.clear();
-		stackIt = stack.begin();
-		logInfo("clear: %d", stack.size());
+		mStack.clear();
+		mStackIt = mStack.begin();
+		logInfo("clear: %d", mStack.size());
 	}
 
 
-	Engine&				interface;
+	Engine&				mInterface;
 
-	VideoP				video;
+	VideoP				mVideo;
 
-	std::list<LayerP>			stack;
-	std::list<LayerP>::iterator	stackIt;
+	std::list<LayerP>			mStack;
+	std::list<LayerP>::iterator	mStackIt;
 
-	Scalar				timestep;
-	Scalar				drawRate;
+	Scalar				mTimestep;
+	Scalar				mDrawRate;
 
-	long				fps;
-	bool				printFps;
+	long				mFps;
+	bool				mPrintFps;
 };
 
 
@@ -330,7 +331,7 @@ static Engine* instance = 0;
 
 Engine::Engine(int argc, char* argv[], const std::string& name,
 		const std::string& iconFile, const std::string& configFile) :
-	impl_(new Engine::Impl(argc, argv, name, iconFile, configFile, *this))
+	mImpl(new Engine::Impl(argc, argv, name, iconFile, configFile, *this))
 {
 	instance = this;
 }
@@ -340,6 +341,7 @@ Engine& Engine::getInstance()
 {
 	ASSERT(instance && "dereferencing null pointer");
 	return *instance;
+	// TODO this has not been completely thought out
 	//static Engine engine;
 	//return engine;
 }
@@ -347,63 +349,63 @@ Engine& Engine::getInstance()
 
 void Engine::run()
 {
-	return impl_->run();
+	return mImpl->run();
 }
 
 void Engine::setTimestep(Scalar ts)
 {
-	impl_->timestep = ts;
+	mImpl->mTimestep = ts;
 }
 
 Scalar Engine::getTimestep() const
 {
-	return impl_->timestep;
+	return mImpl->mTimestep;
 }
 
 void Engine::setMaxFrameRate(long maxFps)
 {
-	impl_->drawRate = 1.0 / Scalar(maxFps);
+	mImpl->mDrawRate = 1.0 / Scalar(maxFps);
 }
 
 long Engine::getMaxFrameRate() const
 {
-	return long(1.0 / impl_->drawRate);
+	return long(1.0 / mImpl->mDrawRate);
 }
 
 
 Video& Engine::getVideo() const
 {
-	return *impl_->video;
+	return *mImpl->mVideo;
 }
 
 long Engine::getFrameRate() const
 {
-	return impl_->fps;
+	return mImpl->mFps;
 }
 
 
 void Engine::push(LayerP layer)
 {
 	// pass through
-	impl_->push(layer);
+	mImpl->push(layer);
 }
 
 LayerP Engine::pop()
 {
 	// pass through
-	return impl_->pop();
+	return mImpl->pop();
 }
 
 LayerP Engine::pop(Layer* layer)
 {
 	// pass through
-	return impl_->pop(layer);
+	return mImpl->pop(layer);
 }
 
 void Engine::clear()
 {
 	// pass through
-	impl_->clear();
+	mImpl->clear();
 }
 
 
diff --git a/src/Moof/Engine.hh b/src/Moof/Engine.hh
index e49f44d..e42510d 100644
--- a/src/Moof/Engine.hh
+++ b/src/Moof/Engine.hh
@@ -42,8 +42,13 @@ namespace Mf {
 // forward declarations
 class Video;
 
-struct Engine
+class Engine
 {
+	class Impl;
+	boost::shared_ptr<Impl> mImpl;
+
+public:
+
 	Engine(int argc, char* argv[], const std::string& name, 
 			const std::string& iconFile, const std::string& configFile);
 	~Engine() {}
@@ -77,10 +82,6 @@ struct Engine
 			throw *this;
 		}
 	};
-
-private:
-	class Impl;
-	boost::shared_ptr<Impl> impl_;
 };
 
 
diff --git a/src/Moof/Entity.hh b/src/Moof/Entity.hh
index dc60010..52cb79d 100644
--- a/src/Moof/Entity.hh
+++ b/src/Moof/Entity.hh
@@ -48,18 +48,39 @@ class Frustum;
 
 /**
  * Interface for game objects that can be drawn to the screen and have a
- * specified size.
+ * specified volume (take up space).
  */
 
 class Entity : public Cullable, public Drawable
 {
+protected:
+
+	Aabb	mAabb;
+	Sphere	mSphere;
+
 public:
+
 	virtual ~Entity() {}
 
 	virtual void drawIfVisible(Scalar alpha, const Frustum& frustum) const
 	{
 		if (isVisible(frustum)) draw(alpha);
 	}
+
+	virtual bool isVisible(const Frustum& frustum) const
+	{
+		return mSphere.isVisible(frustum) && mAabb.isVisible(frustum);
+	}
+
+	const Aabb& getAabb() const
+	{
+		return mAabb;
+	}
+
+	const Sphere& getSphere() const
+	{
+		return mSphere;
+	}
 };
 
 
diff --git a/src/Moof/Frustum.cc b/src/Moof/Frustum.cc
index 51705f2..86e4d5b 100644
--- a/src/Moof/Frustum.cc
+++ b/src/Moof/Frustum.cc
@@ -41,12 +41,12 @@ void Frustum::init(const Matrix4& modelview, const Matrix4& projection)
 	cml::extract_frustum_planes(modelview, projection, planes,
 			cml::z_clip_neg_one);
 
-	planes_[0] = Plane(planes[0][0], planes[0][1], planes[0][2], planes[0][3]);
-	planes_[1] = Plane(planes[1][0], planes[1][1], planes[1][2], planes[1][3]);
-	planes_[2] = Plane(planes[2][0], planes[2][1], planes[2][2], planes[2][3]);
-	planes_[3] = Plane(planes[3][0], planes[3][1], planes[3][2], planes[3][3]);
-	planes_[4] = Plane(planes[4][0], planes[4][1], planes[4][2], planes[4][3]);
-	planes_[5] = Plane(planes[5][0], planes[5][1], planes[5][2], planes[5][3]);
+	mPlanes[0] = Plane(planes[0][0], planes[0][1], planes[0][2], planes[0][3]);
+	mPlanes[1] = Plane(planes[1][0], planes[1][1], planes[1][2], planes[1][3]);
+	mPlanes[2] = Plane(planes[2][0], planes[2][1], planes[2][2], planes[2][3]);
+	mPlanes[3] = Plane(planes[3][0], planes[3][1], planes[3][2], planes[3][3]);
+	mPlanes[4] = Plane(planes[4][0], planes[4][1], planes[4][2], planes[4][3]);
+	mPlanes[5] = Plane(planes[5][0], planes[5][1], planes[5][2], planes[5][3]);
 }
 
 void Frustum::init(const Matrix4& modelview, Scalar fovy, Scalar aspect,
@@ -73,7 +73,7 @@ Frustum::Collision Frustum::contains(const Aabb& aabb) const
 
 		for (int j = 0; j < 8; ++j)
 		{
-			if (planes_[i].intersects(corners[j]) ==
+			if (mPlanes[i].intersects(corners[j]) ==
 					Plane::NEGATIVE)
 			{
 				--nInside;
@@ -93,7 +93,7 @@ Frustum::Collision Frustum::contains(const Sphere& sphere) const
 {
 	for (int i = 0; i < 6; ++i)
 	{
-		Plane::Halfspace halfspace = planes_[i].intersects(sphere);
+		Plane::Halfspace halfspace = mPlanes[i].intersects(sphere);
 		
 		if (halfspace == Plane::NEGATIVE)       return OUTSIDE;
 		else if (halfspace == Plane::INTERSECT) return INTERSECT;
diff --git a/src/Moof/Frustum.hh b/src/Moof/Frustum.hh
index 87e654f..c708c06 100644
--- a/src/Moof/Frustum.hh
+++ b/src/Moof/Frustum.hh
@@ -41,7 +41,7 @@ class Sphere;
 
 class Frustum
 {
-	Plane	planes_[6]; // left, right, bottom, top, near, far
+	Plane	mPlanes[6]; // left, right, bottom, top, near, far
 
 public:
 	typedef enum
diff --git a/src/Moof/Interpolator.hh b/src/Moof/Interpolator.hh
index 4de3f69..7ad38fe 100644
--- a/src/Moof/Interpolator.hh
+++ b/src/Moof/Interpolator.hh
@@ -44,41 +44,42 @@ class Interpolator
 	{
 		if (value > 1.0)
 		{
-			switch (mode_)
+			switch (mMode)
 			{
 				case STOP:
 					value = 1.0;
-					done_ = true;
+					mDone = true;
 					break;
 				case REPEAT:
 					value -= 1.0;
 					break;
 				case OSCILLATE:
 					value = 2.0 - value;
-					scale_ *= -1.0;
+					mScale *= -1.0;
 					break;
 			}
 		}
 		else if (value < 0.0)
 		{
-			switch (mode_)
+			switch (mMode)
 			{
 				case STOP:
 					value = 0.0;
-					done_ = true;
+					mDone = true;
 					break;
 				case REPEAT:
 					value += 1.0;
 					break;
 				case OSCILLATE:
 					value = -value;
-					scale_ *= -1.0;
+					mScale *= -1.0;
 					break;
 			}
 		}
 	}
 
 public:
+
 	typedef enum
 	{
 		STOP		= 0,
@@ -88,77 +89,79 @@ public:
 
 	void init(Scalar seconds = 1.0, Mode mode = STOP)
 	{
-		scale_ = 1.0 / seconds;
-		alpha_ = 0.0;
+		mScale = 1.0 / seconds;
+		mAlpha = 0.0;
 		setMode(mode);
 	}
 
 
 	void setMode(Mode mode)
 	{
-		mode_ = mode;
-		done_ = false;
+		mMode = mode;
+		mDone = false;
 	}
 
 
 	void update(Scalar t, Scalar dt)
 	{
-		if (!done_)
+		if (!mDone)
 		{
-			alpha_ += dt * scale_;
-			clamp(alpha_);
-			calculate(alpha_);
+			mAlpha += dt * mScale;
+			clamp(mAlpha);
+			calculate(mAlpha);
 		}
 	}
 
 	bool isDone() const
 	{
-		return done_;
+		return mDone;
 	}
 
 	virtual void calculate(Scalar alpha) = 0;
 
 private:
 
-	Scalar	alpha_;
-	Mode	mode_;
-	Scalar	scale_;
-	bool	done_;
+	Scalar	mAlpha;
+	Mode	mMode;
+	Scalar	mScale;
+	bool	mDone;
 };
 
 template <class T = Scalar>
 class InterpolatorBase : public Interpolator
 {
 public:
+
 	void init(Scalar seconds = 1.0, Mode mode = STOP)
 	{
 		Interpolator::init(seconds, mode);
 
 		calculate(0.0);	// set value
-		previous_ = value_;
+		mPrevious = mValue;
 	}
 
 	void calculate(Scalar alpha)
 	{
-		previous_ = value_;
-		calculate(value_, alpha);
+		mPrevious = mValue;
+		calculate(mValue, alpha);
 	}
 
 	virtual void calculate(T& value, Scalar alpha) = 0;
 
 	const T& getValue() const
 	{
-		return value_;
+		return mValue;
 	}
 
 	const T getState(Scalar alpha) const
 	{
-		return cml::lerp(previous_, value_, alpha);
+		return cml::lerp(mPrevious, mValue, alpha);
 	}
 
 private:
-	T value_;
-	T previous_;
+
+	T mValue;
+	T mPrevious;
 };
 
 
@@ -166,6 +169,7 @@ template <int D, class T = Scalar>
 class PolynomialInterpolator : public InterpolatorBase<T>
 {
 public:
+
 	PolynomialInterpolator() {}
 
 	PolynomialInterpolator(const T coefficients[D+1],
@@ -192,7 +196,7 @@ public:
 		for (int i = 0; i <= D; ++i)
 		{
 			// n! / (k! * (n - k)!)
-			coefficients_[i] = coefficients[i] * fac[D] / (fac[i] * fac[D - i]);
+			mCoefficients[i] = coefficients[i] * fac[D] / (fac[i] * fac[D - i]);
 		}
 
 		InterpolatorBase<T>::init(seconds, mode);
@@ -203,17 +207,18 @@ public:
 	{
 		Scalar beta = 1.0 - alpha;
 
-		value = coefficients_[0] * std::pow(beta, D);
+		value = mCoefficients[0] * std::pow(beta, D);
 
 		for (int i = 1; i <= D; ++i)
 		{
-			value += coefficients_[i] * std::pow(beta, D - i) *
+			value += mCoefficients[i] * std::pow(beta, D - i) *
 				std::pow(alpha, i);
 		}
 	}
 
 private:
-	T coefficients_[D+1];
+
+	T mCoefficients[D+1];
 };
 
 
@@ -223,6 +228,7 @@ template <class T>
 class PolynomialInterpolator<1,T> : public InterpolatorBase<T>
 {
 public:
+
 	PolynomialInterpolator() {}
 
 	PolynomialInterpolator(const T coefficients[2], Scalar seconds = 1.0,
@@ -235,8 +241,8 @@ public:
 	void init(const T coefficients[2], Scalar seconds = 1.0,
 			Interpolator::Mode mode = Interpolator::STOP)
 	{
-		a_ = coefficients[0];
-		b_ = coefficients[1];
+		mA = coefficients[0];
+		mB = coefficients[1];
 
 		InterpolatorBase<T>::init(seconds, mode);
 	}
@@ -244,12 +250,13 @@ public:
 
 	void calculate(T& value, Scalar alpha)
 	{
-		value = cml::lerp(a_, b_, alpha);
+		value = cml::lerp(mA, mB, alpha);
 	}
 
 private:
-	T a_;
-	T b_;
+
+	T mA;
+	T mB;
 };
 
 
diff --git a/src/Moof/Layer.hh b/src/Moof/Layer.hh
index 8ec678d..55e233e 100644
--- a/src/Moof/Layer.hh
+++ b/src/Moof/Layer.hh
@@ -43,8 +43,10 @@ namespace Mf {
 class Engine;
 
 
-struct Layer : public Drawable
+class Layer : public Drawable
 {
+public:
+
 	virtual ~Layer() {}
 
 	virtual void pushed(Engine& engine) {}
diff --git a/src/Moof/Math.hh b/src/Moof/Math.hh
index 6665a19..c63cfe7 100644
--- a/src/Moof/Math.hh
+++ b/src/Moof/Math.hh
@@ -84,7 +84,7 @@ inline Vector3 promote(const Vector2& vec, Scalar extra = 1.0)
 
 
 
-const Scalar EPSILON = 0.000001;
+const Scalar EPSILON = SCALAR(0.000001);
 
 /**
  * Check the equality of scalars with a certain degree of error allowed.
@@ -96,6 +96,65 @@ inline bool isEqual(Scalar a, Scalar b, Scalar epsilon = EPSILON)
 }
 
 
+
+// Here are some generic implementations of a few simple integrators.  To use,
+// you need one type representing the state and another containing the
+// derivatives of the primary state variables.  The state class must implement
+// these methods:
+//
+// void getDerivative(Derivative_Type& derivative, Scalar absoluteTime);
+// void step(const Derivative_Type& derivative, Scalar deltaTime);
+//
+// Additionally, the derivative class must overload a few operators:
+//
+// Derivative_Type operator+(const Derivative_Type& other) const
+// Derivative_Type operator*(const Derivative_Type& other) const
+
+template<typename S, typename D>
+inline D evaluate(const S& state, Scalar t)
+{
+	D derivative;
+	state.getDerivative(derivative, t);
+	return derivative;
+}
+
+template<typename S, typename D>
+inline D evaluate(S state,  Scalar t, Scalar dt, const D& derivative)
+{
+	state.step(derivative, dt);
+	return evaluate<S,D>(state, t + dt);
+}
+
+
+template<typename S, typename D>
+inline void euler(S& state, Scalar t, Scalar dt)
+{
+	D a = evaluate<S,D>(state, t);
+
+	state.step(a, dt);
+}
+
+template<typename S, typename D>
+inline void rk2(S& state, Scalar t, Scalar dt)
+{
+	D a = evaluate<S,D>(state, t);
+	D b = evaluate<S,D>(state, t, dt * SCALAR(0.5), a);
+
+	state.step(b, dt);
+}
+
+template<typename S, typename D>
+inline void rk4(S& state, Scalar t, Scalar dt)
+{
+	D a = evaluate<S,D>(state, t);
+	D b = evaluate<S,D>(state, t, dt * SCALAR(0.5), a);
+	D c = evaluate<S,D>(state, t, dt * SCALAR(0.5), b);
+	D d = evaluate<S,D>(state, t, dt, c);
+
+	state.step((a + (b + c) * SCALAR(2.0) + d) * SCALAR(1.0/6.0), dt);
+}
+
+
 } // namespace Mf
 
 #endif // _MOOF_MATH_HH_
diff --git a/src/Moof/Mippleton.hh b/src/Moof/Mippleton.hh
index 7ad1782..a27a6c5 100644
--- a/src/Moof/Mippleton.hh
+++ b/src/Moof/Mippleton.hh
@@ -54,14 +54,14 @@ class Mippleton
 	typedef std::pair<unsigned,T*>							PtrValue;
 	typedef stlplus::hash<std::string,PtrValue,getHash>		PtrMap;
 
-	static PtrMap	ptrs_;
-	std::string		name_;
+	static PtrMap	mPtrMap;
+	std::string		mName;
 
 	static T* retain(const std::string& name)
 	{
-		typename PtrMap::iterator it = ptrs_.find(name);
+		typename PtrMap::iterator it = mPtrMap.find(name);
 
-		if (it != ptrs_.end())
+		if (it != mPtrMap.end())
 		{
 			++((*it).second.first);
 			return (*it).second.second;
@@ -69,35 +69,35 @@ class Mippleton
 		else
 		{
 			T* newObj = new T(name);
-			ptrs_.insert(std::make_pair(name, std::make_pair(1, newObj)));
+			mPtrMap.insert(std::make_pair(name, std::make_pair(1, newObj)));
 			return newObj; 
 		}
 	}
 
 	static void release(T* obj)
 	{
-		releaseByName(obj->name_);
+		releaseByName(obj->mName);
 	}
 
 	static void releaseByName(const std::string& name)
 	{
 		typename PtrMap::iterator it;
 
-		if ((it = ptrs_.find(name)) != ptrs_.end() && --(*it).second.first == 0)
+		if ((it = mPtrMap.find(name)) != mPtrMap.end() && --(*it).second.first == 0)
 		{
 			delete (*it).second.second;
-			ptrs_.erase((*it).first);
+			mPtrMap.erase((*it).first);
 		}
 	}
 
 public:
 
 	explicit Mippleton(const std::string& name) :
-		name_(name) {}
+		mName(name) {}
 
 	const std::string& getName() const
 	{
-		return name_;
+		return mName;
 	}
 
 	static boost::shared_ptr<T> getInstance(const std::string& name)
@@ -108,7 +108,7 @@ public:
 
 template <class T>
 stlplus::hash< std::string,std::pair<unsigned,T*>,getHash >
-	Mippleton<T>::ptrs_;
+	Mippleton<T>::mPtrMap;
 
 
 } // namespace Mf
diff --git a/src/Moof/Octree.hh b/src/Moof/Octree.hh
index 88dae7a..ca464a5 100644
--- a/src/Moof/Octree.hh
+++ b/src/Moof/Octree.hh
@@ -52,7 +52,6 @@ struct OctreeInsertable
 {
 	virtual ~OctreeInsertable() {}
 
-	virtual bool isInsideAabb(const Aabb& aabb) const = 0;
 	virtual int getOctant(const Aabb& aabb) const = 0;
 };
 
@@ -66,27 +65,16 @@ class Octree : public Entity
 	{
 		std::list<InsertableP> objects;
 
-		Aabb aabb;
-		Sphere sphere;
-
-		Node(const Aabb& box) :
-			aabb(box)
+		Node(const Aabb& aabb)
 		{
-			sphere.point = aabb.getCenter();
-			sphere.radius = (aabb.min - sphere.point).length();
+			mAabb = aabb;
+			mSphere.point = mAabb.getCenter();
+			mSphere.radius = (mAabb.min - mSphere.point).length();
 		}
 
 		void draw(Scalar alpha) const
 		{
-			aabb.draw(alpha);
-		}
-
-		void drawIfVisible(Scalar alpha, const Frustum& frustum) const
-		{
-			if (isVisible(frustum))
-			{
-				aabb.draw(alpha);
-			}
+			mAabb.draw(alpha);
 		}
 
 		void printSize()
@@ -110,17 +98,6 @@ class Octree : public Entity
 				if ((*it)->isVisible(frustum)) insertables.push_back(*it);
 			}
 		}
-
-
-		bool isVisible(const Frustum& frustum) const
-		{
-			if (sphere.isVisible(frustum))
-			{
-				return aabb.isVisible(frustum);
-			}
-
-			return false;
-		}
 	};
 
 
@@ -137,14 +114,22 @@ private:
 		ASSERT(node.valid() && "invalid node passed");
 		ASSERT(entity && "null entity passed");
 
-		if (entity->isInsideAabb(node->aabb))
+		Aabb entityAabb = entity->getAabb();
+		Aabb nodeAabb = node->getAabb();
+
+		if (!(entityAabb.max[0] < nodeAabb.max[0] &&
+			  entityAabb.min[0] > nodeAabb.min[0] &&
+			  entityAabb.max[1] < nodeAabb.max[1] &&
+			  entityAabb.min[1] > nodeAabb.min[1] &&
+			  entityAabb.max[2] < nodeAabb.max[2] &&
+			  entityAabb.min[2] > nodeAabb.min[2]))
 		{
-			return insert_recurse(entity, node);
+			node->objects.push_back(entity);
+			return node;
 		}
 		else
 		{
-			node->objects.push_back(entity);
-			return node;
+			return insert_recurse(entity, node);
 		}
 	}
 
@@ -153,7 +138,7 @@ private:
 		ASSERT(node.valid() && "invalid node passed");
 		ASSERT(entity && "null entity passed");
 
-		int octantNum = entity->getOctant(node->aabb);
+		int octantNum = entity->getOctant(node->getAabb());
 		if (octantNum == -1)
 		{
 			node->objects.push_back(entity);
@@ -161,12 +146,12 @@ private:
 		}
 		else
 		{
-			if ((int)tree_.children(node) <= octantNum)
+			if ((int)mTree.children(node) <= octantNum)
 			{
 				addChild(node, octantNum);
 			}
 
-			NodeP child = tree_.child(node, octantNum);
+			NodeP child = mTree.child(node, octantNum);
 			ASSERT(child.valid() && "expected valid child node");
 
 			return insert_recurse(entity, child);
@@ -179,10 +164,10 @@ private:
 
 		Aabb octant;
 
-		for (int i = tree_.children(node); i <= index; ++i)
+		for (int i = mTree.children(node); i <= index; ++i)
 		{
-			node->aabb.getOctant(octant, i);
-			tree_.append(node, octant);
+			node->getAabb().getOctant(octant, i);
+			mTree.append(node, octant);
 		}
 	}
 
@@ -194,14 +179,14 @@ private:
 
 		node->printSize();
 
-		int octantNum = entity.getOctant(node->aabb);
+		int octantNum = entity.getOctant(node->getAabb());
 		if (octantNum != -1)
 		{
 			node->getAll(insertables);
 
-			if (octantNum < (int)tree_.children(node))
+			if (octantNum < (int)mTree.children(node))
 			{
-				NodeP child = tree_.child(node, octantNum);
+				NodeP child = mTree.child(node, octantNum);
 				ASSERT(child.valid() && "expected valid child node");
 
 				getNearbyObjects(insertables, entity, child);
@@ -221,9 +206,9 @@ private:
 
 		node->getAll(insertables);
 
-		for (unsigned i = 0; i < tree_.children(node); ++i)
+		for (unsigned i = 0; i < mTree.children(node); ++i)
 		{
-			NodeP child = tree_.child(node, i);
+			NodeP child = mTree.child(node, i);
 			ASSERT(child.valid() && "expected valid child node");
 
 			getAll(insertables, child);
@@ -236,11 +221,11 @@ private:
 		ASSERT(node.valid() && "invalid node passed");
 
 		// try to cull by sphere
-		Frustum::Collision collision = frustum.contains(node->sphere);
+		Frustum::Collision collision = frustum.contains(node->getSphere());
 		if (collision == Frustum::OUTSIDE) return;
 
 		// try to cull by aabb
-		collision = frustum.contains(node->aabb);
+		collision = frustum.contains(node->getAabb());
 		if (collision == Frustum::OUTSIDE) return;
 
 
@@ -253,13 +238,13 @@ private:
 			node->getIfVisible(insertables, frustum);
 		}
 
-		if (tree_.children(node) > 0)
+		if (mTree.children(node) > 0)
 		{
 			if (collision == Frustum::INSIDE)
 			{
-				for (unsigned i = 0; i < tree_.children(node); ++i)
+				for (unsigned i = 0; i < mTree.children(node); ++i)
 				{
-					NodeP child = tree_.child(node, i);
+					NodeP child = mTree.child(node, i);
 					ASSERT(child.valid() && "expected valid child node");
 
 					getAll(insertables, child);
@@ -267,9 +252,9 @@ private:
 			}
 			else // collision == Frustum::INTERSECT
 			{
-				for (unsigned i = 0; i < tree_.children(node); ++i)
+				for (unsigned i = 0; i < mTree.children(node); ++i)
 				{
-					NodeP child = tree_.child(node, i);
+					NodeP child = mTree.child(node, i);
 					ASSERT(child.valid() && "expected valid child node");
 
 					getIfVisible(insertables, frustum, child);
@@ -279,7 +264,7 @@ private:
 	}
 
 
-	mutable stlplus::ntree<Node> tree_;
+	mutable stlplus::ntree<Node> mTree;
 
 
 public:
@@ -287,8 +272,8 @@ public:
 	void print(NodeP node)
 	{
 		logInfo("-----");
-		logInfo("depth to node: %d", tree_.depth(node));
-		logInfo("size of node: %d", tree_.size(node));
+		logInfo("depth to node: %d", mTree.depth(node));
+		logInfo("size of node: %d", mTree.size(node));
 	}
 
 	static Ptr alloc(const Node& rootNode)
@@ -298,13 +283,13 @@ public:
 
 	explicit Octree(const Node& rootNode)
 	{
-		tree_.insert(rootNode);
+		mTree.insert(rootNode);
 	}
 
 
 	NodeP insert(InsertableP entity)
 	{
-		return insert(entity, tree_.root());
+		return insert(entity, mTree.root());
 	}
 
 	void remove(InsertableP entity, NodeP node)
@@ -344,8 +329,8 @@ public:
 	void drawIfVisible(Scalar alpha, const Frustum& frustum) const
 	{
 		std::list<InsertableP> objects;
-		//getIfVisible(objects, frustum);
-		getNearbyObjects(objects, *savedObj);
+		getIfVisible(objects, frustum);
+		//getNearbyObjects(objects, *savedObj);
 
 		typename std::list<InsertableP>::const_iterator it;
 		for (it = objects.begin(); it != objects.end(); ++it)
@@ -357,13 +342,13 @@ public:
 
 	void getAll(std::list<InsertableP>& insertables) const
 	{
-		getAll(insertables, tree_.root());
+		getAll(insertables, mTree.root());
 	}
 
 	void getIfVisible(std::list<InsertableP>& insertables,
 			const Frustum& frustum) const
 	{
-		getIfVisible(insertables, frustum, tree_.root());
+		getIfVisible(insertables, frustum, mTree.root());
 	}
 
 	mutable const OctreeInsertable* savedObj;
@@ -373,7 +358,7 @@ public:
 			const OctreeInsertable& entity) const
 	{
 		logDebug("--- GETTING NEARBY");
-		getNearbyObjects(insertables, entity, tree_.root());
+		getNearbyObjects(insertables, entity, mTree.root());
 		logDebug("---");
 		savedObj = &entity;
 	}
diff --git a/src/Moof/RK4.hh b/src/Moof/RK4.hh
deleted file mode 100644
index 3293232..0000000
--- a/src/Moof/RK4.hh
+++ /dev/null
@@ -1,299 +0,0 @@
-
-/*******************************************************************************
-
- Copyright (c) 2009, Charles McGarvey
- All rights reserved.
- 
- Redistribution   and   use  in  source  and  binary  forms,  with  or  without
- modification, are permitted provided that the following conditions are met:
- 
-   * Redistributions  of  source  code  must retain the above copyright notice,
-     this list of conditions and the following disclaimer.
-   * Redistributions  in binary form must reproduce the above copyright notice,
-     this  list of conditions and the following disclaimer in the documentation
-     and/or other materials provided with the distribution.
- 
- THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES  (INCLUDING,  BUT  NOT  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- SERVICES;  LOSS  OF  USE,  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- OR  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-*******************************************************************************/
-
-#ifndef _MOOF_RK4_HH_
-#define _MOOF_RK4_HH_
-
-#include <vector>
-
-#include <boost/bind.hpp>
-#include <boost/function.hpp>
-
-#include <Moof/Math.hh>
-
-
-namespace Mf {
-
-
-// Generic implementations of a few simple integrators.  To use, you need one
-// type representing the state and another containing the derivatives of the
-// primary state variables.  The state class must implement these methods:
-//
-// void getDerivative(Derivative_Type& derivative, Scalar absoluteTime);
-// void step(const Derivative_Type& derivative, Scalar deltaTime);
-//
-// Additionally, the derivative class must overload a few operators:
-//
-// Derivative_Type operator+(const Derivative_Type& other) const
-// Derivative_Type operator*(const Derivative_Type& other) const
-
-template<typename S, typename D>
-inline D evaluate(const S& state, Scalar t)
-{
-	D derivative;
-	state.getDerivative(derivative, t);
-	return derivative;
-}
-
-template<typename S, typename D>
-inline D evaluate(S state,  Scalar t, Scalar dt, const D& derivative)
-{
-	state.step(derivative, dt);
-	return evaluate<S,D>(state, t + dt);
-}
-
-
-template<typename S, typename D>
-inline void euler(S& state, Scalar t, Scalar dt)
-{
-	D a = evaluate<S,D>(state, t);
-
-	state.step(a, dt);
-}
-
-template<typename S, typename D>
-inline void rk2(S& state, Scalar t, Scalar dt)
-{
-	D a = evaluate<S,D>(state, t);
-	D b = evaluate<S,D>(state, t, dt * SCALAR(0.5), a);
-
-	state.step(b, dt);
-}
-
-template<typename S, typename D>
-inline void rk4(S& state, Scalar t, Scalar dt)
-{
-	D a = evaluate<S,D>(state, t);
-	D b = evaluate<S,D>(state, t, dt * SCALAR(0.5), a);
-	D c = evaluate<S,D>(state, t, dt * SCALAR(0.5), b);
-	D d = evaluate<S,D>(state, t, dt, c);
-
-	state.step((a + (b + c) * SCALAR(2.0) + d) * SCALAR(1.0/6.0), dt);
-}
-
-
-//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-
-template <int D = 3>
-struct LinearState
-{
-	typedef cml::vector< Scalar, cml::fixed<D> >				Vector;
-	typedef boost::function<const Vector& (const LinearState&)>	ForceFunction;
-
-	// primary
-	
-	Vector		position;
-	Vector		momentum;
-
-	// secondary
-
-	Vector		velocity;
-
-	// user
-
-	Vector		force;
-	std::vector<ForceFunction> forces;
-
-	// constant
-	
-	Scalar		mass;
-	Scalar		inverseMass;
-
-
-	void recalculateLinear()
-	{
-		velocity = momentum * inverseMass;
-	}
-
-
-	struct GravityForce
-	{
-		explicit GravityForce(Scalar a = -9.8)
-		{
-			force.zero();
-			acceleration = a;
-		}
-
-		const Vector& operator () (const LinearState& state)
-		{
-			force[1] = state.mass * acceleration;
-			return force;
-		}
-
-	private:
-
-		Vector force;
-		Scalar acceleration;
-	};
-
-
-	void init()
-	{
-		position.zero();
-		momentum.zero();
-
-		velocity.zero();
-
-		force.zero();
-		forces.clear();
-
-		mass = SCALAR(1.0);
-		inverseMass = 1.0 / mass;
-	}
-
-
-	struct Derivative
-	{
-		Vector	velocity;
-		Vector	force;
-
-		Derivative operator*(Scalar dt) const
-		{
-			Derivative derivative;
-			derivative.velocity = dt * velocity;
-			derivative.force = dt * force;
-			return derivative;
-		}
-
-		Derivative operator+(const Derivative& other) const
-		{
-			Derivative derivative;
-			derivative.velocity = velocity + other.velocity;
-			derivative.force = force + other.force;
-			return derivative;
-		}
-	};
-
-
-	Vector getForce() const
-	{
-		Vector f(force);
-
-		for (size_t i = 0; i < forces.size(); ++i)
-		{
-			f += forces[i](*this);
-		}
-
-		return f;
-	}
-
-	void getDerivative(Derivative& derivative, Scalar t) const
-	{
-		derivative.velocity = velocity;
-		derivative.force = getForce();
-	}
-
-	void step(const Derivative& derivative, Scalar dt)
-	{
-		position += dt * derivative.velocity;
-		momentum += dt * derivative.force;
-		recalculateLinear();
-	}
-};
-
-
-struct RotationalState2
-{
-	// primary
-
-	Scalar		orientation;
-	Scalar		angularMomentum;
-
-	// secondary
-
-	Scalar		angularVelocity;
-
-	// constant
-
-	Scalar		inertia;
-	Scalar		inverseInertia;
-
-
-	void recalculateRotational()
-	{
-		angularVelocity = angularMomentum * inertia;
-	}
-
-
-	struct Derivative
-	{
-		Scalar	angularVelocity;
-		Scalar	torque;
-	};
-
-	void step(const Derivative& derivative, Scalar dt)
-	{
-		orientation += dt * derivative.angularVelocity;
-		angularMomentum += dt * derivative.torque;
-		recalculateRotational();
-	}
-};
-
-struct RotationalState3
-{
-	// primary
-
-	Quaternion	orientation;
-	Vector3		angularMomentum;
-
-	// secondary
-
-	Quaternion	spin;
-	Vector3		angularVelocity;
-
-	// constant
-
-	Scalar		inertia;
-	Scalar		inverseInertia;
-};
-
-
-struct State2 : public LinearState<2>, public RotationalState2
-{
-	void recalculate()
-	{
-		recalculateLinear();
-		recalculateRotational();
-	}
-
-	void integrate(Scalar t, Scalar dt)
-	{
-		rk4<LinearState<2>,LinearState<2>::Derivative>(*this, t, dt);
-	}
-};
-
-struct State3 : public LinearState<3>, public RotationalState3 {};
-
-
-} // namespace Mf
-
-#endif // _MOOF_RK4_HH_
-
-/** vim: set ts=4 sw=4 tw=80: *************************************************/
-
diff --git a/src/Moof/Resource.hh b/src/Moof/Resource.hh
index f7d1782..2740fc3 100644
--- a/src/Moof/Resource.hh
+++ b/src/Moof/Resource.hh
@@ -34,10 +34,11 @@
  * Interface for textures, sounds, and other types of resources.
  */
 
-#include <stdexcept>
 #include <string>
 #include <vector>
 
+#include <Moof/Exception.hh>
+
 
 namespace Mf {
 
@@ -49,11 +50,6 @@ namespace Mf {
 class Resource
 {
 public:
-	struct Exception : public std::runtime_error
-	{
-		explicit Exception(const std::string& what_arg) :
-			std::runtime_error(what_arg) {}
-	};
 
 	virtual ~Resource();
 
@@ -74,7 +70,20 @@ public:
 
 	static std::string getPath(const std::string& name);
 
+
+	struct Exception : public Mf::Exception
+	{
+		explicit Exception(unsigned error) :
+			Mf::Exception(error) {}
+
+		void raise()
+		{
+			throw *this;
+		}
+	};
+
 private:
+
 	static std::vector<std::string> searchPaths_;
 };
 
diff --git a/src/Moof/RigidBody.hh b/src/Moof/RigidBody.hh
index 501f7c9..e7dee38 100644
--- a/src/Moof/RigidBody.hh
+++ b/src/Moof/RigidBody.hh
@@ -29,39 +29,300 @@
 #ifndef _MOOF_RIGIDBODY_HH_
 #define _MOOF_RIGIDBODY_HH_
 
+#include <vector>
+
+#include <boost/bind.hpp>
+#include <boost/function.hpp>
+
+#include <Moof/Entity.hh>
 #include <Moof/Math.hh>
-#include <Moof/State.hh>
 
 
 namespace Mf {
 
 
+template <int D = 3>
+struct LinearState
+{
+	typedef cml::vector< Scalar, cml::fixed<D> >				Vector;
+	typedef boost::function<const Vector& (const LinearState&)>	ForceFunction;
+
+	// primary
+	
+	Vector		position;
+	Vector		momentum;
+
+	// secondary
+
+	Vector		velocity;
+
+	// user
+
+	Vector		force;
+	std::vector<ForceFunction> forces;
+
+	// constant
+	
+	Scalar		mass;
+	Scalar		inverseMass;
+
+
+	void recalculateLinear()
+	{
+		velocity = momentum * inverseMass;
+	}
+
+
+	struct GravityForce
+	{
+		explicit GravityForce(Scalar a = -9.8)
+		{
+			force.zero();
+			acceleration = a;
+		}
+
+		const Vector& operator () (const LinearState& state)
+		{
+			force[1] = state.mass * acceleration;
+			return force;
+		}
+
+	private:
+
+		Vector force;
+		Scalar acceleration;
+	};
+
+
+	void init()
+	{
+		position.zero();
+		momentum.zero();
+
+		velocity.zero();
+
+		force.zero();
+		forces.clear();
+
+		mass = SCALAR(1.0);
+		inverseMass = 1.0 / mass;
+	}
+
+
+	struct Derivative
+	{
+		Vector	velocity;
+		Vector	force;
+
+		Derivative operator*(Scalar dt) const
+		{
+			Derivative derivative;
+			derivative.velocity = dt * velocity;
+			derivative.force = dt * force;
+			return derivative;
+		}
+
+		Derivative operator+(const Derivative& other) const
+		{
+			Derivative derivative;
+			derivative.velocity = velocity + other.velocity;
+			derivative.force = force + other.force;
+			return derivative;
+		}
+	};
+
+
+	Vector getForce() const
+	{
+		Vector f(force);
+
+		for (size_t i = 0; i < forces.size(); ++i)
+		{
+			f += forces[i](*this);
+		}
+
+		return f;
+	}
+
+	void getDerivative(Derivative& derivative, Scalar t) const
+	{
+		derivative.velocity = velocity;
+		derivative.force = getForce();
+	}
+
+	void step(const Derivative& derivative, Scalar dt)
+	{
+		position += dt * derivative.velocity;
+		momentum += dt * derivative.force;
+		recalculateLinear();
+	}
+};
+
+
+struct RotationalState2
+{
+	// primary
+
+	Scalar		orientation;
+	Scalar		angularMomentum;
+
+	// secondary
+
+	Scalar		angularVelocity;
+
+	// constant
+
+	Scalar		inertia;
+	Scalar		inverseInertia;
+
+
+	void recalculateRotational()
+	{
+		angularVelocity = angularMomentum * inertia;
+	}
+
+
+	struct Derivative
+	{
+		Scalar	angularVelocity;
+		Scalar	torque;
+	};
+
+	void step(const Derivative& derivative, Scalar dt)
+	{
+		orientation += dt * derivative.angularVelocity;
+		angularMomentum += dt * derivative.torque;
+		recalculateRotational();
+	}
+};
+
+struct RotationalState3
+{
+	// primary
+
+	Quaternion	orientation;
+	Vector3		angularMomentum;
+
+	// secondary
+
+	Quaternion	spin;
+	Vector3		angularVelocity;
+
+	// constant
+
+	Scalar		inertia;
+	Scalar		inverseInertia;
+
+
+	void recalculateRotational()
+	{
+		angularVelocity = angularMomentum * inertia;
+	}
+};
+
+
+struct State2 : public LinearState<2>, public RotationalState2
+{
+	void recalculate()
+	{
+		recalculateLinear();
+		recalculateRotational();
+	}
+
+	void update(Scalar t, Scalar dt)
+	{
+		rk4<LinearState<2>,LinearState<2>::Derivative>(*this, t, dt);
+	}
+};
+
+struct State3 : public LinearState<3>, public RotationalState3
+{
+	void recalculate()
+	{
+		recalculateLinear();
+		recalculateRotational();
+	}
+
+	void update(Scalar t, Scalar dt)
+	{
+		rk4<LinearState<3>,LinearState<3>::Derivative>(*this, t, dt);
+	}
+};
+
+
+template <class T>
+inline T interpolate(const T& a, const T& b, Scalar alpha)
+{
+	return cml::lerp(a, b, alpha);
+}
+
+template <>
+inline State2 interpolate<State2>(const State2& a, const State2& b, Scalar alpha)
+{
+	State2 state(b);
+	state.position = interpolate(a.position, b.position, alpha);
+	state.momentum = interpolate(a.momentum, b.momentum, alpha);
+	state.orientation = interpolate(a.orientation, b.orientation, alpha);
+	state.angularMomentum = interpolate(a.angularMomentum, b.angularMomentum,
+			alpha);
+	return state;
+}
+
+template <>
+inline State3 interpolate<State3>(const State3& a, const State3& b, Scalar alpha)
+{
+	State3 state(b);
+	state.position = interpolate(a.position, b.position, alpha);
+	state.momentum = interpolate(a.momentum, b.momentum, alpha);
+	state.orientation = cml::slerp(a.orientation, b.orientation, alpha);
+	state.angularMomentum = interpolate(a.angularMomentum, b.angularMomentum,
+			alpha);
+	return state;
+}
+
+
+
 /**
- * Interface for physical things with mass, momentum, yada yada yada.
+ * Interface for anything that can move.
  */
 
-template <typename T>
-class RigidBody
+template <class T>
+class RigidBody : public Entity
 {
+protected:
+
+	T	mState;
+	T	mPrevState;
+
 public:
+
 	virtual ~RigidBody() {}
 
 	virtual void update(Scalar t, Scalar dt)
 	{
-		prevState_ = currentState_;
-		currentState_.integrate(t, dt);
+		mPrevState = mState;
+		mState.update(t, dt);
 	}
 
-	T getInterpolatedState(Scalar alpha) const
+	const T& getState() const
 	{
-		return currentState_.interpolate(alpha, prevState_);
+		return mState;
 	}
 
-protected:
-	T prevState_;
-	T currentState_;
+	T getState(Scalar alpha) const
+	{
+		return interpolate(mPrevState, mState, alpha);
+	}
+
+	const T& getLastState() const
+	{
+		return mPrevState;
+	}
 };
 
+typedef RigidBody<State2> RigidBody2;
+typedef RigidBody<State3> RigidBody3;
+
 
 } // namespace Mf
 
@@ -69,4 +330,3 @@ protected:
 
 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 
-
diff --git a/src/Moof/Script.hh b/src/Moof/Script.hh
index 2fe275e..4db93d5 100644
--- a/src/Moof/Script.hh
+++ b/src/Moof/Script.hh
@@ -468,15 +468,15 @@ struct Script
 
 
 	Script() :
-		state_(luaL_newstate())
+		mState(luaL_newstate())
 	{
-		lua_pushlightuserdata(state_, this);
-		lua_setfield(state_, LUA_REGISTRYINDEX, "_script_obj");
+		lua_pushlightuserdata(mState, this);
+		lua_setfield(mState, LUA_REGISTRYINDEX, "_script_obj");
 	}
 
 	~Script()
 	{
-		if (isMainThread_) lua_close(state_);
+		if (mIsMainThread) lua_close(mState);
 	}
 
 
@@ -488,24 +488,24 @@ struct Script
 
 	void importStandardLibraries()
 	{
-		luaL_openlibs(state_);
+		luaL_openlibs(mState);
 	}
 
 	void importFunction(const std::string& name, const Function& function)
 	{
 		push(function);
-		lua_setglobal(state_, name.c_str());
+		lua_setglobal(mState, name.c_str());
 	}
 
 
 	STATUS doString(const std::string& commands)
 	{
-		return (STATUS)luaL_dostring(state_, commands.c_str());
+		return (STATUS)luaL_dostring(mState, commands.c_str());
 	}
 
 	STATUS doFile(const std::string& file)
 	{
-		return (STATUS)luaL_dofile(state_, file.c_str());
+		return (STATUS)luaL_dofile(mState, file.c_str());
 	}
 
 
@@ -515,32 +515,32 @@ struct Script
 
 	Script pushNewThread()
 	{
-		return Script(state_);
+		return Script(mState);
 	}
 
 	void pushThread()
 	{
-		lua_pushthread(state_);
+		lua_pushthread(mState);
 	}
 
 	STATUS resume(int nargs)
 	{
-		return (STATUS)lua_resume(state_, nargs);
+		return (STATUS)lua_resume(mState, nargs);
 	}
 
 	STATUS getStatus() const
 	{
-		return (STATUS)lua_status(state_);
+		return (STATUS)lua_status(mState);
 	}
 
 	int yield(int results)
 	{
-		return lua_yield(state_, results);
+		return lua_yield(mState, results);
 	}
 
 	bool isMainThread() const
 	{
-		return isMainThread_;
+		return mIsMainThread;
 	}
 
 
@@ -556,7 +556,7 @@ struct Script
 
 	void throwError()
 	{
-		lua_error(state_);
+		lua_error(mState);
 	}
 
 
@@ -566,22 +566,22 @@ struct Script
 
 	Value getGlobalTable() const
 	{
-		return Value(state_, GLOBALS);
+		return Value(mState, GLOBALS);
 	}
 
 	Value getRegistryTable() const
 	{
-		return Value(state_, REGISTRY);
+		return Value(mState, REGISTRY);
 	}
 
 	Value getEnvironmentTable() const
 	{
-		return Value(state_, ENVIRONMENT);
+		return Value(mState, ENVIRONMENT);
 	}
 
 	Value getTop() const
 	{
-		return Value(state_, lua_gettop(state_));
+		return Value(mState, lua_gettop(mState));
 	}
 
 	/**
@@ -590,12 +590,12 @@ struct Script
 
 	int getSize() const
 	{
-		return lua_gettop(state_);
+		return lua_gettop(mState);
 	}
 
 	void setSize(int size)
 	{
-		lua_settop(state_, size);
+		lua_settop(mState, size);
 	}
 
 	void clear()
@@ -614,7 +614,7 @@ struct Script
 
 	bool checkStack(int extra)
 	{
-		return (bool)lua_checkstack(state_, extra);
+		return (bool)lua_checkstack(mState, extra);
 	}
 
 
@@ -624,7 +624,7 @@ struct Script
 
 	void concat(int n)
 	{
-		lua_concat(state_, n);
+		lua_concat(mState, n);
 	}
 
 
@@ -635,77 +635,77 @@ struct Script
 	template <typename T>
 	void push(T value)
 	{
-		lua_pushinteger(state_, lua_Integer(value));
+		lua_pushinteger(mState, lua_Integer(value));
 	}
 
 	void push(bool value)
 	{
-		lua_pushboolean(state_, int(value));
+		lua_pushboolean(mState, int(value));
 	}
 
 	void push(float value)
 	{
-		lua_pushnumber(state_, (lua_Number)value);
+		lua_pushnumber(mState, (lua_Number)value);
 	}
 	void push(double value)
 	{
-		lua_pushnumber(state_, (lua_Number)value);
+		lua_pushnumber(mState, (lua_Number)value);
 	}
 
 	void push(const std::string& value)
 	{
-		lua_pushlstring(state_, value.c_str(), value.length());
+		lua_pushlstring(mState, value.c_str(), value.length());
 	}
 	void push(const char* value)
 	{
-		lua_pushstring(state_, value);
+		lua_pushstring(mState, value);
 	}
 	void push(const char* value, size_t length)
 	{
-		lua_pushlstring(state_, value, length);
+		lua_pushlstring(mState, value, length);
 	}
 
 	void push(const Function& function)
 	{
-		functions_.push_back(function);
+		mFunctions.push_back(function);
 
-		lua_pushlightuserdata(state_, (void*)&functions_.back());
-		lua_pushcclosure(state_, dispatchCall, 1);
+		lua_pushlightuserdata(mState, (void*)&mFunctions.back());
+		lua_pushcclosure(mState, dispatchCall, 1);
 	}
 
 	void push(void* data)
 	{
-		lua_pushlightuserdata(state_, data);
+		lua_pushlightuserdata(mState, data);
 	}
 
 	void pushNil()
 	{
-		lua_pushnil(state_);
+		lua_pushnil(mState);
 	}
 
 	void pushFromThread(Script& thread, int n)
 	{
-		lua_xmove(thread.state_, state_, n);
+		lua_xmove(thread.mState, mState, n);
 	}
 
 	STATUS pushCode(const std::string& filename)
 	{
-		return (STATUS)luaL_loadfile(state_, filename.c_str());
+		return (STATUS)luaL_loadfile(mState, filename.c_str());
 	}
 
 	STATUS pushCode(const std::string& name, const char* buffer, size_t size)
 	{
-		return (STATUS)luaL_loadbuffer(state_, buffer, size, name.c_str());
+		return (STATUS)luaL_loadbuffer(mState, buffer, size, name.c_str());
 	}
 
 	void* pushNewData(size_t size)
 	{
-		return lua_newuserdata(state_, size);
+		return lua_newuserdata(mState, size);
 	}
 
 	void pushNewTable()
 	{
-		lua_newtable(state_);
+		lua_newtable(mState);
 	}
 
 
@@ -718,7 +718,7 @@ struct Script
 
 	STATUS call(int nargs, int nresults = LUA_MULTRET)
 	{
-		return (STATUS)lua_pcall(state_, nargs, nresults, 0);
+		return (STATUS)lua_pcall(mState, nargs, nresults, 0);
 	}
 
 
@@ -728,7 +728,7 @@ struct Script
 
 	void pop(int n = 1)
 	{
-		lua_pop(state_, n);
+		lua_pop(mState, n);
 	}
 
 
@@ -738,7 +738,7 @@ struct Script
 
 	Value operator [] (int index) const
 	{
-		return Value(state_, index);
+		return Value(mState, index);
 	}
 
 
@@ -748,12 +748,12 @@ struct Script
 
 	void get(const std::string& field,  int index = GLOBALS) const
 	{
-		lua_getfield(state_, index, field.c_str());
+		lua_getfield(mState, index, field.c_str());
 	}
 
 	void set(const std::string& field, int index = GLOBALS)
 	{
-		lua_setfield(state_, index, field.c_str());
+		lua_setfield(mState, index, field.c_str());
 	}
 
 
@@ -763,34 +763,34 @@ struct Script
 
 	void collectAll()
 	{
-		lua_gc(state_, LUA_GCCOLLECT, 0);
+		lua_gc(mState, LUA_GCCOLLECT, 0);
 	}
 
 	void stopCollector()
 	{
-		lua_gc(state_, LUA_GCSTOP, 0);
+		lua_gc(mState, LUA_GCSTOP, 0);
 	}
 
 	void restartCollector()
 	{
-		lua_gc(state_, LUA_GCRESTART, 0);
+		lua_gc(mState, LUA_GCRESTART, 0);
 	}
 
 	int getUsedMemory() const
 	{
 		// in kilobytes
-		return lua_gc(state_, LUA_GCCOUNT, 0);
+		return lua_gc(mState, LUA_GCCOUNT, 0);
 	}
 
 	void collectStep(int step)
 	{
-		lua_gc(state_, LUA_GCSTEP, step);
+		lua_gc(mState, LUA_GCSTEP, step);
 	}
 
 	void tuneCollector(int pause, int step)
 	{
-		lua_gc(state_, LUA_GCSETPAUSE, pause);
-		lua_gc(state_, LUA_GCSETSTEPMUL, step);
+		lua_gc(mState, LUA_GCSETPAUSE, pause);
+		lua_gc(mState, LUA_GCSETSTEPMUL, step);
 	}
 
 
@@ -810,8 +810,8 @@ struct Script
 private:
 
 	Script(lua_State* state) :
-		state_(lua_newthread(state)),
-		isMainThread_(false) {}
+		mState(lua_newthread(state)),
+		mIsMainThread(false) {}
 
 	static int dispatchCall(lua_State* state)
 	{
@@ -825,9 +825,9 @@ private:
 		return (*function)(*script);
 	}
 
-	lua_State*			state_;
-	bool				isMainThread_;
-	std::list<Function>	functions_;
+	lua_State*			mState;
+	bool				mIsMainThread;
+	std::list<Function>	mFunctions;
 };
 
 
diff --git a/src/Moof/Settings.cc b/src/Moof/Settings.cc
index 5a321b0..5a4f991 100644
--- a/src/Moof/Settings.cc
+++ b/src/Moof/Settings.cc
@@ -46,7 +46,7 @@ void Settings::parseArgs(int argc, char* argv[])
 {
 	for (int i = 1; i < argc; ++i)
 	{
-		script_.doString(argv[i]);
+		mScript.doString(argv[i]);
 	}
 }
 
@@ -74,12 +74,12 @@ void Settings::loadFromFiles(const std::vector<std::string>& filePaths)
 			boost::replace_all(path, "$HOME", home);
 		}
 
-		if (script_.doFile(path) != Script::SUCCESS)
+		if (mScript.doFile(path) != Script::SUCCESS)
 		{
 			std::string str;
-			script_[-1].get(str);
+			mScript[-1].get(str);
 			logScript("%s", str.c_str());
-			script_.clear();
+			mScript.clear();
 		}
 	}
 }
diff --git a/src/Moof/Settings.hh b/src/Moof/Settings.hh
index dc29deb..42e7d3a 100644
--- a/src/Moof/Settings.hh
+++ b/src/Moof/Settings.hh
@@ -49,11 +49,12 @@ namespace Mf {
 class Settings
 {
 public:
+
 	Settings() :
-		globals_(script_.getGlobalTable()),
-		top_(script_[-1])
+		mGlobals(mScript.getGlobalTable()),
+		mTop(mScript[-1])
 	{
-		importLogScript(script_);
+		importLogScript(mScript);
 	}
 
 	// get global instance
@@ -68,8 +69,9 @@ public:
 	bool get(const std::string& key, T& value);
 
 private:
-	Script			script_;
-	Script::Value	globals_, top_;
+
+	Script			mScript;
+	Script::Value	mGlobals, mTop;
 };
 
 
@@ -79,24 +81,24 @@ bool Settings::get(const std::string& key, T& value)
 	std::vector<std::string> fields;
 	boost::split(fields, key, boost::is_any_of("."));
 
-	globals_.pushCopy();
+	mGlobals.pushCopy();
 
 	std::vector<std::string>::iterator it;
 	for (it = fields.begin(); it != fields.end(); ++it)
 	{
-		if (top_.isTable())
+		if (mTop.isTable())
 		{
-			top_.pushField(*it);
+			mTop.pushField(*it);
 		}
 		else
 		{
-			script_.clear();
+			mScript.clear();
 			return false;
 		}
 	}
 
-	bool got = top_.get(value);
-	script_.clear();
+	bool got = mTop.get(value);
+	mScript.clear();
 	return got;
 }
 
diff --git a/src/Moof/Sound.cc b/src/Moof/Sound.cc
index 4cb2913..27905ba 100644
--- a/src/Moof/Sound.cc
+++ b/src/Moof/Sound.cc
@@ -46,8 +46,9 @@
 namespace Mf {
 
 
-struct Sound::Impl
+class Sound::Impl
 {
+public:
 
 	static ALenum getAudioFormat(const vorbis_info* audioInfo)
 	{
@@ -55,50 +56,51 @@ struct Sound::Impl
 		else						  return AL_FORMAT_STEREO16;
 	}
 	
+
 	class Buffer;
 	typedef boost::shared_ptr<Buffer> BufferP;
 	
 	class Buffer : public Mippleton<Buffer>
 	{
-		OggVorbis_File			oggStream;
-		ALenum					audioFormat;
-		ALsizei					audioFreq;
-		std::vector<ALuint>		objects;
+		OggVorbis_File			mOggStream;
+		ALenum					mFormat;
+		ALsizei					mFreq;
+		std::vector<ALuint>		mObjects;
 
 	public:
 
 		Buffer(const std::string& name) :
 			Mippleton<Buffer>(name)
 		{
-			oggStream.datasource = 0;
+			mOggStream.datasource = 0;
 			openFile();
 		}
 
 		~Buffer()
 		{
-			while (!objects.empty())
+			while (!mObjects.empty())
 			{
-				alDeleteBuffers(1, &objects.back());
-				objects.pop_back();
+				alDeleteBuffers(1, &mObjects.back());
+				mObjects.pop_back();
 			}
 
-			if (oggStream.datasource)
+			if (mOggStream.datasource)
 			{
-				ov_clear(&oggStream);
+				ov_clear(&mOggStream);
 			}
 		}
 
 
 		void openFile()
 		{
-			if (oggStream.datasource)
+			if (mOggStream.datasource)
 			{
-				ov_clear(&oggStream);
-				oggStream.datasource = 0;
+				ov_clear(&mOggStream);
+				mOggStream.datasource = 0;
 			}
 
 			std::string filePath = Sound::getPath(getName());
-			int result = ov_fopen((char*)filePath.c_str(), &oggStream);
+			int result = ov_fopen((char*)filePath.c_str(), &mOggStream);
 
 			if (result < 0)
 			{
@@ -107,9 +109,9 @@ struct Sound::Impl
 				throw Exception(Exception::BAD_AUDIO_FORMAT);
 			}
 
-			vorbis_info* vorbisInfo = ov_info(&oggStream, -1);
-			audioFormat = getAudioFormat(vorbisInfo);
-			audioFreq = vorbisInfo->rate;
+			vorbis_info* vorbisInfo = ov_info(&mOggStream, -1);
+			mFormat = getAudioFormat(vorbisInfo);
+			mFreq = vorbisInfo->rate;
 
 			logDebug("   channels: %d", vorbisInfo->channels);
 			logDebug("  frequency: %d", vorbisInfo->rate);
@@ -118,8 +120,8 @@ struct Sound::Impl
 
 		void loadAll(ALuint source)
 		{
-			if (!oggStream.datasource) openFile();
-			if (!oggStream.datasource) return;
+			if (!mOggStream.datasource) openFile();
+			if (!mOggStream.datasource) return;
 
 			char data[BUFFER_SIZE];
 			int size = 0;
@@ -127,7 +129,7 @@ struct Sound::Impl
 			for (;;)
 			{
 				int section;
-				int result = ov_read(&oggStream, data + size,
+				int result = ov_read(&mOggStream, data + size,
 						BUFFER_SIZE - size, 0, 2, 1, &section);
 
 				if (result > 0)
@@ -150,29 +152,29 @@ struct Sound::Impl
 			ALuint obj;
 			alGenBuffers(1, &obj);
 
-			alBufferData(obj, audioFormat, data, size, audioFreq);
+			alBufferData(obj, mFormat, data, size, mFreq);
 
-			objects.push_back(obj);
+			mObjects.push_back(obj);
 
 			alSourcei(source, AL_BUFFER, obj);
 
 			// don't need this anymore
-			ov_clear(&oggStream);
-			oggStream.datasource = 0;
+			ov_clear(&mOggStream);
+			mOggStream.datasource = 0;
 		}
 
 
 		void beginStream(ALuint source, int nBuffers = 8)
 		{
-			if (!oggStream.datasource) openFile();
-			if (!oggStream.datasource) return;
+			if (!mOggStream.datasource) openFile();
+			if (!mOggStream.datasource) return;
 
 			ALuint objs[nBuffers];
 			alGenBuffers(nBuffers, objs);
 
 			for (int i = 0; i < nBuffers; ++i)
 			{
-				objects.push_back(objs[i]);
+				mObjects.push_back(objs[i]);
 				stream(objs[i]);
 			}
 
@@ -189,10 +191,10 @@ struct Sound::Impl
 		StreamStatus stream(ALuint buffer)
 		{
 			std::vector<ALuint>::iterator it =
-				std::find(objects.begin(), objects.end(), buffer);
+				std::find(mObjects.begin(), mObjects.end(), buffer);
 
 			// that buffer doesn't belong to us
-			if (it == objects.end()) return STREAM_WRONG;
+			if (it == mObjects.end()) return STREAM_WRONG;
 
 			char data[BUFFER_SIZE];
 			int size = 0;
@@ -200,7 +202,7 @@ struct Sound::Impl
 			while (size < BUFFER_SIZE)
 			{
 				int section;
-				int result = ov_read(&oggStream, data + size,
+				int result = ov_read(&mOggStream, data + size,
 						BUFFER_SIZE - size, 0, 2, 1, &section);
 
 				if (result > 0)
@@ -216,15 +218,15 @@ struct Sound::Impl
 
 			if (size == 0) return STREAM_EOF;
 
-			alBufferData(buffer, audioFormat, data, size, audioFreq);
+			alBufferData(buffer, mFormat, data, size, mFreq);
 
 			return STREAM_OK;
 		}
 
 		inline void rewind()
 		{
-			if (!oggStream.datasource) openFile();
-			else ov_raw_seek(&oggStream, 0);
+			if (!mOggStream.datasource) openFile();
+			else ov_raw_seek(&mOggStream, 0);
 		}
 
 
@@ -234,16 +236,16 @@ struct Sound::Impl
 			// clear any openal errors
 			alGetError();
 
-			while (!objects.empty())
+			while (!mObjects.empty())
 			{
-				ALuint buffer = objects.back();
+				ALuint buffer = mObjects.back();
 				alDeleteBuffers(1, &buffer);
 
 				// if an error occured, the buffer was not deleted because it's
 				// still in use by some source
 				if (alGetError() != AL_NO_ERROR) return false;
 
-				objects.pop_back();
+				mObjects.pop_back();
 			}
 
 			return true;
@@ -252,56 +254,56 @@ struct Sound::Impl
 
 
 	Impl(const std::string& name) :
-		buffer_(Buffer::getInstance(name)),
-		playing_(false),
-		looping_(false)
+		mBuffer(Buffer::getInstance(name)),
+		mIsPlaying(false),
+		mIsLooping(false)
 	{
 		ALfloat zero[] = {0.0f, 0.0f, 0.0f};
 		
-		alGenSources(1, &source_);
+		alGenSources(1, &mSource);
 
-		alSourcef(source_,  AL_PITCH, 1.0f);
-		alSourcef(source_,  AL_GAIN, 1.0f);
-		alSourcefv(source_, AL_POSITION, zero);
-		alSourcefv(source_, AL_VELOCITY, zero);
+		alSourcef(mSource,  AL_PITCH, 1.0f);
+		alSourcef(mSource,  AL_GAIN, 1.0f);
+		alSourcefv(mSource, AL_POSITION, zero);
+		alSourcefv(mSource, AL_VELOCITY, zero);
 	}
 
 	~Impl()
 	{
-		alDeleteSources(1, &source_);
+		alDeleteSources(1, &mSource);
 	}
 
 
 	void play()
 	{
 		ALenum type;
-		alGetSourcei(source_, AL_SOURCE_TYPE, &type);
+		alGetSourcei(mSource, AL_SOURCE_TYPE, &type);
 
 		if (type != AL_STATIC)
 		{
-			buffer_->loadAll(source_);
+			mBuffer->loadAll(mSource);
 		}
 
-		alSourcei(source_, AL_LOOPING, looping_);
-		alSourcePlay(source_);
-		playing_ = true;
+		alSourcei(mSource, AL_LOOPING, mIsLooping);
+		alSourcePlay(mSource);
+		mIsPlaying = true;
 	}
 
 
 	void stream()
 	{
 		ALenum type;
-		alGetSourcei(source_, AL_SOURCE_TYPE, &type);
+		alGetSourcei(mSource, AL_SOURCE_TYPE, &type);
 
-		alSourcei(source_, AL_BUFFER, AL_NONE);
-		buffer_->rewind();
-		buffer_->beginStream(source_);
+		alSourcei(mSource, AL_BUFFER, AL_NONE);
+		mBuffer->rewind();
+		mBuffer->beginStream(mSource);
 
-		alSourcei(source_, AL_LOOPING, AL_FALSE);
-		alSourcePlay(source_);
-		playing_ = true;
+		alSourcei(mSource, AL_LOOPING, AL_FALSE);
+		alSourcePlay(mSource);
+		mIsPlaying = true;
 
-		streamTimer.init(boost::bind(&Impl::streamUpdate, this, _1, _2), 1.0,
+		mStreamTimer.init(boost::bind(&Impl::streamUpdate, this, _1, _2), 1.0,
 				Timer::REPEAT);
 	}
 
@@ -309,53 +311,53 @@ struct Sound::Impl
 	{
 		ALint finished = 0;
 
-		alGetSourcei(source_, AL_BUFFERS_PROCESSED, &finished);
+		alGetSourcei(mSource, AL_BUFFERS_PROCESSED, &finished);
 
 		while (finished-- > 0)
 		{
 			ALuint buffer;
 
-			alSourceUnqueueBuffers(source_, 1, &buffer);
+			alSourceUnqueueBuffers(mSource, 1, &buffer);
 
-			Buffer::StreamStatus status = buffer_->stream(buffer);
+			Buffer::StreamStatus status = mBuffer->stream(buffer);
 
 			if (status == Buffer::STREAM_OK)
 			{
-				alSourceQueueBuffers(source_, 1, &buffer);
+				alSourceQueueBuffers(mSource, 1, &buffer);
 			}
 			else if (status == Buffer::STREAM_EOF)
 			{
-				if (!queue_.empty())
+				if (!mQueue.empty())
 				{
 					// begin the next buffer in the queue
-					expired_.push_back(buffer_);
-					buffer_ = queue_.front();
-					queue_.pop();
-					buffer_->beginStream(source_, 1);
+					mExpired.push_back(mBuffer);
+					mBuffer = mQueue.front();
+					mQueue.pop();
+					mBuffer->beginStream(mSource, 1);
 				}
-				else if (looping_)
+				else if (mIsLooping)
 				{
 					// restart from the beginning
-					buffer_->rewind();
-					buffer_->stream(buffer);
-					alSourceQueueBuffers(source_, 1, &buffer);
+					mBuffer->rewind();
+					mBuffer->stream(buffer);
+					alSourceQueueBuffers(mSource, 1, &buffer);
 				}
 			}
 			else if (status == Buffer::STREAM_WRONG)
 			{
 				clear();
-				buffer_->beginStream(source_, 1);
+				mBuffer->beginStream(mSource, 1);
 			}
 		}
 
 		ALenum state;
-		alGetSourcei(source_, AL_SOURCE_STATE, &state);
+		alGetSourcei(mSource, AL_SOURCE_STATE, &state);
 
 		// restart playing if we're stopped but supposed to be playing... this
 		// means we didn't queue enough and the audio skipped
-		if (playing_ && state != AL_PLAYING)
+		if (mIsPlaying && state != AL_PLAYING)
 		{
-			alSourcePlay(source_);
+			alSourcePlay(mSource);
 		}
 	}
 
@@ -363,29 +365,29 @@ struct Sound::Impl
 	{
 		// try to remove expired buffers
 		std::vector<BufferP>::iterator it;
-		for (it = expired_.end() - 1; it >= expired_.begin(); --it)
+		for (it = mExpired.end() - 1; it >= mExpired.begin(); --it)
 		{
-			if ((*it)->clear()) expired_.erase(it);
+			if ((*it)->clear()) mExpired.erase(it);
 		}
 	}
 
 
 	void stop()
 	{
-		alSourceStop(source_);
-		playing_ = false;
+		alSourceStop(mSource);
+		mIsPlaying = false;
 	}
 
 	inline void pause()
 	{
-		alSourcePause(source_);
-		playing_ = false;
+		alSourcePause(mSource);
+		mIsPlaying = false;
 	}
 
 	inline void resume()
 	{
-		alSourcePlay(source_);
-		playing_ = true;
+		alSourcePlay(mSource);
+		mIsPlaying = true;
 	}
 
 
@@ -393,12 +395,12 @@ struct Sound::Impl
 	{
 		bool playing = isPlaying();
 		ALenum type;
-		alGetSourcei(source_, AL_SOURCE_TYPE, &type);
+		alGetSourcei(mSource, AL_SOURCE_TYPE, &type);
 
 		stop();
 
-		//alSourcei(source_, AL_BUFFER, AL_NONE);
-		buffer_ = Buffer::getInstance(name);
+		//alSourcei(mSource, AL_BUFFER, AL_NONE);
+		mBuffer = Buffer::getInstance(name);
 
 		if (type == AL_STREAMING)
 		{
@@ -413,16 +415,16 @@ struct Sound::Impl
 	inline void enqueue(const std::string& name)
 	{
 		BufferP buffer = Buffer::getInstance(name);
-		queue_.push(buffer);
+		mQueue.push(buffer);
 	}
 
 
 	inline bool isPlaying() const
 	{
-		if (playing_) return true;
+		if (mIsPlaying) return true;
 
 		ALenum state;
-		alGetSourcei(source_, AL_SOURCE_STATE, &state);
+		alGetSourcei(mSource, AL_SOURCE_STATE, &state);
 
 		return state == AL_PLAYING;
 	}
@@ -430,28 +432,28 @@ struct Sound::Impl
 
 	inline void setLooping(bool looping)
 	{
-		looping_ = looping;
+		mIsLooping = looping;
 
 		ALenum type;
-		alGetSourcei(source_, AL_SOURCE_TYPE, &type);
+		alGetSourcei(mSource, AL_SOURCE_TYPE, &type);
 
 		if (type != AL_STREAMING)
 		{
-			alSourcei(source_, AL_LOOPING, looping_);
+			alSourcei(mSource, AL_LOOPING, mIsLooping);
 		}
 	}
 
 
-	ALuint					source_;
-	BufferP					buffer_;
+	ALuint					mSource;
+	BufferP					mBuffer;
 
-	bool					playing_;
-	bool					looping_;
+	bool					mIsPlaying;
+	bool					mIsLooping;
 
-	std::queue<BufferP>		queue_;
-	std::vector<BufferP>	expired_;
+	std::queue<BufferP>		mQueue;
+	std::vector<BufferP>	mExpired;
 
-	Timer					streamTimer;
+	Timer					mStreamTimer;
 
 	void streamUpdate(Timer& timer, Scalar t)
 	{
@@ -464,43 +466,43 @@ struct Sound::Impl
 
 Sound::Sound(const std::string& name) :
 	// pass through
-	impl_(new Sound::Impl(name)) {}
+	mImpl(new Sound::Impl(name)) {}
 
 
 void Sound::play()
 {
 	// pass through
-	impl_->play();
+	mImpl->play();
 }
 
 void Sound::stream()
 {
 	// pass through
-	impl_->stream();
+	mImpl->stream();
 }
 
 
 void Sound::stop()
 {
 	// pass through
-	impl_->stop();
+	mImpl->stop();
 }
 
 void Sound::pause()
 {
 	// pass through
-	impl_->pause();
+	mImpl->pause();
 }
 
 void Sound::resume()
 {
 	// pass through
-	impl_->resume();
+	mImpl->resume();
 }
 
 void Sound::toggle()
 {
-	if (impl_->playing_) pause();
+	if (mImpl->mIsPlaying) pause();
 	else resume();
 }
 
@@ -508,48 +510,48 @@ void Sound::toggle()
 void Sound::setSample(const std::string& name)
 {
 	// pass through
-	impl_->setSample(name);
+	mImpl->setSample(name);
 }
 
 void Sound::enqueue(const std::string& name)
 {
 	// pass through
-	impl_->enqueue(name);
+	mImpl->enqueue(name);
 }
 
 
 bool Sound::isPlaying() const
 {
 	// pass through
-	return impl_->isPlaying();
+	return mImpl->isPlaying();
 }
 
 void Sound::setPosition(const Vector3& position)
 {
 	float p[3] = {position[0], position[1], position[2]};
-	alSourcefv(impl_->source_, AL_POSITION, p);
+	alSourcefv(mImpl->mSource, AL_POSITION, p);
 }
 
 void Sound::setVelocity(const Vector3& velocity)
 {
 	float v[3] = {velocity[0], velocity[1], velocity[2]};
-	alSourcefv(impl_->source_, AL_VELOCITY, v);
+	alSourcefv(mImpl->mSource, AL_VELOCITY, v);
 }
 
 void Sound::setGain(Scalar gain)
 {
-	alSourcef(impl_->source_, AL_GAIN, float(gain));
+	alSourcef(mImpl->mSource, AL_GAIN, float(gain));
 }
 
 void Sound::setPitch(Scalar pitch)
 {
-	alSourcef(impl_->source_, AL_PITCH, float(pitch));
+	alSourcef(mImpl->mSource, AL_PITCH, float(pitch));
 }
 
 void Sound::setLooping(bool looping)
 {
 	// pass through
-	impl_->setLooping(looping);
+	mImpl->setLooping(looping);
 }
 
 
diff --git a/src/Moof/Sound.hh b/src/Moof/Sound.hh
index e5d312a..4e80fbe 100644
--- a/src/Moof/Sound.hh
+++ b/src/Moof/Sound.hh
@@ -51,7 +51,7 @@ typedef boost::shared_ptr<Sound> SoundP;
 class Sound : public Resource
 {
 	class Impl;
-	boost::shared_ptr<Impl> impl_;
+	boost::shared_ptr<Impl> mImpl;
 
 public:
 
@@ -66,9 +66,7 @@ public:
 	void play();
 	void stream();
 
-	// TODO - i don't like how there are two different methods that essentially
-	// do the same thing; the API should be exactly the same for both types of
-	// sounds; need a different way to distinguish how to handle the sound
+	// TODO - this API sucks
 
 	void stop();
 	void pause();
diff --git a/src/Moof/Texture.cc b/src/Moof/Texture.cc
index b778c1c..fc50cfa 100644
--- a/src/Moof/Texture.cc
+++ b/src/Moof/Texture.cc
@@ -61,15 +61,15 @@ class Texture::Impl : public Mippleton<Impl>
 
 	void unloadFromGL()
 	{
-		if (object_)
+		if (mObject)
 		{
-			if (object_ == globalObject_)
+			if (mObject == globalObject_)
 			{
 				globalObject_ = 0;
 			}
 
-			glDeleteTextures(1, &object_);
-			object_ = 0;
+			glDeleteTextures(1, &mObject);
+			mObject = 0;
 		}
 	}
 
@@ -81,7 +81,7 @@ class Texture::Impl : public Mippleton<Impl>
 
 	void contextRecreated(const Notification* note)
 	{
-		object_ = globalObject_ = 0;
+		mObject = globalObject_ = 0;
 		uploadToGL();
 	}
 
@@ -132,15 +132,15 @@ public:
 
 	explicit Impl(const std::string& name) :
 		Mippleton<Impl>(name),
-		surface_(0),
-		width_(0),
-		height_(0),
-		mode_(0),
-		minFilter_(GL_NEAREST),
-		magFilter_(GL_NEAREST),
-		wrapS_(GL_CLAMP),
-		wrapT_(GL_CLAMP),
-		object_(0)
+		mContext(0),
+		mWidth(0),
+		mHeight(0),
+		mMode(0),
+		mMinFilter(GL_NEAREST),
+		mMagFilter(GL_NEAREST),
+		mWrapS(GL_CLAMP),
+		mWrapT(GL_CLAMP),
+		mObject(0)
 	{
 		loadFromFile();
 
@@ -151,9 +151,9 @@ public:
 
 	~Impl()
 	{
-		if (surface_)
+		if (mContext)
 		{
-			SDL_FreeSurface(surface_);
+			SDL_FreeSurface(mContext);
 		}
 
 		unloadFromGL();
@@ -258,11 +258,11 @@ public:
 
 		if (temp->format->BytesPerPixel == 3)
 		{
-			mode_ = GL_RGB;
+			mMode = GL_RGB;
 		}
 		else if (temp->format->BytesPerPixel == 4)
 		{
-			mode_ = GL_RGBA;
+			mMode = GL_RGBA;
 		}
 		else
 		{
@@ -270,10 +270,10 @@ public:
 			throw Exception(Exception::BAD_IMAGE_FORMAT);
 		}
 
-		width_ = temp->w;
-		height_ = temp->h;
+		mWidth = temp->w;
+		mHeight = temp->h;
 
-		surface_ = temp;
+		mContext = temp;
 	}
 
 
@@ -284,34 +284,34 @@ public:
 
 	void uploadToGL()
 	{
-		if (object_)
+		if (mObject)
 		{
 			// already loaded
 			return;
 		}
 
-		if (!surface_) loadFromFile();
+		if (!mContext) loadFromFile();
 
-		glGenTextures(1, &object_);
-		glBindTexture(GL_TEXTURE_2D, object_);
+		glGenTextures(1, &mObject);
+		glBindTexture(GL_TEXTURE_2D, mObject);
 
 		glTexImage2D
 		(
 			GL_TEXTURE_2D,
 			0,
-			mode_,
-			surface_->w,
-			surface_->h,
+			mMode,
+			mContext->w,
+			mContext->h,
 			0,
-			mode_,
+			mMode,
 			GL_UNSIGNED_BYTE,
-			surface_->pixels
+			mContext->pixels
 		);
 
 		setProperties();
 
-		SDL_FreeSurface(surface_);
-		surface_ = 0;
+		SDL_FreeSurface(mContext);
+		mContext = 0;
 	}
 
 
@@ -322,66 +322,66 @@ public:
 
 	void setProperties()
 	{
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter_);
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magFilter_);
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapS_);
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapT_);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mMinFilter);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mMagFilter);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, mWrapS);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, mWrapT);
 	}
 
 	inline void setMinFilter(GLuint filter)
 	{
 		bind();
-		minFilter_ = filter;
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter_);
+		mMinFilter = filter;
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mMinFilter);
 	}
 
 	inline void setMagFilter(GLuint filter)
 	{
 		bind();
-		magFilter_ = filter;
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magFilter_);
+		mMagFilter = filter;
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mMagFilter);
 	}
 
 	inline void setWrapS(GLuint wrap)
 	{
 		bind();
-		wrapS_ = wrap;
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapS_);
+		mWrapS = wrap;
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, mWrapS);
 	}
 
 	inline void setWrapT(GLuint wrap)
 	{
 		bind();
-		wrapT_ = wrap;
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapT_);
+		mWrapT = wrap;
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, mWrapT);
 	}
 
 
 	inline void bind()
 	{
-		if (object_ == 0)
+		if (mObject == 0)
 		{
 			uploadToGL();
 		}
-		if (object_ != globalObject_)
+		if (mObject != globalObject_)
 		{
-			glBindTexture(GL_TEXTURE_2D, object_);
-			globalObject_ = object_;
+			glBindTexture(GL_TEXTURE_2D, mObject);
+			globalObject_ = mObject;
 		}
 	}
 
 
-	SDL_Surface*	surface_;
-	unsigned		width_;			///< Horizontal dimension of the image.
-	unsigned		height_;		///< Vertical dimension.
+	SDL_Surface*	mContext;
+	unsigned		mWidth;			///< Horizontal dimension of the image.
+	unsigned		mHeight;		///< Vertical dimension.
 
-	GLuint			mode_;			///< Depth of the image, GL_RGB or GL_RGBA.
-	GLuint			minFilter_;		///< Minifcation filter.
-	GLuint			magFilter_;		///< Magnification filter.
-	GLuint			wrapS_;			///< Wrapping behavior horizontally.
-	GLuint			wrapT_;			///< Wrapping behavior vertically.
+	GLuint			mMode;			///< Depth of the image, GL_RGB or GL_RGBA.
+	GLuint			mMinFilter;		///< Minifcation filter.
+	GLuint			mMagFilter;		///< Magnification filter.
+	GLuint			mWrapS;			///< Wrapping behavior horizontally.
+	GLuint			mWrapT;			///< Wrapping behavior vertically.
 
-	GLuint			object_;		///< GL texture handle.
+	GLuint			mObject;		///< GL texture handle.
 	static GLuint	globalObject_;	///< Global GL texture handle.
 };
 
@@ -390,7 +390,7 @@ GLuint Texture::Impl::globalObject_ = 0;
 
 Texture::Texture(const std::string& name) :
 	// pass through
-	impl_(Texture::Impl::getInstance(name)) {}
+	mImpl(Texture::Impl::getInstance(name)) {}
 
 
 /**
@@ -400,7 +400,7 @@ Texture::Texture(const std::string& name) :
 void Texture::bind() const
 {
 	// pass through
-	impl_->bind();
+	mImpl->bind();
 }
 
 
@@ -411,7 +411,7 @@ void Texture::bind() const
 GLuint Texture::getObject() const
 {
 	// pass through
-	return impl_->object_;
+	return mImpl->mObject;
 }
 
 
@@ -425,38 +425,38 @@ void Texture::resetBind()
 unsigned Texture::getWidth() const
 {
 	// pass through
-	return impl_->width_;
+	return mImpl->mWidth;
 }
 
 unsigned Texture::getHeight() const
 {
 	// pass through
-	return impl_->height_;
+	return mImpl->mHeight;
 }
 
 
 void Texture::setMinFilter(GLuint filter)
 {
 	// pass through
-	impl_->setMinFilter(filter);
+	mImpl->setMinFilter(filter);
 }
 
 void Texture::setMagFilter(GLuint filter)
 {
 	// pass through
-	impl_->setMagFilter(filter);
+	mImpl->setMagFilter(filter);
 }
 
 void Texture::setWrapS(GLuint wrap)
 {
 	// pass through
-	impl_->setWrapS(wrap);
+	mImpl->setWrapS(wrap);
 }
 
 void Texture::setWrapT(GLuint wrap)
 {
 	// pass through
-	impl_->setWrapT(wrap);
+	mImpl->setWrapT(wrap);
 }
 
 
diff --git a/src/Moof/Texture.hh b/src/Moof/Texture.hh
index 5710298..5aa38e1 100644
--- a/src/Moof/Texture.hh
+++ b/src/Moof/Texture.hh
@@ -53,7 +53,7 @@ typedef boost::shared_ptr<Texture> TextureP;
 class Texture : public Resource
 {
 	class Impl;
-	boost::shared_ptr<Impl> impl_;
+	boost::shared_ptr<Impl> mImpl;
 
 public:
 
diff --git a/src/Moof/Thread.hh b/src/Moof/Thread.hh
index 274f717..74952fa 100644
--- a/src/Moof/Thread.hh
+++ b/src/Moof/Thread.hh
@@ -105,22 +105,23 @@ class Mutex
     friend class Condition;
 
 public:
+
     Mutex()
 	{
-		mutex_ = SDL_CreateMutex();
+		mMutex = SDL_CreateMutex();
 	}
     ~Mutex()
 	{
-		SDL_DestroyMutex(mutex_);
+		SDL_DestroyMutex(mMutex);
 	}
 
     bool acquireLock()
 	{
-		return (SDL_LockMutex(mutex_) == 0);
+		return (SDL_LockMutex(mMutex) == 0);
 	}
     bool releaseLock()
 	{
-		return (SDL_UnlockMutex(mutex_) == 0);
+		return (SDL_UnlockMutex(mMutex) == 0);
 	}
 
     class Lock
@@ -128,39 +129,42 @@ public:
         friend class Condition;
 
     public:
+
         Lock(Mutex& mutex)
 		{
-			mutex_ = &mutex;
-			isLocked_ = false;
+			mMutex = &mutex;
+			mIsLocked = false;
 		}
         ~Lock()
 		{
-			if (isLocked_) release();
+			if (mIsLocked) release();
 		}
 
         bool acquire()
 		{
-			return (isLocked_ = mutex_->acquireLock());
+			return (mIsLocked = mMutex->acquireLock());
 		}
         bool release()
 		{
-			return mutex_->releaseLock();
-			isLocked_ = false;
+			return mMutex->releaseLock();
+			mIsLocked = false;
 		}
 
         bool isLocked() const
 		{
-			return isLocked_;
+			return mIsLocked;
 		}
 
     protected:
-        Mutex*	mutex_;
-        bool	isLocked_;
+
+        Mutex*	mMutex;
+        bool	mIsLocked;
     };
 
     class ScopedLock : public Lock
     {
 	public:
+
 		ScopedLock(Mutex& mutex) :
 			Lock(mutex)
 		{
@@ -169,13 +173,15 @@ public:
     };
 
 private:
-    SDL_mutex* mutex_;
+
+    SDL_mutex* mMutex;
 };
 
 
 class Condition
 {
 public:
+
     Condition()
 	{
 		condition_ = SDL_CreateCond();
@@ -187,12 +193,12 @@ public:
 
     bool wait(Mutex::Lock& lock)
 	{
-        return (SDL_CondWait(condition_, lock.mutex_->mutex_) == 0);
+        return (SDL_CondWait(condition_, lock.mMutex->mMutex) == 0);
     }
     bool wait(Mutex::Lock& lock, unsigned ms)
 	{
 		// TODO for consistency, this function should take seconds
-        return (SDL_CondWaitTimeout(condition_, lock.mutex_->mutex_, ms) == 0);
+        return (SDL_CondWaitTimeout(condition_, lock.mMutex->mMutex, ms) == 0);
 	}
 
     bool notify()
@@ -205,6 +211,7 @@ public:
 	}
 
 private:
+
     SDL_cond* condition_;
 };
 
@@ -212,6 +219,7 @@ private:
 class Semaphore
 {
 public:
+
     Semaphore(unsigned int value)
 	{
 		semaphore_ = SDL_CreateSemaphore(value);
@@ -243,38 +251,41 @@ public:
     class Lock
     {
     public:
+
         Lock(Semaphore& semaphore)
 		{
 			semaphore_ = &semaphore;
-			isLocked_ = false;
+			mIsLocked = false;
 		}
         ~Lock()
 		{
-			if (isLocked_) release();
+			if (mIsLocked) release();
 		}
         
         bool acquire()
 		{
-			return (isLocked_ = semaphore_->acquireLock());
+			return (mIsLocked = semaphore_->acquireLock());
 		}
         bool release()
 		{
-			return semaphore_->releaseLock(); isLocked_ = false;
+			return semaphore_->releaseLock(); mIsLocked = false;
 		}
 
         bool isLocked() const
 		{
-			return isLocked_;
+			return mIsLocked;
 		}
         
     protected:
+
         Semaphore*	semaphore_;
-        bool		isLocked_;
+        bool		mIsLocked;
     };
     
     class ScopedLock : public Lock
     {
     public:
+
         ScopedLock(Semaphore& semaphore) :
 			Lock(semaphore)
 		{
@@ -283,6 +294,7 @@ public:
     };
 
 private:
+
     SDL_sem* semaphore_;
 };
 
diff --git a/src/Moof/Timer.cc b/src/Moof/Timer.cc
index d28d5e8..d17882a 100644
--- a/src/Moof/Timer.cc
+++ b/src/Moof/Timer.cc
@@ -59,43 +59,43 @@ void Timer::init(const Function& function, Scalar seconds, Mode mode)
 {
 	invalidate();
 
-	mode_ = mode;
+	mMode = mode;
 
-	if (mode_ != INVALID)
+	if (mMode != INVALID)
 	{
-		function_ = function;
+		mFunction = function;
 
 		if (mode == ABSOLUTEE)
 		{
-			absolute_ = seconds;
+			mAbsolute = seconds;
 		}
 		else
 		{
-			absolute_ = seconds - getTicks();
-			interval_ = seconds;
+			mAbsolute = seconds - getTicks();
+			mInterval = seconds;
 		}
 
-		id_ = getNewID();
-		timers_.insert(std::pair<unsigned,Timer&>(id_, *this));
+		mId = getNewID();
+		timers_.insert(std::pair<unsigned,Timer&>(mId, *this));
 
-		if (absolute_ < nextFire_) nextFire_ = absolute_;
+		if (mAbsolute < nextFire_) nextFire_ = mAbsolute;
 	}
 }
 
 
 bool Timer::isValid() const
 {
-	return mode_ != INVALID;
+	return mMode != INVALID;
 }
 
 void Timer::invalidate()
 {
-	if (mode_ != INVALID)
+	if (mMode != INVALID)
 	{
-		timers_.erase(id_);
-		mode_ = INVALID;
+		timers_.erase(mId);
+		mMode = INVALID;
 
-		if (isEqual(absolute_, nextFire_)) nextFire_ = findNextFire();
+		if (isEqual(mAbsolute, nextFire_)) nextFire_ = findNextFire();
 	}
 }
 
@@ -104,14 +104,14 @@ void Timer::fire()
 {
 	Scalar t = getTicks();
 
-	if (function_) function_(*this, t);
+	if (mFunction) mFunction(*this, t);
 
 	if (isRepeating())
 	{
-		Scalar absolute = absolute_;
+		Scalar absolute = mAbsolute;
 
-		if (isEqual(absolute_, t, 1.0)) absolute_ += interval_;
-		else absolute_ = interval_ + t;
+		if (isEqual(mAbsolute, t, 1.0)) mAbsolute += mInterval;
+		else mAbsolute = mInterval + t;
 
 		if (isEqual(absolute, nextFire_)) nextFire_ = findNextFire();
 	}
@@ -129,7 +129,7 @@ Scalar Timer::findNextFire()
 
 	for (it = timers_.begin(); it != timers_.end(); ++it)
 	{
-		Scalar absolute = (*it).second.absolute_;
+		Scalar absolute = (*it).second.mAbsolute;
 		if (absolute < nextFire) nextFire = absolute;
 	}
 
@@ -139,7 +139,7 @@ Scalar Timer::findNextFire()
 
 Scalar Timer::getSecondsRemaining() const
 {
-	return absolute_ - getTicks();
+	return mAbsolute - getTicks();
 }
 
 bool Timer::isExpired() const
@@ -149,7 +149,7 @@ bool Timer::isExpired() const
 
 bool Timer::isRepeating() const
 {
-	return mode_ == REPEAT;
+	return mMode == REPEAT;
 }
 
 
diff --git a/src/Moof/Timer.hh b/src/Moof/Timer.hh
index 6c1af56..ed4e2f0 100644
--- a/src/Moof/Timer.hh
+++ b/src/Moof/Timer.hh
@@ -59,7 +59,7 @@ struct Timer
 
 
 	Timer() :
-		mode_(INVALID) {}
+		mMode(INVALID) {}
 
 	Timer(const Function& function, Scalar seconds, Mode mode = NORMAL)
 	{
@@ -115,11 +115,11 @@ private:
 	static unsigned getNewID();
 	static Scalar findNextFire();
 
-	Function	function_;
-	Mode		mode_;
-	Scalar		absolute_;
-	Scalar		interval_;
-	unsigned	id_;
+	Function	mFunction;
+	Mode		mMode;
+	Scalar		mAbsolute;
+	Scalar		mInterval;
+	unsigned	mId;
 
 	static Scalar						nextFire_;
 	static std::map<unsigned,Timer&>	timers_;
diff --git a/src/Moof/Transition.hh b/src/Moof/Transition.hh
index cf1595c..f1e1bcb 100644
--- a/src/Moof/Transition.hh
+++ b/src/Moof/Transition.hh
@@ -46,20 +46,20 @@ namespace Mf {
 template <typename T>
 class Transition : public Layer
 {
-	LayerP	to;
-	LayerP	from;
+	LayerP	mTo;
+	LayerP	mFrom;
 
-	T		interpolator;
+	T		mInterp;
 
-	Engine*	engine;
+	Engine*	mEngine;
 
 public:
 
 	Transition(LayerP t, LayerP f, const T& interp) :
-		to(t),
-		from(f),
-		interpolator(interp),
-		engine(0) {}
+		mTo(t),
+		mFrom(f),
+		mInterp(interp),
+		mEngine(0) {}
 
 	typedef boost::shared_ptr<Transition> Ptr;
 
@@ -69,27 +69,27 @@ public:
 	}
 
 
-	void pushed(Engine& e)
+	void pushed(Engine& engine)
 	{
-		engine = &e;
+		mEngine = &engine;
 	}
 
-	void popped(Engine& e)
+	void popped(Engine& engine)
 	{
-		if (to) e.push(to);
+		if (mTo) engine.push(mTo);
 	}
 
 	void update(Scalar t, Scalar dt)
 	{
-		interpolator.update(t, dt);
+		mInterp.update(t, dt);
 
-		if (from) from->update(t, dt);
-		if (to) to->update(t, dt);
+		if (mFrom) mFrom->update(t, dt);
+		if (mTo) mTo->update(t, dt);
 
-		if (interpolator.isDone())
+		if (mInterp.isDone())
 		{
 			// to should /replace/ this
-			engine->pop(this);
+			mEngine->pop(this);
 		}
 	}
 
@@ -128,27 +128,27 @@ public:
 
 	void draw(Scalar alpha) const
 	{
-		Scalar a = interpolator.getState(alpha);
+		Scalar a = mInterp.getState(alpha);
 		logInfo("draw state: %f", a);
 
 		//glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
-		if (from)
+		if (mFrom)
 		{
 			glPushMatrix();
 			glLoadIdentity();
 			glRotate(180.0 * a, 0.0, 1.0, 0.0);
-			from->draw(alpha);
+			mFrom->draw(alpha);
 			glPopMatrix();
 		}
 			//drawFade(a);
 
-		if (to)
+		if (mTo)
 		{
 			glPushMatrix();
 			glLoadIdentity();
 			glRotate(180.0 * (1.0 - a), 0.0, 1.0, 0.0);
-			to->draw(alpha);
+			mTo->draw(alpha);
 			glPopMatrix();
 		}
 			//drawFade(1.0 - a);
@@ -156,13 +156,13 @@ public:
 
 	bool handleEvent(const Event& event)
 	{
-		if (to)
+		if (mTo)
 		{
-			return to->handleEvent(event);
+			return mTo->handleEvent(event);
 		}
-		else if (from)
+		else if (mFrom)
 		{
-			return from->handleEvent(event);
+			return mFrom->handleEvent(event);
 		}
 		return false;
 	}
diff --git a/src/Moof/Video.cc b/src/Moof/Video.cc
index 8de161a..c49bb1e 100644
--- a/src/Moof/Video.cc
+++ b/src/Moof/Video.cc
@@ -41,7 +41,7 @@ namespace Mf {
 
 Video::Video()
 {
-	init(attribs_);
+	init(mAttribs);
 }
 
 Video::Video(const Attributes& attribs)
@@ -51,23 +51,23 @@ Video::Video(const Attributes& attribs)
 
 Video::Video(const std::string& caption, const std::string& icon)
 {
-	if (attribs_.caption == "Untitled")
+	if (mAttribs.caption == "Untitled")
 	{
-		attribs_.caption = caption;
+		mAttribs.caption = caption;
 	}
-	if (attribs_.icon == "")
+	if (mAttribs.icon == "")
 	{
-		attribs_.icon = icon;
+		mAttribs.icon = icon;
 	}
 
-	init(attribs_);
+	init(mAttribs);
 }
 
 void Video::init(const Attributes& attribs)
 {
-	context_ = 0;
-	flags_ = 0;
-	attribs_ = attribs;
+	mContext = 0;
+	mFlags = 0;
+	mAttribs = attribs;
 
 	setFull(attribs.fullscreen);
 	setResizable(attribs.resizable);
@@ -81,53 +81,53 @@ void Video::init(const Attributes& attribs)
 
 void Video::recreateContext()
 {
-	SDL_FreeSurface(context_);
-	context_ = 0;
-	setVideoMode(attribs_.mode);
+	SDL_FreeSurface(mContext);
+	mContext = 0;
+	setVideoMode(mAttribs.mode);
 }
 
 void Video::setOpenGLAttributes()
 {
-	SDL_GL_SetAttribute(SDL_GL_RED_SIZE,           attribs_.colorBuffer[0]);
-	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE,         attribs_.colorBuffer[1]);
-	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,          attribs_.colorBuffer[2]);
-	SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE,         attribs_.colorBuffer[3]);
-	SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE,        attribs_.frameBuffer);
-	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,       attribs_.doubleBuffer);
-	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,         attribs_.depthBuffer);
-	SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE,       attribs_.stencilBuffer);
-	SDL_GL_SetAttribute(SDL_GL_ACCUM_RED_SIZE,     attribs_.accumBuffer[0]);
-	SDL_GL_SetAttribute(SDL_GL_ACCUM_GREEN_SIZE,   attribs_.accumBuffer[1]);
-	SDL_GL_SetAttribute(SDL_GL_ACCUM_BLUE_SIZE,    attribs_.accumBuffer[2]);
-	SDL_GL_SetAttribute(SDL_GL_ACCUM_ALPHA_SIZE,   attribs_.accumBuffer[3]);
-	SDL_GL_SetAttribute(SDL_GL_STEREO,             attribs_.stereo);
-	SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, attribs_.multisampleBuffers);
-	SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, attribs_.multisampleSamples);
-	SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL,       attribs_.swapControl);
-	SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, attribs_.hardwareonly);
+	SDL_GL_SetAttribute(SDL_GL_RED_SIZE,           mAttribs.colorBuffer[0]);
+	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE,         mAttribs.colorBuffer[1]);
+	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,          mAttribs.colorBuffer[2]);
+	SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE,         mAttribs.colorBuffer[3]);
+	SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE,        mAttribs.frameBuffer);
+	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,       mAttribs.doubleBuffer);
+	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,         mAttribs.depthBuffer);
+	SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE,       mAttribs.stencilBuffer);
+	SDL_GL_SetAttribute(SDL_GL_ACCUM_RED_SIZE,     mAttribs.accumBuffer[0]);
+	SDL_GL_SetAttribute(SDL_GL_ACCUM_GREEN_SIZE,   mAttribs.accumBuffer[1]);
+	SDL_GL_SetAttribute(SDL_GL_ACCUM_BLUE_SIZE,    mAttribs.accumBuffer[2]);
+	SDL_GL_SetAttribute(SDL_GL_ACCUM_ALPHA_SIZE,   mAttribs.accumBuffer[3]);
+	SDL_GL_SetAttribute(SDL_GL_STEREO,             mAttribs.stereo);
+	SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, mAttribs.multisampleBuffers);
+	SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, mAttribs.multisampleSamples);
+	SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL,       mAttribs.swapControl);
+	SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, mAttribs.hardwareonly);
 }
 
 
 Video::~Video()
 {
-	SDL_FreeSurface(context_);
+	SDL_FreeSurface(mContext);
 }
 
 
 void Video::setVideoMode(const long mode[3])
 {
-	if (mode != attribs_.mode || !context_)
+	if (mode != mAttribs.mode || !mContext)
 	{
-		if (context_) SDL_FreeSurface(context_);
+		if (mContext) SDL_FreeSurface(mContext);
 
-		context_ = SDL_SetVideoMode(mode[0], mode[1], mode[2],
-				SDL_OPENGL | flags_);
+		mContext = SDL_SetVideoMode(mode[0], mode[1], mode[2],
+				SDL_OPENGL | mFlags);
 
-		if (context_)
+		if (mContext)
 		{
-			attribs_.mode[0] = mode[0];
-			attribs_.mode[1] = mode[1];
-			attribs_.mode[2] = mode[2];
+			mAttribs.mode[0] = mode[0];
+			mAttribs.mode[1] = mode[1];
+			mAttribs.mode[2] = mode[2];
 
 #if defined(_WIN32) || defined (_WIN64) || defined(__WIN32__)
 			// on win32, creating a new context via SDL_SetVideoMode will wipe
@@ -143,13 +143,13 @@ void Video::setVideoMode(const long mode[3])
 
 Video::Attributes Video::getAttributes() const
 {
-	return attribs_;
+	return mAttribs;
 }
 
 
 void Video::resize(int width, int height)
 {
-	long mode[] = {width, height, attribs_.mode[2]};
+	long mode[] = {width, height, mAttribs.mode[2]};
 	setVideoMode(mode);
 }
 
@@ -161,15 +161,15 @@ bool Video::iconify()
 
 void Video::setCaption(const std::string& caption)
 {
-	attribs_.caption = caption;
+	mAttribs.caption = caption;
 	SDL_WM_SetCaption(caption.c_str(), 0);
 }
 
 void Video::setIcon()
 {
-	if (attribs_.icon != "")
+	if (mAttribs.icon != "")
 	{
-		SDL_Surface* icon = IMG_Load(attribs_.icon.c_str());
+		SDL_Surface* icon = IMG_Load(mAttribs.icon.c_str());
 		if (icon)
 		{
 			SDL_WM_SetIcon(icon, 0);
@@ -180,27 +180,27 @@ void Video::setIcon()
 
 std::string Video::getCaption() const
 {
-	return attribs_.caption;
+	return mAttribs.caption;
 }
 
 
 void Video::setFull(bool full)
 {
-	if (full != isFull() || !context_)
+	if (full != isFull() || !mContext)
 	{
-		if (context_)
+		if (mContext)
 		{
-			flags_ ^= SDL_FULLSCREEN;
+			mFlags ^= SDL_FULLSCREEN;
 
 #if defined(linux) || defined(__linux) || defined(__linux__)
-			if (SDL_WM_ToggleFullScreen(context_) == 0)
+			if (SDL_WM_ToggleFullScreen(mContext) == 0)
 #endif
 			recreateContext();
 		}
 		else
 		{
-			if (full) flags_ |= SDL_FULLSCREEN;
-			else flags_ &= ~SDL_FULLSCREEN;
+			if (full) mFlags |= SDL_FULLSCREEN;
+			else mFlags &= ~SDL_FULLSCREEN;
 		}
 	}
 }
@@ -212,7 +212,7 @@ void Video::toggleFull()
 
 bool Video::isFull() const
 {
-	return flags_ & SDL_FULLSCREEN;
+	return mFlags & SDL_FULLSCREEN;
 }
 
 
@@ -234,17 +234,17 @@ bool Video::isCursorVisible() const
 
 void Video::setResizable(bool resizable)
 {
-	if (resizable != isResizable() || !context_)
+	if (resizable != isResizable() || !mContext)
 	{
-		if (context_)
+		if (mContext)
 		{
-			flags_ ^= SDL_RESIZABLE;
+			mFlags ^= SDL_RESIZABLE;
 			recreateContext();
 		}
 		else
 		{
-			if (resizable) flags_ |= SDL_RESIZABLE;
-			else flags_ &= ~SDL_RESIZABLE;
+			if (resizable) mFlags |= SDL_RESIZABLE;
+			else mFlags &= ~SDL_RESIZABLE;
 		}
 	}
 }
@@ -256,7 +256,7 @@ void Video::toggleResizable()
 
 bool Video::isResizable() const
 {
-	return flags_ & SDL_RESIZABLE;
+	return mFlags & SDL_RESIZABLE;
 }
 
 
@@ -290,12 +290,12 @@ void Video::swap()
 
 int Video::getWidth() const
 {
-	return context_->w;
+	return mContext->w;
 }
 
 int Video::getHeight() const
 {
-	return context_->h;
+	return mContext->h;
 }
 
 
diff --git a/src/Moof/Video.hh b/src/Moof/Video.hh
index 5f56f9e..736832f 100644
--- a/src/Moof/Video.hh
+++ b/src/Moof/Video.hh
@@ -45,8 +45,10 @@ class Video;
 typedef boost::shared_ptr<Video> VideoP;
 
 
-struct Video
+class Video
 {
+public:
+
 	struct Attributes
 	{
 		// OpenGL attributes
@@ -75,21 +77,6 @@ struct Video
 	};
 
 
-private:
-
-	void init(const Attributes& attribs);
-
-	void recreateContext();
-	void setOpenGLAttributes();
-
-	void setIcon();
-
-	SDL_Surface* context_;
-	unsigned flags_;
-	Attributes attribs_;
-
-public:
-
 	static VideoP alloc(const std::string& caption, const std::string& icon)
 	{
 		return VideoP(new Video(caption, icon));
@@ -142,6 +129,21 @@ public:
 			throw *this;
 		}
 	};
+
+private:
+
+	void init(const Attributes& attribs);
+
+	void recreateContext();
+	void setOpenGLAttributes();
+
+	void setIcon();
+
+	// TODO this implementation should be hidden
+
+	SDL_Surface*	mContext;
+	unsigned		mFlags;
+	Attributes		mAttribs;
 };
 
 
diff --git a/src/Scene.cc b/src/Scene.cc
index cffd382..bad59bf 100644
--- a/src/Scene.cc
+++ b/src/Scene.cc
@@ -324,13 +324,13 @@ struct Scene::Impl : public Mf::Mippleton<Impl>
 		Mf::Settings::getInstance().get("detail", detail);
 		script.push(detail); script.set("detail");
 
-		script.push(Quad::LEFT);  script.set("LEFT");
-		script.push(Quad::RIGHT); script.set("RIGHT");
-		script.push(Quad::TOP);   script.set("TOP");
-
 		script.push(X); script.set("X");
 		script.push(Y); script.set("Y");
 		script.push(Z); script.set("Z");
+
+		script.push(Quad::LEFT);  script.set("LEFT");
+		script.push(Quad::RIGHT); script.set("RIGHT");
+		script.push(Quad::TOP);   script.set("TOP");
 	}
 
 
@@ -447,7 +447,7 @@ struct Scene::Impl : public Mf::Mippleton<Impl>
 
 	int rotate(Mf::Script& script)
 	{
-		Mf::Script::Value axis = script[1].requireString();
+		Mf::Script::Value axis = script[1].requireNumber();
 		Mf::Script::Value angle = script[2].requireNumber();
 
 		size_t index = 0;
@@ -463,10 +463,7 @@ struct Scene::Impl : public Mf::Mippleton<Impl>
 
 	int setTexture(Mf::Script& script)
 	{
-		Mf::Script::Value name = script[1].requireString();
-
-		name.get(texture);
-
+		script[1].requireString().get(texture);
 		return 0;
 	}
 
@@ -500,9 +497,8 @@ struct Scene::Impl : public Mf::Mippleton<Impl>
 		height = nTiles / width;
 		indices.resize(height);
 
-		// the indices are stored upside-down in the scene file so that they
-		// are easier to edit as text, so we'll need to load them last row
-		// first
+		// the indices are stored upside-down in the scene file so that they are
+		// easier to edit as text, so we'll need to load them last row first
 
 		i = 1;
 		for (h = height - 1; h >= 0; --h)
@@ -628,17 +624,17 @@ struct Scene::Impl : public Mf::Mippleton<Impl>
 
 Scene::Scene(const std::string& name) :
 	// pass through
-	impl_(Scene::Impl::getInstance(name)) {}
+	mImpl(Scene::Impl::getInstance(name)) {}
 
 
 void Scene::draw(Mf::Scalar alpha) const
 {
-	impl_->octree->draw(alpha);
+	mImpl->octree->draw(alpha);
 }
 
 void Scene::drawIfVisible(Mf::Scalar alpha, const Mf::Frustum& frustum) const
 {
-	impl_->octree->drawIfVisible(alpha, frustum);
+	mImpl->octree->drawIfVisible(alpha, frustum);
 }
 
 
@@ -646,8 +642,8 @@ bool Scene::checkForCollision(Character& character)
 {
 	std::list< boost::shared_ptr<Impl::Quad> > objects;
 	//std::list<Mf::Octree<Impl::Quad>::InsertableP> objects;
-	impl_->octree->getNearbyObjects(objects, character);
-	impl_->maximumBounds.draw();
+	mImpl->octree->getNearbyObjects(objects, character);
+	mImpl->maximumBounds.draw();
 
 	Mf::logDebug("nearby objects: %d", objects.size());
 	return false;
diff --git a/src/Scene.hh b/src/Scene.hh
index 24a790f..b858c64 100644
--- a/src/Scene.hh
+++ b/src/Scene.hh
@@ -47,7 +47,7 @@ typedef boost::shared_ptr<Scene> SceneP;
 class Scene : public Mf::Cullable, public Mf::Drawable, public Mf::Resource
 {
 	class Impl;
-	boost::shared_ptr<Impl> impl_;
+	boost::shared_ptr<Impl> mImpl;
 
 public:
 
diff --git a/src/Tilemap.cc b/src/Tilemap.cc
index 6554752..232d003 100644
--- a/src/Tilemap.cc
+++ b/src/Tilemap.cc
@@ -37,12 +37,12 @@ struct Tilemap::Impl : public Mf::Mippleton<Impl>
 {
 	Impl(const std::string& name) :
 		Mf::Mippleton<Impl>(name),
-		magFilter_(GL_NEAREST),
-		minFilter_(GL_NEAREST),
-		nTilesS_(1),
-		nTilesT_(1),
-		wrapS_(GL_CLAMP),
-		wrapT_(GL_CLAMP)
+		mMagFilter(GL_NEAREST),
+		mMinFilter(GL_NEAREST),
+		mTilesS(1),
+		mTilesT(1),
+		mWrapS(GL_CLAMP),
+		mWrapT(GL_CLAMP)
 	{
 		loadFromFile();
 	}
@@ -83,36 +83,36 @@ struct Tilemap::Impl : public Mf::Mippleton<Impl>
 		Mf::Script::Value top = script[-1];
 
 		globals.pushField("tiles_s");
-		top.get(nTilesS_);
+		top.get(mTilesS);
 
 		globals.pushField("tiles_t");
-		top.get(nTilesT_);
+		top.get(mTilesT);
 
 		globals.pushField("min_filter");
-		top.get(minFilter_);
+		top.get(mMinFilter);
 
 		globals.pushField("mag_filter");
-		top.get(magFilter_);
+		top.get(mMagFilter);
 
 		globals.pushField("wrap_s");
-		top.get(wrapS_);
+		top.get(mWrapS);
 
 		globals.pushField("wrap_t");
-		top.get(wrapT_);
+		top.get(mWrapT);
 	}
 
 
 	bool getTileCoords(Tilemap::Index index, Mf::Scalar coords[8]) const
 	{
 		// make sure the index represents a real tile
-		if (index >= nTilesS_ * nTilesT_) return false;
+		if (index >= mTilesS * mTilesT) return false;
 
-		Mf::Scalar w = 1.0 / Mf::Scalar(nTilesS_);
-		Mf::Scalar h = 1.0 / Mf::Scalar(nTilesT_);
+		Mf::Scalar w = 1.0 / Mf::Scalar(mTilesS);
+		Mf::Scalar h = 1.0 / Mf::Scalar(mTilesT);
 
-		coords[0] = Mf::Scalar(index % nTilesS_) * w;
-		coords[1] = (Mf::Scalar(nTilesT_ - 1) -
-				Mf::Scalar(index / nTilesS_)) * h;
+		coords[0] = Mf::Scalar(index % mTilesS) * w;
+		coords[1] = (Mf::Scalar(mTilesT - 1) -
+				Mf::Scalar(index / mTilesS)) * h;
 		coords[2] = coords[0] + w;
 		coords[3] = coords[1];
 		coords[4] = coords[2];
@@ -124,30 +124,30 @@ struct Tilemap::Impl : public Mf::Mippleton<Impl>
 	}
 
 
-	GLuint		magFilter_;
-	GLuint		minFilter_;
-	unsigned	nTilesS_;
-	unsigned	nTilesT_;
-	GLuint		wrapS_;
-	GLuint		wrapT_;
+	GLuint		mMagFilter;
+	GLuint		mMinFilter;
+	unsigned	mTilesS;
+	unsigned	mTilesT;
+	GLuint		mWrapS;
+	GLuint		mWrapT;
 };
 
 
 Tilemap::Tilemap(const std::string& name) :
 	Texture(name),
-	impl_(Tilemap::Impl::getInstance(name))
+	mImpl(Tilemap::Impl::getInstance(name))
 {
-	setMinFilter(impl_->minFilter_);
-	setMagFilter(impl_->magFilter_);
-	setWrapS(impl_->wrapS_);
-	setWrapT(impl_->wrapT_);
+	setMinFilter(mImpl->mMinFilter);
+	setMagFilter(mImpl->mMagFilter);
+	setWrapS(mImpl->mWrapS);
+	setWrapT(mImpl->mWrapT);
 }
 
 
 bool Tilemap::getTileCoords(Index index, Mf::Scalar coords[8]) const
 {
 	// pass through
-	return impl_->getTileCoords(index, coords);
+	return mImpl->getTileCoords(index, coords);
 }
 
 bool Tilemap::getTileCoords(Index index, Mf::Scalar coords[8],
diff --git a/src/Tilemap.hh b/src/Tilemap.hh
index 163b45a..671780a 100644
--- a/src/Tilemap.hh
+++ b/src/Tilemap.hh
@@ -50,6 +50,7 @@
 class Tilemap : public Mf::Texture
 {
 public:
+
 	/**
 	 * Possible orientations for texture coordinates.
 	 */
@@ -97,8 +98,9 @@ public:
 	static std::string getPath(const std::string& name);
 
 private:
+
 	class Impl;
-	boost::shared_ptr<Impl> impl_;
+	boost::shared_ptr<Impl> mImpl;
 };
 
 
diff --git a/src/TilemapFont.hh b/src/TilemapFont.hh
index 059b94a..98a3a13 100644
--- a/src/TilemapFont.hh
+++ b/src/TilemapFont.hh
@@ -40,6 +40,7 @@
 class TilemapFont : public Tilemap
 {
 public:
+
 	TilemapFont();
 
 	void getTileCoords(char symbol, Mf::Scalar coords[8],
diff --git a/src/TitleLayer.cc b/src/TitleLayer.cc
index a12168a..11c624d 100644
--- a/src/TitleLayer.cc
+++ b/src/TitleLayer.cc
@@ -34,24 +34,24 @@
 #include "TitleLayer.hh"
 
 
-void TitleLayer::pushed(Mf::Engine& e)
+void TitleLayer::pushed(Mf::Engine& engine)
 {
-	engine = &e;
+	mEngine = &engine;
 
 	Mf::Scalar coeff[] = {0.0, 1.0};
-	fadeIn.init(coeff, 0.1);
+	mFadeIn.init(coeff, 0.1);
 
-	gameLayer = GameLayer::alloc();
+	mGameLayer = GameLayer::alloc();
 }
 
 void TitleLayer::update(Mf::Scalar t, Mf::Scalar dt)
 {
-	if (!fadeIn.isDone()) fadeIn.update(t, dt);
+	if (!mFadeIn.isDone()) mFadeIn.update(t, dt);
 }
 
 void TitleLayer::draw(Mf::Scalar alpha) const
 {
-	glClearColor(0.0, 0.0, fadeIn.getState(alpha), 1.0);
+	glClearColor(0.0, 0.0, mFadeIn.getState(alpha), 1.0);
 	glClear(GL_COLOR_BUFFER_BIT);
 }
 
@@ -60,16 +60,16 @@ bool TitleLayer::handleEvent(const Mf::Event& event)
 	switch (event.type)
 	{
 		case SDL_KEYUP:
-			Mf::LayerP titleLayer = engine->pop(this);
-			//engine->pushLayer(GameLayer::alloc());
+			Mf::LayerP titleLayer = mEngine->pop(this);
+			//mEngine->pushLayer(GameLayer::alloc());
 
 			Mf::Scalar coeff[] = {0.0, 1.0};
 			Mf::Lerp interp(coeff, 0.2);
 
-			//Mf::LayerP gameLayer = GameLayer::alloc();
+			//Mf::LayerP mGameLayer = GameLayer::alloc();
 			Mf::Transition<Mf::Lerp>::Ptr transition =
-				Mf::Transition<Mf::Lerp>::alloc(gameLayer, titleLayer, interp);
-			engine->push(transition);
+				Mf::Transition<Mf::Lerp>::alloc(mGameLayer, titleLayer, interp);
+			mEngine->push(transition);
 			return true;
 	}
 
diff --git a/src/TitleLayer.hh b/src/TitleLayer.hh
index da4b4c5..e3814b2 100644
--- a/src/TitleLayer.hh
+++ b/src/TitleLayer.hh
@@ -54,10 +54,10 @@ struct TitleLayer : public Mf::Layer
 
 private:
 
-	Mf::Lerp fadeIn;
-	Mf::Engine* engine;
+	Mf::Lerp 		mFadeIn;
+	Mf::Engine*		mEngine;
 
-	Mf::LayerP gameLayer;
+	Mf::LayerP		mGameLayer;
 };
 
 
diff --git a/src/Typesetter.hh b/src/Typesetter.hh
index 3c633f7..82d94fa 100644
--- a/src/Typesetter.hh
+++ b/src/Typesetter.hh
@@ -37,6 +37,7 @@
 class Typesetter
 {
 public:
+
 	Typesetter();
 
 	void setLineSpacing(Mf::Scalar spacing);
@@ -44,9 +45,10 @@ public:
 	void print(const std::string& format, ...);
 
 private:
-	Mf::Scalar leftBound;
-	Mf::Scalar topBound;
-	Mf::Scalar lineSpacing;
+
+	Mf::Scalar mLeftBound;
+	Mf::Scalar mTopBound;
+	Mf::Scalar mLineSpacing;
 };