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diff --git a/src/Moof/Plane.cc b/src/Moof/Plane.cc
new file mode 100644
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--- /dev/null
+++ b/src/Moof/Plane.cc
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+
+/*******************************************************************************
+
+ 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.
+
+*******************************************************************************/
+
+#include "Aabb.hh"
+#include "Plane.hh"
+#include "Sphere.hh"
+
+
+namespace Mf {
+
+
+Plane::Halfspace Plane::intersectsAabb(const Aabb& aabb) const
+{
+	Vector3 corners[8];
+	int nPositive = 8;
+
+	aabb.getCorners(corners);
+
+	for (int i = 0; i < 8; ++i)
+	{
+		if (intersectsPoint(corners[i]) == NEGATIVE)
+		{
+			--nPositive;
+		}
+	}
+
+	if (nPositive == 0)      return NEGATIVE;
+	else if (nPositive == 8) return POSITIVE;
+	else                     return INTERSECT;
+}
+
+Plane::Halfspace Plane::intersectsSphere(const Sphere& sphere) const
+{
+	Scalar distance = getDistanceToPoint(sphere.point);
+
+	if (distance < -sphere.radius)     return NEGATIVE;
+	else if (distance < sphere.radius) return INTERSECT;
+	else                               return POSITIVE;
+}
+
+
+} // namespace Mf
+
+/** vim: set ts=4 sw=4 tw=80: *************************************************/
+