namespace Mf {
-class Plane
+class Aabb;
+class Sphere;
+
+
+struct Plane
{
- Vector4 components;
+ Vector3 normal;
+ Scalar d;
+
+ typedef enum
+ {
+ NEGATIVE = -1,
+ INTERSECT = 0,
+ POSITIVE = 1
+ } Halfspace;
+
+ Plane() {}
+ Plane(const Vector3& vector, Scalar scalar) :
+ normal(vector),
+ d(scalar) {}
+ Plane(Scalar a, Scalar b, Scalar c, Scalar scalar) :
+ normal(a, b, c),
+ d(scalar) {}
+
+
+ void normalize()
+ {
+ Scalar mag = normal.length();
+
+ normal /= mag;
+ d /= mag;
+ }
+
+ inline Scalar getDistanceToPoint(const Vector3& point) const
+ {
+ return cml::dot(point, normal) + d;
+ }
+
+ inline Halfspace intersectsPoint(const Vector3& point) const
+ {
+ Scalar distance = getDistanceToPoint(point);
+
+ if (isEqual(distance, 0.0)) return INTERSECT;
+ else if (distance < 0.0) return NEGATIVE;
+ else return POSITIVE;
+ }
-public:
+ Halfspace intersectsAabb(const Aabb& aabb) const;
+ Halfspace intersectsSphere(const Sphere& sphere) const;
};