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//----------------------------------------------------------------------------- 
// File: AS_Plane.h 
//----------------------------------------------------------------------------- 
 
#ifndef __AS_PLANE_H__ 
#define __AS_PLANE_H__ 
 
 
// Classes: ******************************************************************* 
typedef class AS_PLANE 
{ 
	public: 
		AS_3D_VECTOR vN; 
		float fD; 
 
		AS_PLANE(float fA = 1.0f, float fB = 0.0f, float fC = 0.0f, float fD1 = 0.0f) 
		{ 
				vN = AS_3D_VECTOR(fA, fB, fC).Normalize(); 
				fD = fD1; 
		} 
		AS_PLANE(AS_3D_VECTOR &vVertexA, AS_3D_VECTOR &vVertexB, AS_3D_VECTOR &vVertexC) 
		{ 
			AS_3D_VECTOR vNormalA = ((vVertexC-vVertexA).Normalize()); 
			AS_3D_VECTOR vNormalB = ((vVertexC-vVertexB).Normalize()); 
			vN = (vNormalA.CrossProduct(vNormalB)).Normalize(); 
			fD = -vVertexA.DotProduct(vN); 
		} 
 
		AS_PLANE &operator = (AS_PLANE &Plane) 
		{ 
			vN = Plane.vN; 
			fD = Plane.fD; 
			return *this; 
		} 
 
		// Boolean Operators: 
		BOOL operator == (AS_PLANE &Plane) 
		{ 
			return vN == Plane.vN && fD == Plane.fD; 
		} 
		BOOL operator != (AS_PLANE &Plane) 
		{ 
			return !(*this == Plane); 
		} 
 
		BOOL PointOnPlane(AS_3D_VECTOR &vPoint) 
		{ 
			return DistanceToPlane(vPoint) == 0; 
		} 
		float DistanceToPlane(AS_3D_VECTOR &vPoint) 
		{ 
			return ((vN.DotProduct(vPoint))+fD); 
		} 
		AS_3D_VECTOR RayIntersection(AS_3D_VECTOR &vRayPos, AS_3D_VECTOR &vRayDir) 
		{ 
			float fA = vN.DotProduct(vRayDir); 
			if(!fA) 
				return vRayPos;	// Error line parallel to plane 
			 
			return vRayPos-vRayDir*(DistanceToPlane(vRayPos)/fA); 
		} 
 
} AS_PLANE; 
/////////////////////////////////////////////////////////////////////////////// 
 
 
#endif // __AS_PLANE_H__