57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
/**
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* =========================================================================
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* File : Plane.h
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* Project : 0 A.D.
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* Description : A Plane in R3 and several utility methods.
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* =========================================================================
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*/
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// Note that the format used for the plane equation is
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// Ax + By + Cz + D = 0, where <A,B,C> is the normal vector.
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#ifndef INCLUDED_PLANE
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#define INCLUDED_PLANE
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#include "Vector3D.h"
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enum PLANESIDE
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{
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PS_FRONT,
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PS_BACK,
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PS_ON
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};
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class CPlane
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{
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public:
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CPlane ();
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//sets the plane equation from 3 points on that plane
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void Set (const CVector3D &p1, const CVector3D &p2, const CVector3D &p3);
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//sets the plane equation from a normal and a point on
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//that plane
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void Set (const CVector3D &norm, const CVector3D &point);
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//normalizes the plane equation
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void Normalize ();
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//returns the side of the plane on which this point
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//lies.
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PLANESIDE ClassifyPoint (const CVector3D &point) const;
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//solves the plane equation for a particular point
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float DistanceToPlane (const CVector3D &point) const;
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//calculates the intersection point of a line with this
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//plane. Returns false if there is no intersection
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bool FindLineSegIntersection (const CVector3D &start, const CVector3D &end, CVector3D *intsect);
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bool FindRayIntersection (CVector3D &start, CVector3D &direction, CVector3D *intsect);
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public:
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CVector3D m_Norm; //normal vector of the plane
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float m_Dist; //Plane distance (ie D in the plane eq.)
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};
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#endif
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