70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* A Plane in R3 and several utility methods.
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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 (const CVector3D &start, const 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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