vladislavbelov
ffc4a56b9f
Fixes #6846 Differential Revision: https://code.wildfiregames.com/D5185 This was SVN commit r27965.
84 lines
2.5 KiB
C++
84 lines
2.5 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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#include "Vector4D.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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CPlane(const CVector4D& coeffs) : m_Norm(coeffs.X, coeffs.Y, coeffs.Z), m_Dist(coeffs.W) { }
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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 lies
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PLANESIDE ClassifyPoint(const CVector3D& point) const;
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//returns true if this point is on the back side
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inline bool IsPointOnBackSide(const CVector3D& point) const;
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//solves the plane equation for a particular point
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inline 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) const;
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bool FindRayIntersection(const CVector3D& start, const CVector3D& direction, CVector3D* intsect) const;
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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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static const float m_EPS;
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};
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float CPlane::DistanceToPlane(const CVector3D& point) const
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{
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return m_Norm.X * point.X + m_Norm.Y * point.Y + m_Norm.Z * point.Z + m_Dist;
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}
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bool CPlane::IsPointOnBackSide(const CVector3D& point) const
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{
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return DistanceToPlane(point) < -m_EPS;
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}
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#endif
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