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plane_inline.hGo to the documentation of this file.00001
00007 /* Copyright, 2000 Nevrax Ltd.
00008 *
00009 * This file is part of NEVRAX NEL.
00010 * NEVRAX NEL is free software; you can redistribute it and/or modify
00011 * it under the terms of the GNU General Public License as published by
00012 * the Free Software Foundation; either version 2, or (at your option)
00013 * any later version.
00014
00015 * NEVRAX NEL is distributed in the hope that it will be useful, but
00016 * WITHOUT ANY WARRANTY; without even the implied warranty of
00017 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00018 * General Public License for more details.
00019
00020 * You should have received a copy of the GNU General Public License
00021 * along with NEVRAX NEL; see the file COPYING. If not, write to the
00022 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
00023 * MA 02111-1307, USA.
00024 */
00025
00026 #ifndef NL_PLANE_INLINE_H
00027 #define NL_PLANE_INLINE_H
00028
00029
00030 namespace NLMISC
00031 {
00032
00033
00034 //============================================================
00035 inline CVector CPlane::getNormal() const
00036 {
00037 return CVector(a,b,c);
00038 }
00039 //============================================================
00040 inline float CPlane::distance(const CVector &v) const
00041 {
00042 CPlane p= normed();
00043 return (float)fabs(p*v);
00044 }
00045 //============================================================
00046 inline float CPlane::operator*(const CVector &p) const
00047 {
00048 return a*p.x + b*p.y + c*p.z + d;
00049 }
00050 //============================================================
00051 inline CVector CPlane::intersect(const CVector &a,const CVector &b) const
00052 {
00053 float decal;
00054 float da= (*this)*a;
00055 float db= (*this)*b;
00056 if(db-da ==0)
00057 return a;
00058 decal= ( 0-da ) / ( db - da );
00059 return a + (b-a)*decal;
00060 }
00061 //============================================================
00062 inline CVector CPlane::project(const CVector &p0) const
00063 {
00064 return intersect(p0, p0+getNormal());
00065 }
00066
00067 //============================================================
00068 inline void CPlane::normalize()
00069 {
00070 float n= getNormal().norm();
00071 if(n)
00072 {
00073 float oon= 1.0f/n;
00074 a*= oon;
00075 b*= oon;
00076 c*= oon;
00077 d*= oon;
00078 }
00079 }
00080 //============================================================
00081 inline CPlane CPlane::normed() const
00082 {
00083 CPlane ret= *this;
00084 ret.normalize();
00085 return ret;
00086 }
00087
00088
00089 }
00090
00091
00092 #endif // NL_PLANE_H
00093
00094 /* End of plane.h */
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