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plane_inline.h

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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 */