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00001 
00007 /* Copyright, 2001 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 #include "std3d.h"
00027 
00028 #include "3d/vegetable_clip_block.h"
00029 
00030 
00031 namespace NL3D 
00032 {
00033 
00034 
00035 // ***************************************************************************
00036 CVegetableClipBlock::CVegetableClipBlock()
00037 {
00038         _Empty= true;
00039         _RenderNext= NULL;
00040         _NumIgs= 0;
00041 }
00042 
00043 
00044 // ***************************************************************************
00045 void                    CVegetableClipBlock::extendBBoxOnly(const CVector &vec)
00046 {
00047         if( !_BBox.include(vec) )
00048         {
00049                 _BBox.extend(vec);
00050         }
00051 }
00052 
00053 
00054 // ***************************************************************************
00055 void                    CVegetableClipBlock::updateSphere()
00056 {
00057         _BSphere.Center= _BBox.getCenter();
00058         _BSphere.Radius= _BBox.getRadius();
00059 }
00060 
00061 // ***************************************************************************
00062 void                    CVegetableClipBlock::extendSphere(const CVector &vec)
00063 {
00064         if(_Empty)
00065         {
00066                 _Empty= false;
00067                 _BBox.setCenter(vec);
00068                 _BBox.setHalfSize(CVector::Null);
00069                 _BSphere.Center= vec;
00070                 _BSphere.Radius= 0;
00071         }
00072         else
00073         {
00074                 extendBBoxOnly(vec);
00075                 updateSphere();
00076         }
00077 
00078 }
00079 
00080 
00081 // ***************************************************************************
00082 bool                    CVegetableClipBlock::clip(const std::vector<CPlane>     &pyramid)
00083 {
00084         if(_Empty) 
00085                 return false;
00086 
00087         for(uint i=0;i<pyramid.size();i++)
00088         {
00089                 // If entirely out.
00090                 if(!_BSphere.clipBack( pyramid[i] ))
00091                 {
00092                         return false;
00093                 }
00094         }
00095 
00096         return true;
00097 }
00098 
00099 
00100 
00101 } // NL3D
vegetable_clip_block.cpp
