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mrm_level_detail.cppGo to the documentation of this file.00001 00007 /* Copyright, 2000-2002 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 00027 #include "std3d.h" 00028 00029 #include "3d/mrm_level_detail.h" 00030 00031 00032 namespace NL3D 00033 { 00034 00035 00036 // *************************************************************************** 00037 void CMRMLevelDetail::compileDistanceSetup() 00038 { 00039 // Compute _OODistDelta. 00040 OODistanceDelta= 1.0f / (DistanceCoarsest - DistanceFinest); 00041 /* Compute exponent pow, such that 0.5= dMiddle^pow; 00042 ie 0.5= e(ln dMiddle * pow) 00043 */ 00044 float dMiddle= (DistanceCoarsest - DistanceMiddle) * OODistanceDelta; 00045 DistancePow= (float)(log(0.5) / log(dMiddle)); 00046 } 00047 00048 00049 // *************************************************************************** 00050 float CMRMLevelDetail::getLevelDetailFromDist(float dist) 00051 { 00052 if(dist <= DistanceFinest) 00053 return 1; 00054 if(dist >= DistanceCoarsest) 00055 return 0; 00056 00057 float d= (DistanceCoarsest - dist) * OODistanceDelta; 00058 return (float)pow(d, DistancePow); 00059 } 00060 00061 00062 } // NL3D |
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