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Documentation                       Search   light.cpp Go to the documentation of this file. /* Copyright, 2001 Nevrax Ltd. * * This file is part of NEVRAX NEL. * NEVRAX NEL is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * NEVRAX NEL is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * You should have received a copy of the GNU General Public License * along with NEVRAX NEL; see the file COPYING. If not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, * MA 02111-1307, USA. */ #include "std3d.h" #include "3d/light.h" using namespace NLMISC; namespace NL3D { // *************************************************************************** void CLight::setupDirectional (const CRGBA& ambiant, const CRGBA& diffuse, const CRGBA& specular, const CVector& direction, float constant, float linear, float quadratic) { // Set the mode setMode (DirectionalLight); // Set the colors setAmbiant (ambiant); setDiffuse (diffuse); setSpecular (specular); // Set the direction setDirection (direction); // Set attenuation setConstantAttenuation (constant); setLinearAttenuation (linear); setQuadraticAttenuation (quadratic); } // *************************************************************************** void CLight::setupPointLight (const CRGBA& ambiant, const CRGBA& diffuse, const CRGBA& specular, const CVector& position, const CVector& direction, float constant, float linear, float quadratic) { // Set the mode setMode (PointLight); // Set the colors setAmbiant (ambiant); setDiffuse (diffuse); setSpecular (specular); // Set the position and direction setPosition (position); setDirection (direction); // Set attenuation setConstantAttenuation (constant); setLinearAttenuation (linear); setQuadraticAttenuation (quadratic); } // *************************************************************************** void CLight::setupSpotLight (const CRGBA& ambiant, const CRGBA& diffuse, const CRGBA& specular, const CVector& position, const CVector& direction, float exponent, float cutoff, float constant, float linear, float quadratic) { // Set the mode setMode (SpotLight); // Set the colors setAmbiant (ambiant); setDiffuse (diffuse); setSpecular (specular); // Set the position and direction setPosition (position); setDirection (direction); // Set spotlight parameters setExponent (exponent); setCutoff (cutoff); // Set attenuation setConstantAttenuation (constant); setLinearAttenuation (linear); setQuadraticAttenuation (quadratic); } // *************************************************************************** void CLight::setupAttenuation (float farAttenuationBegin, float farAttenuationEnd) { _ConstantAttenuation=1.f; _QuadraticAttenuation=(float)(0.1/(0.9*farAttenuationBegin*farAttenuationBegin)); _LinearAttenuation=(float)(0.1/(0.9*farAttenuationBegin)); // blend factor float factor = (0.1f*_LinearAttenuation*farAttenuationEnd-0.1f*_QuadraticAttenuation*farAttenuationEnd*farAttenuationEnd); if (factor == 0.0f) factor = 0.0001f; factor = (0.9f-0.1f*_QuadraticAttenuation*farAttenuationEnd*farAttenuationEnd)/factor; if ((factor<0.f)||(factor>1.f)) { // Better factor float d0_1Lin=1.f / ( _ConstantAttenuation + _LinearAttenuation*farAttenuationEnd ); float d0_1Quad=1.f / ( _ConstantAttenuation + _QuadraticAttenuation*farAttenuationEnd*farAttenuationEnd ); // Better if (fabs (d0_1Lin-0.1f)<fabs (d0_1Quad-0.1f)) _QuadraticAttenuation=0.f; else _LinearAttenuation=0.f; } else { _LinearAttenuation*=factor; _QuadraticAttenuation*=(1.f-factor); } #ifdef NL_DEBUG // Should be near previous result float d1_0=1.f / ( _ConstantAttenuation + _LinearAttenuation*0.f + _QuadraticAttenuation*0.f*0.f ); float d0_9=1.f / ( _ConstantAttenuation + _LinearAttenuation*farAttenuationBegin + _QuadraticAttenuation*farAttenuationBegin*farAttenuationBegin ); float d0_1=1.f / ( _ConstantAttenuation + _LinearAttenuation*farAttenuationEnd + _QuadraticAttenuation*farAttenuationEnd*farAttenuationEnd ); #endif // NL_DEBUG*/ } // *************************************************************************** void CLight::setupSpotExponent (float hotSpotAngle) { float divid=(float)log (cos (hotSpotAngle)); if (divid==0.f) divid=0.0001f; setExponent ((float)(log (0.9)/divid)); } // *************************************************************************** void CLight::setNoAttenuation () { _ConstantAttenuation=1.f; _QuadraticAttenuation=0.f; _LinearAttenuation=0.f; } // *************************************************************************** } // NL3D