45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
/*
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* ShadowVolume.cpp
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*
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* Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ShadowVolume.h"
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#include "MathUtil.h"
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#include "gl.h"
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namespace Zoom {
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ShadowVolume::ShadowVolume(const Triangle &t, const vmml::vec3f &lightPos) : visible(true) {
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MathUtil::Plane trianglePlane(t);
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for(int i = 0; i < 3; ++i) {
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rays[i].p = t.getVertex(i);
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}
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if(!trianglePlane.isBehind(lightPos)) {
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visible = false;
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return;
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}
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for(int i = 0; i < 3; ++i) {
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rays[i].dir = rays[i].p - lightPos;
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}
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}
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}
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