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/*
* MathUtil.cpp
*
* Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "MathUtil.h"
#include <cmath>
namespace Zoom {
const float MathUtil::EPSILON = 1E-6;
vmml::vec3f MathUtil::Plane::intersection(const vmml::vec3f &p, const vmml::vec3f &dir) const {
float r = (d - p.dot(normal))/dir.dot(normal);
return p + r*dir;
}
vmml::mat4f MathUtil::perspective(float fovy, float aspect, float zNear) {
float f = 1/std::tan(fovy*M_PI/360);
vmml::mat4f ret(vmml::mat4f::ZERO);
ret[0][0] = f/aspect;
ret[1][1] = f;
ret[2][2] = EPSILON-1;
ret[2][3] = (EPSILON-2)*zNear;
ret[3][2] = -1;
return ret;
}
}
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