warp.h

/*
    This file is part of Nori, a simple educational ray tracer
 
    Copyright (c) 2015 by Wenzel Jakob
 
    Nori is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License Version 3
    as published by the Free Software Foundation.
 
    Nori 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
 
#if !defined(__NORI_WARP_H)
#define __NORI_WARP_H
 
#include <nori/common.h>
#include <nori/sampler.h>
 
NORI_NAMESPACE_BEGIN
 
class Warp {
public:
    static Vector3f sampleUniformHemisphere(Sampler *sampler, const Normal3f &northPole);
 
    static Point2f squareToUniformSquare(const Point2f &sample);
 
    static float squareToUniformSquarePdf(const Point2f &p);
 
    static Point2f squareToUniformDisk(const Point2f &sample);
 
    static float squareToUniformDiskPdf(const Point2f &p);
 
    static Vector3f squareToUniformSphere(const Point2f &sample);
 
    static float squareToUniformSpherePdf(const Vector3f &v);
 
    static Vector3f squareToUniformSphereCap(const Point2f &sample, float cosThetaMax);
 
    static float squareToUniformSphereCapPdf(const Vector3f &v, float cosThetaMax);
 
    static Vector3f squareToUniformHemisphere(const Point2f &sample);
 
    static float squareToUniformHemispherePdf(const Vector3f &v);
 
    static Vector3f squareToCosineHemisphere(const Point2f &sample);
 
    static float squareToCosineHemispherePdf(const Vector3f &v);
 
    static Vector3f squareToBeckmann(const Point2f &sample, float alpha);
 
    static float squareToBeckmannPdf(const Vector3f &m, float alpha);
 
 
    static Vector3f squareToUniformTriangle(const Point2f &sample);
 
};
 
NORI_NAMESPACE_END
 
#endif /* __NORI_WARP_H */