bsdf.h

/*
    This file is part of Nori, a simple educational ray tracer
 
    Copyright (c) 2015 by Wenzel Jakob, Romain Prévost
 
    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_BSDF_H)
#define __NORI_BSDF_H
 
#include <nori/object.h>
 
NORI_NAMESPACE_BEGIN
 
struct BSDFQueryRecord {
    Vector3f wi;
 
    Vector3f wo;
 
    float eta;
 
    EMeasure measure;
 
    Point2f uv;
 
    BSDFQueryRecord(const Vector3f &wi, const Point2f &uv)
        : wi(wi), measure(EUnknownMeasure), uv(uv) { }
 
    BSDFQueryRecord(const Vector3f &wi,
            const Vector3f &wo, EMeasure measure, const Point2f& uv)
        : wi(wi), wo(wo), measure(measure), uv(uv) { }
 
};
 
class BSDF : public NoriObject {
public:
    virtual Color3f sample(BSDFQueryRecord &bRec, const Point2f &sample) const = 0;
 
    virtual Color3f eval(const BSDFQueryRecord &bRec) const = 0;
 
    virtual float pdf(const BSDFQueryRecord &bRec) const = 0;
 
    virtual EClassType getClassType() const override { return EBSDF; }
 
    virtual bool isDiffuse() const { return false; }
};
 
NORI_NAMESPACE_END
 
#endif /* __NORI_BSDF_H */