C++ (Cpp) glossyR Examples

Example #1

File: RoughPlasticBsdf.cpp Project: tunabrain/tungsten

Vec3f RoughPlasticBsdf::eval(const SurfaceScatterEvent &event) const
{
    bool sampleR = event.requestedLobe.test(BsdfLobes::GlossyReflectionLobe);
    bool sampleT = event.requestedLobe.test(BsdfLobes::DiffuseReflectionLobe);
    if (!sampleR && !sampleT)
        return Vec3f(0.0f);
    if (event.wi.z() <= 0.0f || event.wo.z() <= 0.0f)
        return Vec3f(0.0f);

    Vec3f glossyR(0.0f);
    if (sampleR)
        glossyR = RoughDielectricBsdf::evalBase(event, true, false, (*_roughness)[*event.info].x(), _ior, _distribution);

    Vec3f diffuseR(0.0f);
    if (sampleT) {
        float eta = 1.0f/_ior;
        float Fi = Fresnel::dielectricReflectance(eta, event.wi.z());
        float Fo = Fresnel::dielectricReflectance(eta, event.wo.z());

        Vec3f diffuseAlbedo = albedo(event.info);

        diffuseR = ((1.0f - Fi)*(1.0f - Fo)*eta*eta*event.wo.z()*INV_PI)*(diffuseAlbedo/(1.0f - diffuseAlbedo*_diffuseFresnel));
        if (_scaledSigmaA.max() > 0.0f)
            diffuseR *= std::exp(_scaledSigmaA*(-1.0f/event.wo.z() - 1.0f/event.wi.z()));
    }

    return glossyR + diffuseR;
}

Example #2

File: RoughCoatBsdf.cpp Project: ProjectAsura/tungsten

Vec3f RoughCoatBsdf::eval(const SurfaceScatterEvent &event) const
{
    bool sampleR = event.requestedLobe.test(BsdfLobes::GlossyReflectionLobe);
    bool sampleT = event.requestedLobe.test(_substrate->lobes());

    if (!sampleT && !sampleR)
        return Vec3f(0.0f);
    if (event.wi.z() <= 0.0f || event.wo.z() <= 0.0f)
        return Vec3f(0.0f);

    Vec3f glossyR(0.0f);
    if (sampleR)
        glossyR = RoughDielectricBsdf::evalBase(event, true, false, (*_roughness)[*event.info].x(), _ior, _distribution);


    Vec3f substrateR(0.0f);
    if (sampleT) {
        const Vec3f &wi = event.wi;
        const Vec3f &wo = event.wo;
        float eta = 1.0f/_ior;

        float cosThetaTi, cosThetaTo;
        float Fi = Fresnel::dielectricReflectance(eta, wi.z(), cosThetaTi);
        float Fo = Fresnel::dielectricReflectance(eta, wo.z(), cosThetaTo);

        if (Fi == 1.0f || Fo == 1.0f)
            return glossyR;

        Vec3f wiSubstrate(wi.x()*eta, wi.y()*eta, std::copysign(cosThetaTi, wi.z()));
        Vec3f woSubstrate(wo.x()*eta, wo.y()*eta, std::copysign(cosThetaTo, wo.z()));

        float compressionProjection = eta*eta*wo.z()/cosThetaTo;

        Vec3f substrateF = _substrate->eval(event.makeWarpedQuery(wiSubstrate, woSubstrate));

        if (_scaledSigmaA.max() > 0.0f)
            substrateF *= std::exp(_scaledSigmaA*(-1.0f/cosThetaTo - 1.0f/cosThetaTi));

        substrateR = compressionProjection*(1.0f - Fi)*(1.0f - Fo)*substrateF;
    }

    return glossyR + substrateR;
}