C++ (Cpp) UniformHemispherePdf示例

示例#1

文件： bsdftest.cpp 项目： NickYang/pbrt-v3

void Gen_UniformHemisphere(BSDF* bsdf, const Vector3f& wo, Vector3f* wi,
                           Float* pdf, Spectrum* f) {
    float u1 = rng.UniformFloat();
    float u2 = rng.UniformFloat();
    Vector3f wiL = UniformSampleHemisphere(Point2f(u1, u2));
    *wi = bsdf->LocalToWorld(wiL);
    *pdf = UniformHemispherePdf();

    *f = bsdf->f(wo, *wi);
}

示例#2

文件： bsdftest.cpp 项目： jwzhang/pbrt-v2

void Gen_UniformHemisphere(BSDF* bsdf,
    const Vector & wo, Vector* wi, float* pdf, Spectrum* f)
{
    float u1 = rng.RandomFloat();
    float u2 = rng.RandomFloat();
    Vector wiL = UniformSampleHemisphere(u1, u2);
    *wi = bsdf->LocalToWorld(wiL);
    *pdf = UniformHemispherePdf();

    *f = bsdf->f(wo, *wi);
}

示例#3

文件： reflection.cpp 项目： tdapper/pbrt-v3

Spectrum BxDF::rho(int nSamples, const Point2f *u1, const Point2f *u2) const {
    Spectrum r(0.f);
    for (int i = 0; i < nSamples; ++i) {
        // Estimate one term of $\rho_\roman{hh}$
        Vector3f wo, wi;
        wo = UniformSampleHemisphere(u1[i]);
        Float pdfo = UniformHemispherePdf(), pdfi = 0;
        Spectrum f = Sample_f(wo, &wi, u2[i], &pdfi);
        if (pdfi > 0)
            r += f * AbsCosTheta(wi) * AbsCosTheta(wo) / (pdfo * pdfi);
    }
    return r / (Pi * nSamples);
}