Function Velvety__eval

tutorials/pathtracer/pathtracer_device.cpp:219–227

};

inline Vec3fa Velvety__eval(const Velvety* This,
                    const Vec3fa &wo, const DifferentialGeometry &dg, const Vec3fa &wi)
{
  const float cosThetaO = clamp(dot(wo,dg.Ns));
  const float cosThetaI = clamp(dot(wi,dg.Ns));
  const float sinThetaO = sqrt(1.0f - cosThetaO * cosThetaO);
  const float horizonScatter = powf(sinThetaO, This->f);
  return (horizonScatter * cosThetaI * float(one_over_pi)) * This->R;
}

inline Vec3fa Velvety__sample(const Velvety* This,
                      const Vec3fa &wo,