Function OBJMaterial__eval

tutorials/pathtracer/pathtracer_device.cpp:554–571

}

Vec3fa OBJMaterial__eval(ISPCOBJMaterial* material, const BRDF& brdf, const Vec3fa& wo, const DifferentialGeometry& dg, const Vec3fa& wi)
{
  Vec3fa R = Vec3fa(0.0f);
  const float Md = max(max(brdf.Kd.x,brdf.Kd.y),brdf.Kd.z);
  const float Ms = max(max(brdf.Ks.x,brdf.Ks.y),brdf.Ks.z);
  const float Mt = max(max(brdf.Kt.x,brdf.Kt.y),brdf.Kt.z);
  if (Md > 0.0f) {
    R = R + (1.0f/float(M_PI)) * clamp(dot(wi,dg.Ns)) * brdf.Kd;
  }
  if (Ms > 0.0f) {
    const Sample3f refl = make_Sample3f(reflect(wo,dg.Ns),1.0f);
    if (dot(refl.v,wi) > 0.0f)
      R = R + (brdf.Ns+2) * float(one_over_two_pi) * powf(max(1e-10f,dot(refl.v,wi)),brdf.Ns) * clamp(dot(wi,dg.Ns)) * brdf.Ks;
  }
  if (Mt > 0.0f) {
  }
  return R;
}

Vec3fa OBJMaterial__sample(ISPCOBJMaterial* material, const BRDF& brdf, const Vec3fa& Lw, const Vec3fa& wo, const DifferentialGeometry& dg, Sample3f& wi_o, Medium& medium, const Vec2f& s)
{