Function bsdf_diffuse_sample

src/kernel/closure/bsdf_diffuse.h:43–65

}

ccl_device int bsdf_diffuse_sample(const ccl_private ShaderClosure *sc,
                                   const float3 Ng,
                                   const float3 /*wi*/,
                                   const float2 rand,
                                   ccl_private Spectrum *eval,
                                   ccl_private float3 *wo,
                                   ccl_private float *pdf)
{
  const ccl_private DiffuseBsdf *bsdf = (const ccl_private DiffuseBsdf *)sc;
  const float3 N = bsdf->N;

  // distribution over the hemisphere
  sample_cos_hemisphere(N, rand, wo, pdf);

  if (dot(Ng, *wo) > 0.0f) {
    *eval = make_spectrum(*pdf);
  }
  else {
    *pdf = 0.0f;
    *eval = zero_spectrum();
  }
  return LABEL_REFLECT | LABEL_DIFFUSE;
}

/* TRANSLUCENT */