diff options
Diffstat (limited to 'intern/cycles/kernel/closure/bsdf_phong_ramp.h')
| -rw-r--r-- | intern/cycles/kernel/closure/bsdf_phong_ramp.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/intern/cycles/kernel/closure/bsdf_phong_ramp.h b/intern/cycles/kernel/closure/bsdf_phong_ramp.h index 4236e77ae6c..a50df0b397d 100644 --- a/intern/cycles/kernel/closure/bsdf_phong_ramp.h +++ b/intern/cycles/kernel/closure/bsdf_phong_ramp.h @@ -79,6 +79,11 @@ ccl_device float3 bsdf_phong_ramp_eval_transmit(ccl_private const ShaderClosure return make_float3(0.0f, 0.0f, 0.0f); } +ccl_device_inline float phong_ramp_exponent_to_roughness(float exponent) +{ + return sqrt(1.0f / ((exponent + 2.0f) / 2.0f)); +} + ccl_device int bsdf_phong_ramp_sample(ccl_private const ShaderClosure *sc, float3 Ng, float3 I, @@ -86,11 +91,14 @@ ccl_device int bsdf_phong_ramp_sample(ccl_private const ShaderClosure *sc, float randv, ccl_private Spectrum *eval, ccl_private float3 *omega_in, - ccl_private float *pdf) + ccl_private float *pdf, + ccl_private float2 *sampled_roughness) { ccl_private const PhongRampBsdf *bsdf = (ccl_private const PhongRampBsdf *)sc; float cosNO = dot(bsdf->N, I); float m_exponent = bsdf->exponent; + const float m_roughness = phong_ramp_exponent_to_roughness(m_exponent); + *sampled_roughness = make_float2(m_roughness, m_roughness); if (cosNO > 0) { // reflect the view vector |