diff options
Diffstat (limited to 'intern/cycles/kernel/closure/bsdf_microfacet_multi.h')
-rw-r--r-- | intern/cycles/kernel/closure/bsdf_microfacet_multi.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/intern/cycles/kernel/closure/bsdf_microfacet_multi.h b/intern/cycles/kernel/closure/bsdf_microfacet_multi.h index cea59adfebe..aa4b91eac40 100644 --- a/intern/cycles/kernel/closure/bsdf_microfacet_multi.h +++ b/intern/cycles/kernel/closure/bsdf_microfacet_multi.h @@ -43,7 +43,7 @@ ccl_device_forceinline float D_ggx_aniso(const float3 wm, const float2 alpha) ccl_device_forceinline float2 mf_sampleP22_11(const float cosI, const float2 randU) { if(cosI > 0.9999f || cosI < 1e-6f) { - const float r = sqrtf(randU.x / (1.0f - randU.x)); + const float r = sqrtf(randU.x / max(1.0f - randU.x, 1e-7f)); const float phi = M_2PI_F * randU.y; return make_float2(r*cosf(phi), r*sinf(phi)); } @@ -83,7 +83,7 @@ ccl_device_forceinline float3 mf_sample_vndf(const float3 wi, const float2 alpha const float3 wi_11 = normalize(make_float3(alpha.x*wi.x, alpha.y*wi.y, wi.z)); const float2 slope_11 = mf_sampleP22_11(wi_11.z, randU); - const float2 cossin_phi = normalize(make_float2(wi_11.x, wi_11.y)); + const float2 cossin_phi = safe_normalize(make_float2(wi_11.x, wi_11.y)); const float slope_x = alpha.x*(cossin_phi.x * slope_11.x - cossin_phi.y * slope_11.y); const float slope_y = alpha.y*(cossin_phi.y * slope_11.x + cossin_phi.x * slope_11.y); |