diff options
Diffstat (limited to 'intern/cycles/kernel/kernel_light.h')
| -rw-r--r-- | intern/cycles/kernel/kernel_light.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/intern/cycles/kernel/kernel_light.h b/intern/cycles/kernel/kernel_light.h index efab69ee37d..ec7203d36eb 100644 --- a/intern/cycles/kernel/kernel_light.h +++ b/intern/cycles/kernel/kernel_light.h @@ -170,7 +170,7 @@ float3 background_map_sample(KernelGlobals *kg, float randu, float randv, float float2 cdf_last_v = kernel_tex_fetch(__light_background_marginal_cdf, res); /* importance-sampled V direction */ - float dv = (randv - cdf_v.y) / (cdf_next_v.y - cdf_v.y); + float dv = inverse_lerp(cdf_v.y, cdf_next_v.y, randv); float v = (index_v + dv) / res; /* this is basically std::lower_bound as used by pbrt */ @@ -196,7 +196,7 @@ float3 background_map_sample(KernelGlobals *kg, float randu, float randv, float float2 cdf_last_u = kernel_tex_fetch(__light_background_conditional_cdf, index_v * cdf_count + res); /* importance-sampled U direction */ - float du = (randu - cdf_u.y) / (cdf_next_u.y - cdf_u.y); + float du = inverse_lerp(cdf_u.y, cdf_next_u.y, randu); float u = (index_u + du) / res; /* compute pdf */ |