diff options
Diffstat (limited to 'intern/cycles/kernel/svm/svm_tex_coord.h')
| -rw-r--r-- | intern/cycles/kernel/svm/svm_tex_coord.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/intern/cycles/kernel/svm/svm_tex_coord.h b/intern/cycles/kernel/svm/svm_tex_coord.h index 01dede3fff5..6ea2539c543 100644 --- a/intern/cycles/kernel/svm/svm_tex_coord.h +++ b/intern/cycles/kernel/svm/svm_tex_coord.h @@ -277,6 +277,7 @@ ccl_device void svm_node_normal_map(KernelGlobals *kg, ShaderData *sd, float *st float3 color = stack_load_float3(stack, color_offset); color = 2.0f*make_float3(color.x - 0.5f, color.y - 0.5f, color.z - 0.5f); + bool is_backfacing = (ccl_fetch(sd, flag) & SD_BACKFACING) != 0; float3 N; if(space == NODE_NORMAL_MAP_TANGENT) { @@ -306,6 +307,12 @@ ccl_device void svm_node_normal_map(KernelGlobals *kg, ShaderData *sd, float *st } else { normal = ccl_fetch(sd, Ng); + + /* the normal is already inverted, which is too soon for the math here */ + if(is_backfacing) { + normal = -normal; + } + object_inverse_normal_transform(kg, sd, &normal); } @@ -332,6 +339,11 @@ ccl_device void svm_node_normal_map(KernelGlobals *kg, ShaderData *sd, float *st N = safe_normalize(N); } + /* invert normal for backfacing polygons */ + if(is_backfacing) { + N = -N; + } + float strength = stack_load_float(stack, strength_offset); if(strength != 1.0f) { |