diff options
Diffstat (limited to 'intern/cycles/kernel/closure/bsdf_hair_principled.h')
| -rw-r--r-- | intern/cycles/kernel/closure/bsdf_hair_principled.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/intern/cycles/kernel/closure/bsdf_hair_principled.h b/intern/cycles/kernel/closure/bsdf_hair_principled.h index 18934d86cc8..389bd62ba68 100644 --- a/intern/cycles/kernel/closure/bsdf_hair_principled.h +++ b/intern/cycles/kernel/closure/bsdf_hair_principled.h @@ -213,7 +213,9 @@ ccl_device int bsdf_principled_hair_setup(ShaderData *sd, PrincipledHairBSDF *bs /* TODO: we convert this value to a cosine later and discard the sign, so * we could probably save some operations. */ - float h = dot(cross(sd->Ng, X), Z); + float h = (sd->type & (PRIMITIVE_CURVE_RIBBON | PRIMITIVE_MOTION_CURVE_RIBBON)) ? + -sd->v : + dot(cross(sd->Ng, X), Z); kernel_assert(fabsf(h) < 1.0f + 1e-4f); kernel_assert(isfinite3_safe(Y)); |