Commit: 9e5c1787a51cdccbb8b0443fde1b1247c77c639b
Author: Weizhen Huang
Date: Mon Jan 16 16:20:00 2023 +0100
Branches: microfacet_hair
https://developer.blender.org/rB9e5c1787a51cdccbb8b0443fde1b1247c77c639b
Remove empirical scaling to match microfacet and principled hair BSDF
===================================================================
M intern/cycles/kernel/svm/closure.h
===================================================================
diff --git a/intern/cycles/kernel/svm/closure.h
b/intern/cycles/kernel/svm/closure.h
index f4953e8beee..42abbbdd3a3 100644
--- a/intern/cycles/kernel/svm/closure.h
+++ b/intern/cycles/kernel/svm/closure.h
@@ -940,14 +940,6 @@ ccl_device_noinline int
svm_node_closure_bsdf(KernelGlobals kg,
bsdf->distribution_type = clamp(
distribution_type, NODE_MICROFACET_HAIR_GGX,
NODE_MICROFACET_HAIR_BECKMANN);
- /* Empirical equivalences compared with principled hair BSDF. */
- if (bsdf->distribution_type == NODE_MICROFACET_HAIR_GGX) {
- roughness *= 0.5f;
- }
- else { /* bsdf->distribution_type == NODE_MICROFACET_HAIR_BECKMANN*/
- roughness *= 2.f / 3.f;
- }
-
bsdf->N = N;
bsdf->roughness = roughness;
bsdf->tilt = tilt;
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