[Bf-blender-cvs] [4c8740a4521] blender-v3.0-release: Fix T93418: Cycles shadow terminator Geometry Offset artifacts with translucency

[Mikhail Matrosov]

Commit: 4c8740a45217fc9cc5c4f668695cdf6e7d446ec1
Author: Mikhail Matrosov
Date:   Tue Dec 7 18:48:41 2021 +0100
Branches: blender-v3.0-release
https://developer.blender.org/rB4c8740a45217fc9cc5c4f668695cdf6e7d446ec1

Fix T93418: Cycles shadow terminator Geometry Offset artifacts with translucency

Differential Revision: https://developer.blender.org/D13468

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M	intern/cycles/kernel/light/sample.h

===================================================================

diff --git a/intern/cycles/kernel/light/sample.h b/intern/cycles/kernel/light/sample.h
index 6b643a95250..5b2685e754e 100644
--- a/intern/cycles/kernel/light/sample.h
+++ b/intern/cycles/kernel/light/sample.h
@@ -199,6 +199,9 @@ ccl_device_inline float3 shadow_ray_offset(KernelGlobals kg,
     if (offset_cutoff > 0.0f) {
       float NgL = dot(Ng, L);
       float offset_amount = 0.0f;
+      if (NL < 0) {
+        NL = -NL;
+      }
       if (NL < offset_cutoff) {
         offset_amount = clamp(2.0f - (NgL + NL) / offset_cutoff, 0.0f, 1.0f);
       }