[Bf-blender-cvs] [a4eab80c224] soc-2022-many-lights-sampling: Fix back face being sampling despite disabled via EmissionSampling

[Weizhen Huang]

Commit: a4eab80c224ba3c4a12b66e148c764c389df1b9d
Author: Weizhen Huang
Date:   Wed Nov 23 17:01:07 2022 +0100
Branches: soc-2022-many-lights-sampling
https://developer.blender.org/rBa4eab80c224ba3c4a12b66e148c764c389df1b9d

Fix back face being sampling despite disabled via EmissionSampling

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

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

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

diff --git a/intern/cycles/kernel/light/tree.h b/intern/cycles/kernel/light/tree.h
index e1498486f84..dc7c1b3219a 100644
--- a/intern/cycles/kernel/light/tree.h
+++ b/intern/cycles/kernel/light/tree.h
@@ -267,6 +267,10 @@ ccl_device void light_tree_emitter_importance(KernelGlobals kg,
     }
     theta_o = 0.0f;
 
+    if (dot(bcone_axis, point_to_centroid) > 0) {
+      return;
+    }
+
     for (int i = 0; i < 3; i++) {
       const float3 corner = vertices[i];
       float distance_point_to_corner;