[Bf-blender-cvs] [31c1773e891] soc-2022-many-lights-sampling: Tweak intensity heuristic to use max instead of average, suggested by Alaska

[Brecht Van Lommel]

Commit: 31c1773e891e48223655bb53604e071423743fb7
Author: Brecht Van Lommel
Date:   Sat Nov 19 18:44:13 2022 +0100
Branches: soc-2022-many-lights-sampling
https://developer.blender.org/rB31c1773e891e48223655bb53604e071423743fb7

Tweak intensity heuristic to use max instead of average, suggested by Alaska

Ref D16554

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

M	intern/cycles/scene/shader.cpp

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

diff --git a/intern/cycles/scene/shader.cpp b/intern/cycles/scene/shader.cpp
index 463fc85d195..226e20d8753 100644
--- a/intern/cycles/scene/shader.cpp
+++ b/intern/cycles/scene/shader.cpp
@@ -350,8 +350,8 @@ void Shader::estimate_emission()
      * using a lot of memory in the light tree and potentially wasting samples
      * where indirect light samples are sufficient.
      * Possible optimization: estimate front and back emission separately. */
-    emission_sampling = (average(emission_estimate) > 0.5f) ? EMISSION_SAMPLING_FRONT_BACK :
-                                                              EMISSION_SAMPLING_NONE;
+    emission_sampling = (reduce_max(emission_estimate) > 0.5f) ? EMISSION_SAMPLING_FRONT_BACK :
+                                                                 EMISSION_SAMPLING_NONE;
   }
   else {
     emission_sampling = emission_sampling_method;