Cycles: More flexible GI Approximation AO distance control

The goal: allow to easily use AO approximation in scenes which combines
both small and large scale objects.

The idea: use per-object AO distance which will allow to override world
settings. Instancer object will "propagate" its AO distance to all its
instances unless the instance defines own distance (this allows to
modify AO distance in the shot files, without requiring to modify props
used in the shots.

Available from the new Fats GI Approximation panel in object properties.

Differential Revision: https://developer.blender.org/D12112

1 files changed, 4 insertions, 1 deletions

diff --git a/intern/cycles/kernel/kernel_types.h b/intern/cycles/kernel/kernel_types.h
index f9ea3a2d0a8..7cbe18acf28 100644
--- a/intern/cycles/kernel/kernel_types.h
+++ b/intern/cycles/kernel/kernel_types.h
@@ -1447,7 +1447,10 @@ typedef struct KernelObject {
 
   float shadow_terminator_shading_offset;
   float shadow_terminator_geometry_offset;
-  float pad1, pad2, pad3;
+
+  float ao_distance;
+
+  float pad1, pad2;
 } KernelObject;
 static_assert_align(KernelObject, 16);