[Bf-blender-cvs] [fd2a155d068] blender-v3.0-release: Fix T91797: Cycles volume rendering artifact with overlapping volumes

[Brecht Van Lommel]

Commit: fd2a155d068fdd3e6a6c3b4d58772b1dc9921291
Author: Brecht Van Lommel
Date:   Thu Nov 18 19:25:15 2021 +0100
Branches: blender-v3.0-release
https://developer.blender.org/rBfd2a155d068fdd3e6a6c3b4d58772b1dc9921291

Fix T91797: Cycles volume rendering artifact with overlapping volumes

With the new volume rendering code this was no longer accurate, we always
need to use a new dimension for the next volume segment.

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

M	intern/cycles/kernel/integrator/path_state.h

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

diff --git a/intern/cycles/kernel/integrator/path_state.h b/intern/cycles/kernel/integrator/path_state.h
index de6c3ae8161..eac9ceeae70 100644
--- a/intern/cycles/kernel/integrator/path_state.h
+++ b/intern/cycles/kernel/integrator/path_state.h
@@ -208,9 +208,7 @@ ccl_device_inline bool path_state_volume_next(IntegratorState state)
   }
 
   /* Random number generator next bounce. */
-  if (volume_bounds_bounce > 1) {
-    INTEGRATOR_STATE_WRITE(state, path, rng_offset) += PRNG_BOUNCE_NUM;
-  }
+  INTEGRATOR_STATE_WRITE(state, path, rng_offset) += PRNG_BOUNCE_NUM;
 
   return true;
 }