Correlated Multi-jitter viewport rendering inconsistencies
Open, Needs TriagePublic

Description

System Information
CPU: Ryzen R5 2500U
GPU : Vega 8
RAM: 8GB
OS: Windows 10 64bit 1803

Notes: All tests were done on the CPU. There may be a difference with GPU, but I can't get the GPU to stably work.

Blender Version
Broken:
Blender 2.79b
Blender 2.79 Daily build (blender-2.79-76f640c27d8-win64) - Oct 10 2018
Blender 2.8 (blender-2.80-1dd3b93d2f9-win64) - Oct 10 2018

Short description of error
When these things are true, viewport render results appear different from expectations (Final render doesn't appear to have these issues):

  1. Branched Path Tracing is enabled
  2. Viewport AA samples are set to 0
  3. A materials samples is set to any even number greater than 1 (E.G. Diffuse = 2) (Note: Only the materials with their values greater than 1 and are even will have this effect. E.G, Diffuse at 2 and Glossy at 3 will give you expected results for glossy materials but not diffuse.)
  4. Rendering Pattern is set to Correlated Multi-Jitter

Here's a few pictures:



Here's a few Blend files to test with (I've used interior scenes as they show the effect quite well):
Blender 2.8:

Blender 2.79b and 2.79 Master:

Details

Type
Bug
Alaska (Alaska) renamed this task from Correlated Multi-jitter rendering inconstancy to Correlated Multi-jitter rendering inconsistency .
Alaska (Alaska) removed Brecht Van Lommel (brecht) as the assignee of this task.
Alaska (Alaska) renamed this task from Correlated Multi-jitter rendering inconsistency to Correlated Multi-jitter viewport rendering inconsistencies .Wed, Oct 10, 11:55 AM
Alaska (Alaska) updated the task description. (Show Details)