Cycles bake black #46550
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Reference: blender/blender#46550
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System Information
Linux-x86_64
Ubuntu 14.04.3 LTS
GeForce GTX 680, NVIDIA Driver 352.30
Blender Version
2.76,
48f7dd6
Short description of error
Running
bpy.ops.object.bake(type="COMBINED")
sometimes works and bakes the texture for the selected object. Sometimes, it does not work, and the texture remains black. The exact setup has been scripted, and the exact steps produce different results. I cannot seem to find a pattern that is causing it, though I have noticed a few things:I have performed a small sampling, here are my results for 20 trials of my performing the exact steps listed below:
Works: 14 Fails: 6. It seems very near half the time it fails.
Exact steps for others to reproduce the error
It will either be completely black (incorrect), or occasionally it will be gray (correct)
The previously black image will now be gray (correct)
bake_bug.py
Changed status to: 'Open'
Added subscriber: @amoffat
Added subscriber: @Sergey
Added subscriber: @dfelinto
@dfelinto. any ideas here?
This issue was referenced by
7faa9d1304
Changed status from 'Open' to: 'Resolved'
This issue was referenced by blender/cycles@4e74a21e11
Great news! I'm curious..I skimmed the diff, but I was unable to see the non-deterministic portion that was causing the bug. What was it?
Added subscriber: @brecht
For me the bug was deterministic in the latest code. The combined baking code changed a lot since this bug was reported (D1674: Cycles-Bake: Custom Baking pass), so I assume that has something to do with it, but I didn't try to figure out what exactly.