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Render baking panel disappears when GPU rendering and OptiX are enabled.
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System Information
Operating system: SUSE Leap 15.1
Graphics card: NVidia RTX 2070 Super (official drivers)

Blender Version
Broken: 2.83 beta, ff7a30d92884, x86_64 linux, 2020-05-18 (buildbot)
Worked: 2.80 (broken since 2.81 when OptiX support added)

Short description of error
Cycles render baking panel is not visible with GPU rendering if OptiX is enabled in the user prefs. Issue first appeared in 2.81 when OptiX support was added.

Exact steps for others to reproduce the error

  • switch to Cycles
  • set GPU render mode
  • user prefs->system->enable OptiX
  • bake panel disappears.

Event Timeline

Paul R (intracube) added a comment.EditedMay 20 2020, 3:11 AM

Hasn't Cycles baking always been CPU bound? That still seems to be the case.

Without OptiX set but with GPU enabled, the panel -is- visible even though it isn't making use of the GPU (from looking at the process table). So this is inconsistent.

Baking does use the GPU.


I monitored the CPU table and saw it pegged at 100% so thought the baking was running single-threaded. GPU fans didn't speed up so I assumed no activity there.

For discoverability, having the bake panel stay visible but greyed out with a message would be helpful. I spent some time searching through sub panels thinking bake had been moved as part of reorganisation. It took longer to realise it was OptiX dependant.

I know this isn't the place for UI discussion, so I'll leave this here and take it to devtalk: