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Reset to auto mode Step Size in VDB not works
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Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: 2x GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.87 + GTX 970 (main)

Blender Version
Broken: version: 2.83 (sub 9), branch: rB728faf49b24a, commit date: 2020-03-16

Short description of error
Hi, I found a little bug. If you use auto mode step size in the last build (value 0.000) and after use a custom value and try to come back in auto mode (reset value or manually put 0.000), the result is you get a very fine value (0.00001 m) and so the rendertime increase drastically. Go from 56sec to 7min34sec. The only way to reset to auto mode, recreate a new VDB object.

Exact steps for others to reproduce the error

  • Create a vdb object
  • Load a vdb
  • Render in auto mode
  • Change value in "Step size", like 0.1m in vdb object
  • Render
  • Try to reset value or put 0.000 and have result like 0.00001 m

Note : Same problem in Clipping

Hope it'll help, great option the VDB loader ;)