USD export does not respect opacity threshold for clip alpha blend mode #107062
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Michael B Johnson
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Reference: blender/blender#107062
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System Information
Operating system: macOS 13
Graphics card: M1 Max
Blender Version
Broken: 3.5.0
Worked: never
When setting the
Blend Modeof a material toAlpha Clip, an additionalClip Thresholdvalue can be specified, which allows one to create an alpha cut-out where the material is transparent wherever the input texture is less than the specified threshold. Then exporting a scene to USD, this clip threshold needs to be translated toUSD Preview Surface'sopacityThresholdattribute.Blender is properly respecting the
opacityThresholdon import, but not for export.Exact steps for others to reproduce the error
Open attached opacity_threshold_export_example.blend, with the attached alpha_cutout.png in the same directory.
Notice two white images in front of a blue background. The left image uses an alpha cutout, the right image uses alpha blending.
File->Export->USD
File->New
File->Import->USD
Select the exported USD file.
Notice that the left image appears incorrect.
Not sure about proper way to link things, but this issue is addressed by this PR:
#107149
PR is submitted already that addressees this issue so confirming.