Properties lost or changed when exporting to USD #109134

New Issue

William-Archer · 2023-06-19T18:59:33+02:00

William-Archer commented

2023-06-19 18:59:33 +02:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA RTX A2000 12GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 528.95

Blender Version
Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: e1ccd9d4a1d3
Worked: (newest version of Blender that worked as expected)

Using Cycles as the render engine.

Short description of error
When exporting a test scene to USD format and then importing from the .usdc file, information about the scene is lost or changed unexpectedly. The power of a point light source is decreased by a factor of 100, i.e. a light with power 1000W or 2000W initially will have only 10W or 20W respectively after exporting to USD and then re-importing. Principled BSDF materials have their Transmission, Anisotropic and Anisotropic Rotation properties reset to 0, and their Emission color reset to black. Glass BSDF and Emission materials get reset to a default white diffuse material without nodes, or any options other than the Diffuse Color.

Exact steps for others to reproduce the error
Open the .blend file. E.g. File -> Open -> palette.blend
Export everything to a .usdc file. E.g. File -> Export -> Universal Scene Description (.usd*)
Open a new, empty workspace. E.g. File -> New -> General, Keyboard "A" [select all], Keyboard "Delete" [delete selection]
Import the .usdc file that was created. E.g. File -> Import -> Universal Scene Description (.usd*)

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA RTX A2000 12GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 528.95 **Blender Version** Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: `e1ccd9d4a1d3` Worked: (newest version of Blender that worked as expected) Using Cycles as the render engine. **Short description of error** When exporting a test scene to USD format and then importing from the .usdc file, information about the scene is lost or changed unexpectedly. The power of a point light source is decreased by a factor of 100, i.e. a light with power 1000W or 2000W initially will have only 10W or 20W respectively after exporting to USD and then re-importing. Principled BSDF materials have their Transmission, Anisotropic and Anisotropic Rotation properties reset to 0, and their Emission color reset to black. Glass BSDF and Emission materials get reset to a default white diffuse material without nodes, or any options other than the Diffuse Color. **Exact steps for others to reproduce the error** Open the .blend file. _E.g. File -> Open -> palette.blend_ Export everything to a .usdc file. _E.g. File -> Export -> Universal Scene Description (.usd*)_ Open a new, empty workspace. _E.g. File -> New -> General, Keyboard "A" [select all], Keyboard "Delete" [delete selection]_ Import the .usdc file that was created. _E.g. File -> Import -> Universal Scene Description (.usd*)_

palette.blend

1.9 MiB

palette original.png

1.8 MiB

palette after.png

1.7 MiB