USD: Support UDIMs inside USDz archives #118925

New Issue

Jesse Yurkovich · 2024-02-29T20:18:51+01:00

Jesse Yurkovich commented

2024-02-29 20:18:51 +01:00

Support for UDIMs inside USDz archives was added in the USD 23.05 release, available with our 3.6 LTS series and onwards.

This issue is a placeholder for work to go and address this on both the Import and Export side of things.

The relevant USD PR also added a few supporting methods on UsdUtils that might be useful:
https://github.com/PixarAnimationStudios/OpenUSD/pull/2133

Current Problems

Export:
The UDIM image files make it into the USDz archive, and are even viewable in usdview, but they are under the wrong path and the following warnings are produced on the console:

Warning: in _EnqueueDependency at line 113 of ...\pxr\usd\usdUtils\assetLocalization.cpp -- Failed to resolve reference @./textures/tiled-1.<UDIM>.png@ with computed asset path @t:/temp/blender_a07496/USDZ/textures/tiled-1.<UDIM>.png@ found in layer @t:\temp\blender_a07496\USDZ\usd-test-usdz_udim.usdc@.

The files are stored inside a 0/ directory instead of our textures/ directory.

Import:
During Import we resolve the UDIM asset_path but we skip the USDz extraction path entirely. Subsequent attempts to load will then fail:

WARN (io.usd): ...\blender\source\blender\io\usd\intern\usd_reader_material.cc:1191 load_tex_image: Couldn't open image file '0/tiled-1.<UDIM>.png' for Texture Image node

Support for UDIMs inside USDz archives was added in the USD 23.05 release, available with our 3.6 LTS series and onwards. This issue is a placeholder for work to go and address this on both the Import and Export side of things. The relevant USD PR also added a few supporting methods on `UsdUtils` that might be useful: https://github.com/PixarAnimationStudios/OpenUSD/pull/2133 #### Current Problems Export: The UDIM image files make it into the USDz archive, and are even viewable in `usdview`, but they are under the wrong path and the following warnings are produced on the console: ``` Warning: in _EnqueueDependency at line 113 of ...\pxr\usd\usdUtils\assetLocalization.cpp -- Failed to resolve reference @./textures/tiled-1.<UDIM>.png@ with computed asset path @t:/temp/blender_a07496/USDZ/textures/tiled-1.<UDIM>.png@ found in layer @t:\temp\blender_a07496\USDZ\usd-test-usdz_udim.usdc@. ``` The files are stored inside a `0/` directory instead of our `textures/` directory. Import: During Import we resolve the UDIM asset_path but we skip the USDz extraction path entirely. Subsequent attempts to load will then fail: ``` WARN (io.usd): ...\blender\source\blender\io\usd\intern\usd_reader_material.cc:1191 load_tex_image: Couldn't open image file '0/tiled-1.<UDIM>.png' for Texture Image node ```

Jesse Yurkovich added the

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USD: Support UDIMs inside USDz archives #118925

Current Problems