Description

When importing static mesh from USD file then it has the wrong amount of UV channels. Selecting a UV channel shows an empty area in the viewport.

 

Regression: YES - not reproduced in 4.25.3 production

Update:
In order for this to work the models st primvars must be changes from float2 to texCoord2f. After that UV channels should import properly

Steps to Reproduce

Precondition

  • Have a project with USD importer plugin enabled. Have the files sync from: //UE4/Main/Sandbox/QASourceAssets/Studio/USD/Import/

Repro

  1. Import into Level USD file with Basic options - [ [Link Removed] ]
    • [file] = //UE4/Main/Sandbox/QASourceAssets/Studio/USD/Import/Mesh/topo_wasp.usda
  2. Import into Level USD file
    • [file] = //UE4/Main/Sandbox/QASourceAssets/Studio/USD/Import/Mesh/update/topo_wasp.usda
    • Use same options
  3. Edit the asset SM_Wasp_wasp from the Content Browser
  4. In the top Toolbar of the Static Mesh editor, click on the UV dropdown
  5. Select UV channel 0

Actual result
UV is shown empty. There are only 1 UV channel.
[Link Removed]

Expected result
UV match expected result (see attachments). There are 3 UV channels.
[Link Removed]

Have Comments or More Details?

There's no existing public thread on this issue, so head over to AnswerHub just mention UE-100533 in the post.

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By Design
ComponentTools - Import
Affects Versions4.26
Target Fix4.26
CreatedOct 6, 2020
ResolvedOct 12, 2020
UpdatedOct 22, 2020