Preview purpose bound materials don't get converted to maya shaders on import

[tom-wi-souza]

Hi,

When importing a usd file which contains materials that are bound with the binding:preview the USD materials don't get converted back in to maya shaders.

Default binding without selected Purpose.

rel material:binding = </pig/materials/red_material>

Binding with purpose preview

rel material:binding:preview = </pig/materials/red_material>

Steps to reproduce

1. import USD file which contains binding:preview
2. make sure check materials in USD import options
3. Notice materials are missing / not present in the scene.

Alternative method:

1. create usd stage
2. create xform
3. reference USD file which contains binding:preview
4. Right click on xform and Duplicate as Maya Data
5. Notice materials are missing / not present in the scene.

Expected behavior
Materials are converted into maya shaders when binding has purpose preview.

Attachments

usd_preview_assignements.zip

Specs (if applicable):

• OS & version: e.g. Windows 11
• Maya version: Maya 2025
• Maya USD: 0.30.0

Thanks for the help and having a look.

Best,

• Tom