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Messed up UVs when subdividing left-handed winding order geometry #1075

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ababak opened this issue Jan 3, 2020 · 1 comment
Closed

Messed up UVs when subdividing left-handed winding order geometry #1075

ababak opened this issue Jan 3, 2020 · 1 comment

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@ababak
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ababak commented Jan 3, 2020

Description of Issue

There is a problem with OpenSubdiv UV handling for left-handed winding order geometry (the default ).
See the discussion from "usd-interest" group

Steps to Reproduce

Download and extract the attached files: cube.zip

  1. Open cube_abc.usda in "usdview"
  2. Select "View > Complexity > Medium"
  3. Switch to "View > Hydra Renderer > GL"
  4. Note the messed up UVs ❌
  5. Switch to "View > Hydra Renderer > Prman"
  6. Note the UVs are ok 🍀
  1. Open cube_abc_fixed.usda in "usdview"
  2. Select "View > Complexity > Medium"
  3. Switch to "View > Hydra Renderer > GL"
  4. Note the UVs are ok 🍀 (there's a "fix" that forces orientation = "rightHanded" which fixes the GL but breaks the Prman)

Notes

The alembic file was exported from Maya using the default settings.
@jilliene
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jilliene commented Jan 6, 2020

Filed as internal issue #USD-5773

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3 participants
@ababak @sunyab @jilliene