[MAYA-128010] Default subdivisionScheme CatClark not written to file
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Description
### Discussed in https://github.com/Autodesk/maya-usd/discussions/2205
Originally posted by **yolov** March 21, 2022
Hi folks,
I decided to start a discussion to get a bit deeper into this before we (or someone) turns it into an issue.
When exporting from MayaUSD, the default subdivision scheme, which is Catmull-Clark is not written to the file at all. Only when the scheme is !default is it written to the file.
For example , the default doesn't leave anything in the file, while 'none' looks like this:
`uniform token subdivisionScheme = "none"`
I guess it must be according to the standard, but this poses a few issues for us because it seems the rendering behavior is different between Maya and Houdini.
If I create a simple plane in Maya (just a plane, not subdivided, no nothing) - it will render as a plane.
If I export it to USD and bring it back in Maya - still renders as a plane.
If I bring it to Houdini with USD - it will render as a disc (because no token means cat-clark for Houdini as well).
And yes, there's the option in Houdini to manually override it to 'none', but I think it would be ideal to get the expected behavior with the least amount of clicks.
Alex
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Research direction
Start with the linked discussion #2205 and reproduce the MayaUSD export using the simple plane described in the issue. Inspect the resulting USD for subdivisionScheme and compare the Maya and Houdini render behavior; done means the default Catmull-Clark behavior is represented as intended without a manual Houdini override.
Written by the indexing model from the issue text.
Assessment
- Domain
- computer-graphics
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100