Maya: Correct Alembic export defaults AY-5273

[tokejepsen]

Changelog Description

Missing writeUVs on the Alembic extraction.

Testing notes:

1. Remove any overrides on project_settings/maya/publish/ExtractAlembic
2. Publish pointcache or animation.
3. Validate published geometry has UVs.

[moonyuet]

I slightly look at the code and I compared with the schema_maya_publish.json and it doesn't have the WriteUVs flag (they have WriteUVSets flag instead). Are we gonna add or change the name of that specific flag in schema_maya_publish.json? I am asking this as WriteUVsdoesn't show up in my setting

[BigRoy]

I slightly look at the code and I compared with the schema_maya_publish.json and it doesn't have the WriteUVs flag (they have WriteUVSets flag instead). Are we gonna add or change the name of that specific flag in schema_maya_publish.json?

Note that I believe writeUVSets and writeUVs is a different flag on the alembic exporter. The first meaning "export multiple UV sets" - the other meaning 'write any UV set'. If only the latter is enabled then only the current UV set would be exported.

See both present here:

• https://github.com/alembic/alembic/blob/master/maya/AbcExport/AbcExport.cpp#L389
• https://github.com/alembic/alembic/blob/master/maya/AbcExport/AbcExport.cpp#L414

Not entirely sure, but I believe that is the case.

Correction

NEVERMIND - That's uvWrite it seems.

See:

• https://github.com/alembic/alembic/blob/3dcd0960e3b58ac426fa7b933f25b2f99847f8f2/maya/AbcExport/MayaUtility.cpp#L613-L616
• https://github.com/alembic/alembic/blob/3dcd0960e3b58ac426fa7b933f25b2f99847f8f2/maya/AbcExport/MayaUtility.cpp#L587

It seems the other flag is uvWrite on the Alembic side of things.

[moonyuet]

I slightly look at the code and I compared with the schema_maya_publish.json and it doesn't have the WriteUVs flag (they have WriteUVSets flag instead). Are we gonna add or change the name of that specific flag in schema_maya_publish.json? I am asking this as WriteUVsdoesn't show up in my setting

Note that I believe writeUVSets and writeUVs is a different flag on the alembic exporter. The first meaning "export multiple UV sets" - the other meaning 'write any UV set'. If only the latter is enabled then only the current UV set would be exported.

See both present here:

• https://github.com/alembic/alembic/blob/master/maya/AbcExport/AbcExport.cpp#L389
• https://github.com/alembic/alembic/blob/master/maya/AbcExport/AbcExport.cpp#L414

Not entirely sure, but I believe that is the case.

We need to add WriteUVs into the schema_maya_publish.json then, if both WriteUVs and WriteUVSets existed as job arguments.

[BigRoy]

We need to add WriteUVs into the schema_maya_publish.json then, if both WriteUVs and WriteUVSets existed as job arguments.

Thanks - I edited my previous comment seems I misremembered slightly. We need both uvWrite and writeUVSets. And indeed writeUVs seems to be invalid/typo.

So I suppose:

• writeUVs -> writeUVSets
• Also enable uvWrite.

[BigRoy]

Tested successfully in Maya

Would be good - that aside of the publish passing you also confirm in the test that the resulting publish contains UVs.

[moonyuet]

Tested successfully in Maya

Would be good - that aside of the publish passing you also confirm in the test that the resulting publish contains UVs.

yes it has the UVs.

[ynbot]

Task linked: AY-5273 OP: Alembic UVs write issue