Update to OpenUSD's crate/usdc versioning support

General Announcements
1

Hi all,
In working with the AOUSD’s core Spec group and TAC, and Pixar’s desire to retire some (quite old now) technical debt, we’d like to adopt the following policy - please holler if you have concerns!

  1. Moving forward, crate version 0.8.0 (the introduction of list-editable payloads) will be the minimum supported version, for both OpenUSD and the forthcoming USD spec.
  2. Version 0.8.0 will be (as of the next release) the default version authored to crate files, bumped up automatically per-file whenever newer features are used.
  3. OpenUSD will retain support for 0.8.0 onward, for archival purposes, for the foreseeable future.
  4. At some point soon, we will remove support for earlier than 0.8.0 versions from OpenUSD. 0.8.0 was released in 2018.

You will retain the ability to specify a different (higher) default version by setting the USD_WRITE_NEW_USDC_FILES_AS_VERSION env var.

Thank you!

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2

Related to point 2, wasn’t the default crate version already bumped to 9.0[1] and then to 10.0[2] recently?
[1] Update default USD Crate format to 0.9.0 by dgovil · Pull Request #2838 · PixarAnimationStudios/OpenUSD · GitHub
[2] Blaming OpenUSD/pxr/usd/usd/crateFile.cpp at release · PixarAnimationStudios/OpenUSD · GitHub

FWIW, that 10.0 bump is very aggressive and we’ve patched that locally back to 9 as the env. var. escape hatch is too onerous for users.

But pre-8 versions can easily go away.

3

Correct on both counts, @deadpin … what we’re saying is, we acknowledge those bumps were more aggressive than they needed to be, and we’re going back to 0.8.0 to align with the language that will be in the AOUSD USD specification.

Cheers!

4

Version 0.8.0 will be (as of the next release) the default version authored to crate files, bumped up automatically per-file whenever newer features are used.

Thanks @spiff – so we’ll see OpenUSD/pxr/usd/usd/crateFile.cpp at dev · PixarAnimationStudios/OpenUSD · GitHub set back to 0.8.0 in OpenUSD v25.05 ? :folded_hands:t3:

5

That’s right, @asluk - the change went in today.

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