Constraint maya transform to usdPrim

[kreppene]

Hi, in this video it is mention that it is possible to constraint a maya object to a usdPrim, using a python script
https://youtu.be/z-w0BktAA-0?t=1497

Would it be possible to get a simply example on how this can be done?

Thanks :)

[santosd]

Hello @kreppene,

We have a regression test that covers some of these things, which may give some insight as to how it could be done:
https://github.com/Autodesk/maya-usd/blob/dev/test/lib/testMayaUsdProxyAccessor.py#L107

Some extras:
Way to expose a translate operation to allow connection through the node editor:

import mayaUsd.lib.proxyAccessor as pa

selUfeObject = pa.getUfeSelection()
pa.createXformOps(selUfeObject)
pa.getOrCreateAccessPlug(ufeObject=selUfeObject,usdAttrName='xformOp:translate')

Parenting a Maya object to a USD Prim (select DAG child object\s first and then select the USD prim):

import mayaUsd.lib.proxyAccessor as pa

pa.parent()

Make note that we haven't fleshed out any workflows at this time, we have simply exposed some things that allow for possible ways to connect between MayaUSD and Maya DAG objects.

I hope that helps.

-David Santos

[kreppene]

Thank you @santosd, it works perfectly:)

[neilrubie]

I'm also experimenting with parenting Maya objects to usdPrims. While the parent() function exposed in proxyAccessor.py does seem to achieve the desired effect in terms of final transformations, the maya dag node itself stays where it is in the outliner, not visibly parented underneath the prim. I'm just wondering if is this expected behaviour at this point? or am I missing something? Thanks!

[kxl-adsk]

Yes, this is expected. With UFE v3 we have added a way to replace a subset of the hierarchy with a Maya's one...but it's not hooked to the parenting example you are using.

[neilrubie]

Yes, this is expected. With UFE v3 we have added a way to replace a subset of the hierarchy with a Maya's one...but it's not hooked to the parenting example you are using.

Now that UFE v3 has been released through maya2023, would you be able to point me to where I can find this hierarchy replacement functionality and how to use it? Specifically I'm looking to "parent" a maya hierarchy underneath a prim, similar to how it's being done with the mayaUsd's MayaReference node.

[kxl-adsk]

Hi @neilrubie. I no longer work at Autodesk, so please wait for confirmation from the team.

What I was referring to was PathMapping service we added to support UpdaterManager. EditAsMaya workflow is utilizing this codepath.

Cheers,
KxL