meshTransform cannot execute twice

[bdeda]

https://github.com/AnimalLogic/AL_USDMaya/tree/master/tutorials/meshTranslation

When working through this tutorial process, I can import the sphere, pull some verts, and save those changes to the session layer. This initial process works fine. When I try to do this a second time, where I import the mesh, move different verts, then save those changes to the session layer, the second edit is lost. The code never hits the Mesh::writeEdits logic the second time around.

I tracked it down to TranslatorContext::unloadPrim, (line 532), there is a test to ensure preTearDown is only called once.
// call pretearDown if it hasn't been called before
if(!translator->isTearingDown()) {...call preTearDown...}

This "isTearingDown" test prevents the edits from being saved the second time the mesh is edited and saved back to the session layer. I changed this in a local build to remove the if statement, and then the mesh edits save each time I import, edit, and save to the session layer. I don't know if that is a valid fix for this though.
meshTranslationEdits.py.txt

[dbaz]

Hi Ben, That if was to make sure the isTearingDown didn't get called twice, but it might not be actually necessary, I'll take a look and confirm

-Baz

[dbaz]

A fix will be out for the next release. I removed the bool entirly. which means the preTearDown can get called more than once in some cases, such as a variant switch that removes a Mesh. But no ill-effects happen because of this from what I have seen.

[dbaz]

Next release will be mid next week