Steps to reproduce:
Use autogroups on the teeth of the attached model to separate them into distinct polygroups.
Toggle through the teeth, hiding and unhiding.
Each time I do this, faces from one polygroup to the others until they’re all jumbled up together.
Did some more testing. Don’t seem to be able to reproduce this with a single mesh ZTL. It’s multi-meshes that seem to cause the problem. Did a second test with four blocks created by shadowbox. Note how if you hide one or more, when they reappear you will have whole sides of the blocks shifted among the others’ polygroups. The teeth above were created with Zsketch.
yep confirmed, polygroups are falling apart, getting messed up after hiding/unhiding a few times.
This is driving me crazy as well. I have found (for the most part) that things are working OK as long as I do my showing and hiding on ANYTHING OTHER than my lowest subdivision level.
I will get some random quads that go to another polygroup and no matter what I do I can not get them to stick. The really bad part is this is also messing up the UV’s on my model for the quads. I had to take my lowest sub D level into Maya and fix everything back up. Now I have a base level model with SubD levels and correct UV’s saved out as an OBJ. If things mess up I just reimport this model back in to fix things. Not a cool work around but it is doing the trick.
Peace-NickZ. 