GeomSubset created on "View selected"

[JakobJK]

Describe the bug
Using "Isolate Select" → "View Selected" on selected polygons of a mesh will create a GeomSubset on the mesh when exporting to usd.

Steps to reproduce
Steps to reproduce the behavior:

1. Create any polygon mesh.
2. Select a few polygons components of the mesh.
3. In any viewpanel go to the Panel Menu "Show" → "Isolate Select" → "Show Selected"
4. Export your geometry as USD. You should now see an additional GeomSubset in the usd file named after your camera you were using to isolate the selected components.

Expected behavior
I didn't expect any GeomSubsets to be created by Maya display behavior.

Attachments
Example USD output - Gist

Specs (if applicable):

• Rocky Linux, Maya 2024.1

[wallworm]

Thanks for reporting. I'm bringing it up with the team.

[santosd]

@wallworm would you like me to log this one internally?

[wallworm]

@santosd Yes.

[santosg87]

@JakobJK would you be able to provide us a little more information on what you would expect the export to look like - and also, if possible a bit more info on how you are exporting - are you exporting the full geometry? just the selected faces? are you using export Selection, or export all? we are trying to narrow down the behavior to better understand what is the culprit.

[JakobJK]

Hey @santosg87, absolutely!

I created a new USD here (Just so I could confirm exactly how I export). I exported it using "export selection" and I selected the "group1" node, which has the pCube1 as a child. I don't attempt to export selected faces, or even individual pieces of geometry. I only pick the root node of the model.

My export USD export settings are the default. (I only changed to ascii in this case of course). I could technically "fix" this by turning off component tagging during export, but there will be situations I can imagine where we'd want components tag, but not these particular GeomSubsets.

Let me know if I can provide with anything that could be helpful.

[BigRoy]

@JakobJK it's a bit unclear from your last message whether you wanted your "Isolate View" to actually influence the export or not?

I'd assume that you consider the Isolate View in the viewport to be for viewport only and not have any influence whatsoever on the export - and that's why you did not expect the GeomSubset to be exported?

This is somewhat confirmed by your original post of this issue.

Expected behavior
I didn't expect any GeomSubsets to be created by Maya display behavior.

And I agree - I wouldn't expect that to get exported along at all.

---

In this export that you linked I don't see any GeomSubset related to an isolate view. Is that correct? I only see a cube's default Component Tags.

[JakobJK]

Whoops! I totally skipped that question. Sorry.

Ideally, I don't want "isolate view" to influence the export at all. I, and a few modelers I've talked to, have found it surprising that it does have an affect. We didn't expect any GeomSubsets to be created. So exactly the same file, but without any GeomSubsets present would be ideal, when using the "isolate select" feature.

The GeomSubsets that are created from "view selected" are the GeomSubsets are the ones named bottom, top, right, left, etc.

[BigRoy]

Could you share an example usd file that has the isolate view geomsubset?

I don't see it in the example you provided:

Attachments
Example USD output - Gist

And I can't seem to reproduce it in Maya 2024.1 + MayaUSD 0.25.0.

Here's my test file:
example_isolate_view_test.zip

[JakobJK]

It's in the gist. As I mentioned they are the GeomSubsets named bottom, top, etc:
I have USD version 0.23.1, so it might have been fixed in 0.25.0?

      def GeomSubset "bottom"
      {
          uniform token elementType = "face"
          uniform token familyName = "componentTag"
          int[] indices = [20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39]
      }

      def GeomSubset "sides"
      {
          uniform token elementType = "face"
          uniform token familyName = "componentTag"
          int[] indices = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
      }

      def GeomSubset "top"
      {
          uniform token elementType = "face"
          uniform token familyName = "componentTag"
          int[] indices = [40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59]
      }

[BigRoy]

Those are not related to isolate view, but are the mesh's component tags. You should be seeing these exported even without isolate view. Can you confirm?

[JakobJK]

Oooh, my bad. I feel like I owe everyone a beer now. You're right. Sorry about this. I think I jumped to the conclusion a little tunnel visioned. Thanks for clearing that up for me!

[santosd]

Thanks for the response on this one @BigRoy. I will go ahead and close this one out @JakobJK. However, let me know if you still have concerns around this ticket and we can reopen.