Inverse transform op does not always inverse the transform

[chloe5608]

Description of Issue

When loading a usda file in maya with the transform stack with the only inverted transformOp, loader will treat inverted transform as non-inverted transform.
e.g.
loading usda file with uniform token[] xformOpOrder = ["!invert!xformOp:translate"]

Steps to Reproduce

1. Load the attached file (cube_test.usda )into Maya:
   cube_test.zip

2. Cube shows up at location (0,0,-3.849). If translation is indeed inverted, cube should show up at (0,0,3.849)

System Information (OS, Hardware)

MacOS, MacPro

Package Versions

Maya USD importer

Build Flags

[chloe5608]

If I change the transform order into: uniform token[] xformOpOrder = ["translate","!invert!xformOp:translate"], the cube shows up at origin as expected.

[jtran56]

Filed as internal issue #145044.

[spiffmon]

Hi Chloe,
Indeed, there's a bug here in the Maya importer. usdview shows the expected result that for cuby_test.usda, the cube is positioned at (0, 0, 3.849), i.e. the authored translation is inverted and applied. It's a somewhat odd construct, as the "!invert!" operator is primarily meant for applying robust pivots, used in conjunction with the non-inverted corresponding op, as you have in your first comment.

Cheers,
--spiff

[mattyjams]

Hi @chloe5608,

We have a fix for this issue that should be available in the dev branch soon. Thanks for reporting it, and for the test case!

-Matt