Exporting a StandardSurface with a bump map to MaterialX does not work.

[sharktacos]

Describe the bug Exporting a StandardSurface with a bump map to MaterialX does not work.

Steps to reproduce Steps to reproduce the behavior:

1. Connect File Texture > Bump2d > StandardSurface
2. USD Export with MaterialX option
3. Look at USD in LookdevX, no bump connection in the compound

Expected behavior This needs to convert a color4 to a vector3. This can be done with a ND_swizzle. Hoping this can be an easy fix.

Specs (if applicable):

• OS Windows 10
• Maya 2024a
• MayaUSD 0.25