The uMaterialX node simply loads a MaterialX (.mtlx) definition file and creates a USD scene file creating only those materials.
uMaterialX Node Input
There are no inputs to the uMaterialX node. Only a file requester to load the .mtlx file.
uMaterialX Node Setup
Connect the material output to the rest of the USD tools.
uMaterialX Node Tab
The single control is a a Material File selector with a browse button to load the .mtlx file from
your computer.
uMaterialX Node Settings Tab
The Settings tab in the Inspector is also duplicated in other USD nodes.
