Export USD MaterialX to other softwares

[eirik2377]

Hi, I'm trying to export a USD Solaris scene that contain MaterialX shaders.
Problem is that when I try to load this USD scene in other applications like 3D's Max and UE5, the shader isnt setup properly, its missing normal map, displacement and other basic things.
The only thing that works is USD Preview Shader, but we want to use MaterialX.

[haggi]

At least in Maya an MatX usd file can be read correctly. So I suppose the export is correct. But you can have a look if you export the materials as usda file.

[eirik2377]

Can you tell if something is wrong here?
I only see Albedo and Roughness when I try to import it to Unreal Engine or 3D's Max.
The normal map does not show up

cliff_v8.usda

[haggi]

Looks fine to me, in Maya it looks like this. All nodes are there. However I don't have any experience with Max or Unreal, but the material defnition seems to be okay.

[fsimerey]

For Unreal Engine, the problem come from Epic Games.

MaterialX materials must be .mtlx file referenced in USD. See this topic https://forums.unrealengine.com/t/usd-encoded-materialx-updated-for-ue5-6/2378503

From Unreal documentation, https://dev.epicgames.com/documentation/en-us/unreal-engine/interchange-materialx-reference-in-unreal-engine

They recommend to use Substrate Materials which is working pretty well if you respect the version of MaterialX library used in UE5, version 1.38 (Houdini 21 use v1.39 with some new functions not present in v1.38)