Hello! Importing Usd with MaterilX using UsdStageActor in editor is working well. However when I do the same in runtime (play in editor) I got scene with black materials.
It will not work in a packaged application as we are not able to build shader at runtime.
In PIE it is slightly different, did you set the render context to “mtlx” on your stage actor? I did a quick test and UE is hanging for me on 5.3
Yes, I did. Will try to find a different way to implement the feature I need 
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