Hey, thanks for your reply. Here you can download some example files with the same/similar setup:
I was experimenting a lot. The legacy FBX Import works but I switching USD to Interchange Import it was no longer working.
It felt as if the Material Section in the Interchange Pipeline Import is completely ignored and New Materials are created on every import. Yes it is experimental but maybe I just completely misunderstand the import process.
Expectation: Similar to the old process unreal checks Materials FIRST before creating a new MaterialInstance ad IF it creates a MaterialInstance it respects my Mastermaterial.
Materials that are already existing are never overwritten or altered.
Thanks,
Hartmut