I'm familiar with the limit of 2 surface shaders max that you can mix in Materialx, at least with Karma. And I think when people are talking about doing that, they're talking about doing the mixing within a single MaterialX Builder subnet. I wanted to create a single "degradation" material that I could actually mix with several other materials like you can see in the attached screenshot, but it immediately crashes the materialx shader.

Is this possible in any way? The reason I can see for it crashing would actually be a fantastic strength if it worked: It would at least suggest that you could swap the degradation material via referencing in USD. Love the idea of being able to keep it as a stand-in, then maybe replacing via referencing with a shader that has snow or moss or rust in it down the line.

Any help is appreciated!