I use MaterialX in Solaris to have the universal project so that I can export it in USD afterwards.
Karma supports MaterialX but not Arnold (as a plugin in houdini).
Arnold just makes the USD preview and when I disable the auto generate preview, nothing more...
I can’t find any information on this subject on the internet. If joint this finds a capture with karma (which works) and the other with Arnold (does not work)
I am experiencing the same issue. A scene containing MaterialX standard surface shaders, renders fine with Karma but not Arnold, the strange part is that the same USD file renders fine with Arnold in Maya (MtoA).
Karma :
Arnold :
Scene files :
Image Not Found
Using Houdini : 19.5.403 HtoA 6.1.3.3 (Arnold 7.1.3.2)
UPDATE : In my case it is HtoA version, MaterialX wasn't supported with USD.
