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It's possible convert a big selection of C4D Standard materials easily and automatically to Arnold Shader with: Utility -> Materials -> "Replace Arnold Shader selection with C4D Standard material" It would be great that this script become as part os C4toA in: (I don't find a script available on Internet to do it). Sure that with CINEMA 4D scripting an expert could do a custom script that solve this issue. Unless you have a Cinema 4D script to revert all Arnold Shaders to Standard C4D materials (due that this assignation are preserved in FBX). If you need export fbx and need sort objects by material assignation and you had work with Arnold Shaders you are in a problem. If you open FBX saved from a file with Arnold Shaders applied to objects, you can see that is like none material assignation was be applied. No, FBX seems not store any Arnold Shader assignation from C4D.
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