The xparticles shader was not touched and I don't see any problems here. Is the shader not available in the network editor at all? Maybe your installation is corrupted. Do you have any error/warning in the log (console)? Are you on Windows or Mac? Can you see the normal_displacement or vector_displacement shaders in the editor?
As a workaround, you can use a user_data_rgb shader instead of xparticles. Set the attribute to xp_color.
Hi Peter,
thanks for the fast answer! unfortunately xparticles shader is not available in my network. i will reinstall arnold, but user_data_rgb did the trick already.
I wonder what the log shows when you render a scene. This sounds like the c4d specific shader library is not loaded, which could lead to other problems.