- First you have to install the procedural plugin (see third-party shaders). You can move the binary to the C4DtoA/plugins/procedurals folder, or alternatively set the ARNOLD_PLUGIN_PATH environment variable.
- Create an Arnold Procedural object (Plugins > C4DtoA > Arnold Procedural).
- You should see the mandelbulb listed in the Type field of the Arnold Procedural when it's loaded properly.
- Select the mandelbulb from the list and setup the parameters of the Mandelbulb tab.