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CreateInstanceData() may be called in multiple threads, and so its implementation should be re-entrant and thread-safe.
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RenderMan will search for shading plugins on demand, under the rixplugin searchpath. Custom shading plugins can be installed in a directory that can either be appended to the /rixpluginpath settings in Rendermn.ini; or the directory can be appended to the rixplugin search path which is emitted by the bridge.
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If you would like RenderMan for Maya or RenderMan for Katana to recognize your plugin and provide a user interface for changing input parameters and connecting output parameters to other nodes, then you will need to create an args file for your shading plugin. The args file defines the input and output parameters in XML so that tools like RMS or Katana can easily read them, discover their type, default values, and other information used while creating the user interface for the pattern node. Please consult the Args File Reference for more information.