...
RixShadingPlugin is a base class characterizing the requirements of a RenderMan renderer from shading plugins: RixBxdfFactory, RixDisplacementFactory, RixDisplayFilter, RixIntegratorFactory, RixLightFactory, RixLightFilter, RixLightFactory, RixPattern, RixProjectionFactory, and RixSampleFilter. These are plugins that implement services for the renderer.
This class provides entry points that are executed with a mix of various frequencies:
...