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As the name suggests, PxrLayerSurface is designed for layering materials. You will notice this material node does not include anything that can be overridden by a PxrLayer pattern. This is so users aren't confused by seeing parameters seemingly fail to work because they changed them in a different (or Base) PxrLayer. Think of this node as your global material settings that are obeyed by all of your added layers. This eliminates the tedium of setting parameters to match in different places. This is your material of choice to begin layering looks. For a tutorial using Maya, take a look here.



The PxrLayer pattern node is used to create the actual material layers. These options all provide the ability to enable specific lobes for creating unique looks. These layers can then be connected to a PxrLayerMixer (or multiple) for endless combinations. One example would be a PxrLayer set to look like glass and another to look like a shiny plastic label. These are both connected to a PxrLayerMixer (using the glass as a base) and the result is a glass bottle labeled and ready to render!