Unlike other RenderMan bridge products, PxrLayerSurface is not exposed in the interface because all layerable parameters must be present in order for layering material parameters to work in Houdini.
You can find out all the details of PxrSurface and its layerable parameters by visiting the Pixar Surface Materials.
For the easiest way to create a simple layered material, go to the RenderMan Menu and choose Create Material and select Pxr Layered Surface. We will create and network a layered material in the MAT pane.
PxrLayer
We can override the parameter parameters in PxrSurface using the PxrLayer. Connect the output of PxrLayer to PxrSurface's PxrLayer. options.
In this example, we set a green diffuse color in PxrSurface. Then we layer a PxrLayer node on top that has a cyan diffuse color. Note that one color covers the other, so we need to alter the Mixer node.
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PxrLayer Mixer
We can combine layers using PxrLayerMixer. Connect the output of PxrLayerMixer to PxrSurface's PxrLayer.
The mixer is where we decide where and how layers are mixed using masks. Below, patterns are connected to the Mask in the Mixer.
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We can layer specular, iridescence, and other illumination lobes.
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