...

Switches the layering model.

• Fresnel Blend simply attenuates the base layer using the transmission of the top layer.
• Smooth Coating extends this model by also refracting the rays through the top layer.
• Rough Coating extends the Smooth Coating model by clamping the roughness of the base layer to the roughness of the top layer.
• Auto chooses the model depending on the materials that are being layered.

...