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This Bxdf is based on Brent Burley's extended material model, introduced in "Extending the Disney BRDF to a BSDF with Integrated Subsurface Scattering" at SIGGRAPH 2015.  

It  It is a nice and simple physically-based model with a concise number of parameters, but at the same time it can represent allowing for a wide range of materials, including diffuse and specular reflection and transmission, clearcoat, sheen, and subsurface scattering.  All  

All CG animations made at Walt Disney Animation Studios use this material model .  The and the source code for the Pixar version of this material, PxrDisneyBsdf, is available among the bxdf code examples.

Examples of different material parameter settings for PxrDisneyBsdf: metallic reflection, thin diffuse transmission, thin specular transmission, subsurface scattering, and glass refraction and reflection.  Image inspired by Figure 1 of the Burley Bsdf paper.

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