...

• This is our first release, based on Pixar Animation Studio's internal toolset.
• PxrSurface GLSL shader: 
  • Get a better preview of your work inside Mari.
  • Most lobes are supported: Diffuse, Specular, RoughSpecular, Clearcoat, Iridescence, Fuzz, Subsurface (basic), Glass (basic).
  • Presence support.
  • Solo or mute any lobe.
  • A large selection of texturable inputs have been exposed.
• RenderMan menu offering a number of configurable shortcuts to speed up your workflow:
  • Create a pre-configured PxrSurface with user-selectable channels.
  • Switch to another pre-configured environment map.
  • All these feature are user-configurable through json files.

...

Known Limitations

PxrSurface

• The following features are not implemented:
  • Point light support
  • Specular anisotropy
  • Per-lobe bump
  • Clearcoat absorption.
  • Subsurface scattering only supports the subsurface color and renders it as a diffuse lobe.
  • All volumetric effects: subsurface scattering, single-scattering, glass absorption
• Feature limitations
  • It is impossible to perfectly match a RenderMan render (GLSL and Mari limitations).
  • Transparency is not supported (Mari limitation).
  • Roughness isn't a perfect match (Mari Limitation).

...