The user experience in RfK 21 is very similar to what was available in RfK 20, but there are some changes that are necessary to transition from 20 to 21.

Reyes/RSL Removal

The Reyes architecture and RSL support have been removed from RenderMan in version 21. RSL removal results in new C++ plugins for Light, Displacement Displacement, and Imager Shaders, replaced Sample and Display Filter plugins.

Lights