Where did sun options and ground plane (or infinite plane, I don't remember) went? Are they out of Rhino5 release?
They were there once, and there have been many people talking about them as one of the Rhino5 features.
try menu panels > Sun & Ground Planes
There they are! Thanks a lot Jesus. They used to be somewhere in document properties windows.
It's kind of rare how render settings are distributed... sun is appart from environment or skylight.
Moreover in documents properties windows you can find 4 different options: Rendering, Rhino Render, Rendering (again) and Rhino Render Options. Looks like a little bit messy...