In both Windows and Mac, you can use FluidRay RT as standalone renderer and import .3dm files.
In Windows you also have an integration plugin that allows you to render directly from inside Rhino, without having to save to 3dm and then importing in FluidRay.
We are also working on an integration plugin for Mac.
you can import Rhino 3dm files directly to FluidRay. The Rhino integration is only for Windows right now. I don’t use Sketchup or Shade, so I can’t answer for those applications.
Fluidly adjusts to file units both metric and good old feet & inches.
I have been using FluidRay on the Mac for about a year now and just bought 4 licenses for work, 2 Windows & 2 Macs. It is defiantly one the best cross-platform renderers out there, when working with Rhino files. No converting to OBJ or other format. I tested a lot.
Hopefully now that Rhino for Mac is official, we may get FluidRay Mac Rhino integration, just sayin’.