Mitsuba

I completely do not expect this to happen, but.... it certainly would be neat to see a Mitsuba viewport created somehow.

https://www.mitsuba-renderer.org/

It's very slick, very fast.  I've spoken to the creator and he has no intention of making it anything more than a research project, so I'm only suggesting this for the "gee whiz" factor it would bring. 

-Paul