[Radiance-general] Are there any way to visualize geometry in rad file?

[Lars O. Grobe]

And one more option - export to inventor or vrml through mgf: 
http://radsite.lbl.gov/mgf/mgfhtml/mgf2inv.html

I do not know about Rhino, but with e.g. Blender you can edit the 
resulting files.

Cheers, Lar.s