> Are there other codes out there that can operate on a "scene definition
> language" and render a scene albeit with a "shortcut" visualization method.
> 

You should see if this (old) POV-Ray OpenGL Patch does what you need, at 
an acceptable speed:

http://www.daylongraphics.com/other/povray/patches/

It supports wireframe for a bunch of objects, and solid rendering only 
for spheres (with *no* textures, spheres always show in gray).

http://www.daylongraphics.com/other/povray/patches/#solid

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