I have modified the shapes2.inc file with bounding boxes for the regular
polyhedrons.  

In a picture I was rending (where I think I used about 24 of these
things) the render time had a very noticeable speedup.

Tetrahedron     bounded_by {box {< -2.5,-1.15,-1.5>, <2.5,3,2.85> } }
Octahedron      bounded_by {box {< -1.25,-1.75,-1.25>, <1.25,1.75,1.25>
}}
Dodecahedron    bounded_by {box {< -1.25,-1.25,-1.25>, <1.25,1.25,1.25>
}}
Icosahedron     bounded_by {box {< -1.25,-1.25,-1.25>, <1.25,1.25,1.25>
}}

-- 
Tom A.
See everything; over look a great deal; correct a little.  -Blessed Pope
John XXIII

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