[Radiance-general] iges conversion

[Lars O. Grobe]

> I am interested in seeing this work, because I just recently downloaded 
> BRL-CAD for similar purposes. I wish it had an obj-importer, though.

It works. The limitation is that only the iges 4 set seams to be 
supported at the moment. I have imported some files, but could not get 
instances loaded, probably because I had iges 5.1 files (from formZ).

CU Lars.