[PD] 3d boolean in gem

[greg]

This is about 2 years old I guess, and it's not open source.  But I just
found out about it last night and it's very cool.  It's a procedural
synthesis engine for writing graphics demos.
http://produkkt.abraxas-medien.de/werkkzeug1
I thought the look and feel was vaguely PDish, which led me to wonder if
PD is capable of this sort of thing or not (i've never played with GEM).