Constructive Solid Geometry

Who knows about any Constructive Solid Geometry project? Find a splendid project , but its difficult to build for me.
Who knows any more?

You could browse the GtkRadiant source.
Its CSG implementation is not the best, but it works
pretty well in most cases.

Small CSG Tutorial
I mirrored this page about two years ago from the homepage of a demo-programmer. Two days later the page was down and didn’t come back.
minute of silence for the vanished knowledge