I extracted a YACC style grammar from importCSG.py in FreeCAD. It's a bit long to post so I have put it into github. https://github.com/bobc/csg_tool/blob/master/grammar/CSG.y I have run the file through yacc and it seems ok, otherwise I have not verified the syntax. FreeCAD seems to support most of the CSG functions, notable exceptions are hull, minkowksi and a handful of others including glide, offset, resize, subdiv. bob On 17 May 2015 at 23:53, bobc <bobcousins42@googlemail.com> wrote: > I am interested in this too, I am just thinking of writing a parser, so a > grammar would be useful. If there is nothing already, I will try to put one > together. > > bob > > > > -- > View this message in context: > http://forum.openscad.org/Specification-of-CSG-file-format-tp12676p12681.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

On 05/18/2015 09:41 PM, Bob Cousins wrote: > FreeCAD seems to support most of the CSG functions, notable > exceptions are hull, minkowksi and a handful of others including > glide, offset, resize, subdiv. > Both glide and subdiv are not implemented in OpenSCAD (only throw an assertion error). With the latest release there is at least also text(). Note there is also a Google Summer of Code project going on which plans to create an importer for BRL-CAD that will read CSG files. (http://brlcad.org//wiki/User:Andrei.ilinca24) ciao, Torsten.