http://www.opendwg.org/files/guestdownloads/DwgFormatSpec13-2007.rtf Description is at page 92 of this document. We are still trying to understand that.
code we've written for that is on src/dwg.spec beginning at line 1208 2010/2/15 Александр Ткаченко <[email protected]> > how to get data from 3DSolid? >
