olasov@heathcliff (Benjamin Olasov) (03/06/89)
AutoCAD's IGES preprocessor typically creates a form 1 (coordinate pair) format for entity type 106 (a copious data entity [a 3DFACE in AutoCad nomenclature]). Entity 106 is handled by the tranformation matrix (entity 114) if the coordinate pair format is used. It doesn't seem to be possible to coerce AutoCad to produce a form 2 (coordinate triplet) format instead in its IGES output file (IGESOUT). This makes reading the IGES file produced by AutoCad's IGES preprocessor by a post-processor like Neo-Visuals or other 3D and animation software virtually impossible. It also makes it very difficult to produce a LISP based object file that could be read by the S-Geometry package on a Symbolics LISP machine. Has anyone come up with, or discovered, a package that can produce an IGES file specifying copious data entities as coordinate triplets (i.e. a 2 flag on the 106 entity)? I'd also be interested to hear whether anyone has already written some code for translating an AutoCad database of any format into a (LISP Machine) S-Geometry readable object file. Cheers, Ben