I'm working on the LISP-Part of a DWG-to-own-format-converter. We use a LISP script on BricsCAD to read out the geometry information from the DWG files. It worked well with most 2d and 3d drawings, but now we've encountered a case, where certain walls in a drawing just didn't show up.
They turned out to be solids (like in the attached file strange solid.dwg). Does anyone know a way to convert these into 3d-Solids or Polyface-Meshes? 3DConvert and explode won't work on them.