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* Polyface meshes stay one object through DXF and DWG A polyface mesh (POLYLINE flag 64) was read as loose 3D faces. It is now read, drawn, exploded into its 3D faces and written back as a POLYLINE. Hidden edges aren't drawn. A mesh too large for the 16-bit groups 71-74 is saved as 3D faces. Split from #1005. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * A polyface face ends at its first zero index A face record with a gap ([1, 2, 0, 3]) has two corners and is dropped, not read as a triangle. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Polyface meshes: write only faces that name their vertices; ID gives their Z The writer drops the faces the reader would drop, so no record names a missing vertex, and the 16-bit check only needs the counts. ID and DIST give a mesh the Z of its nearest visible edge, as they do for 3D faces. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>