DXF items read and displayed
- 3DFACE, 3DLINE, and SOLID
- LINE with or without thickness and extrusion direction or elevation
- POINT with thickness
- SOLID, CIRCLE, ARC, VERTEX, SEQEND
- POLYLINE -- open or closed
- color and layer attributes
DXF items written
- 3DLINE (all LINE, 3DLINE, and open POLYLINE items without thickness)
- 3DFACE (all 3DFACE, SOLID, and LINE items with thickness)
- color and layer attributes
RIB tags read and displayed
- FrameBegin, FrameEnd
- WorldBegin, WorldEnd
- GeneralPolygon "P" with 3 or more points
- AttributeBegin, AttributeEnd
- Attribute "identifier" "name"
- Attribute "identifier" "shadinggroup" [COLOR#]
