- correction to writeFace : the fourth point was defined with an incorrect code (http://www.autodesk.com/techpubs/autocad/acad2000/dxf/3dface_dxf_06.htm)
- if no layer name was found, an empty string was used, with is incorrect according to dxf specifications and was rejected by Autodesk DWG TrueView
- the plugin was writting polygons and triangles as LINE, as if PolygonMode GL_LINE was active, and didn't use 3DFACE primitive.
I changed this behaviour to write 3DFACE as default, and LINE when PolygonMode GL_LINE is active.
when reading back the file with osg, the result is now consistent with the source
Tested with osg plugin, FME (Safe software), Autodesk DWG TrueView
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At the moment it outputs DXF for whatever geometry is contained in the node it would be nice to draw the model as it is rendered (points/lines/surface)
If people could also test against other apps that need to read DXF, the format is a bit of a black art and not all importers support all features so it might need some options to tweak the output.
It has some rather clever colour lookup stuff to match real colours against the limited DXF palette. I cracked the code of the Autocad indexed colours!"
