Short procedure to remember:
to Meshlab
1. While Civil surface is a spectacular (Autodesk internal) object, the export and conversion is not straightforward.
2. Explode surface 1x to achieve the block and 2x to get a bunch of 3D faces
3. Save the file as .DXF
4. Open .DXF in FBX Converter and convert .DXF to desired format (.OBJ preferred)
5. .OBJ could be opened and edited by Meshlab. Works both with BLOCK and 3DFACES got by initial exploding
to 3D PDF
1. while those Peterpuffers from Adobe left the 3D support of Acrobat gone, there are 2 main ways to get it:
a) use 3rd party solution – e.g. Haru PDF library
b) use the older Adobe Acrobat 2009 with 3D PDF support and import .stl object into
c) import AutoCAD model into Bentley View and print 3D PDF – more straighforward