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CAD tip CAD tip # 7216:

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Q - question

How to use 3DFACEs as a definition for terrain surface?

A - answer If you need to create a terrain model (DTM) from a source drawing containing 3DFACE entities, you may need to first convert these entities to another object type.

With the LISP utility 3DF2L (see you can convert (explode) 3D faces to 3D lines (LINE), which can be used as definition data for computing or analysis of terrain surfaces.

100% *  CAD 
13.2.2010    6207x  
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See also:
Tip 11072:How to make an interference line from 3D Faces?
Tip 11054:Difference volume (3D solid) between two TIN surfaces (sets of coordinates)
Tip 10682:Automatic classification of drawing objects by their properties.
Tip 10229:How to find 3DFaces with degenerated vertices?
Tip 9711:3DConstruct - converting a 3D mesh to a frame construct

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