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CAD tip CAD tip # 10229:

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Q - question

How to find 3DFaces with degenerated vertices?

A - answer If you need to find 3D faces (3DFACE) with duplicate vertices in your DWG drawing - i.e. faces with overlapping vertex points 1/2/3 - you can use the LISP utility SelFace (formerly Sel3Face).

Download Sel3Face from Download, load the .LSP file with APPLOAD and run the command SELFACE. From the selected 3Dfaces, it leaves only those where it finds degenerated vertices - e.g. with equal first and third vertex (3dface degenerates to a line). The faces will stay grip-selected (e.g. for Delete), or you can use this command on the prompt "Select objects:" inside another command.

Similarly, the command SELFACE selects 3D faces without the fourth vertex, i.e. trilateral 3DFACEs.

You can set the tolerance for matching vertices using the FUZZ variable (setq).

The newer and more advanced utility SelFace (see Download) can conveniently select also singular faces (1 vertex), horizontal faces or faces with zero elevation.

  • Trilateral - faces with three vertices, resp. with the 4th vertex = 3rd vertex
  • Quadrilateral - faces with four distinct vertices
  • Degenerate - faces with 2 matching vertices (from 3; =line)
  • Singular - faces with all matching vertices (=point)
  • Horizontal - horizontal level faces (same elevation of vertices)
  • Zerolevel - horizontal faces in Z=0
  • Cclockwise - faces with counter-clockwise vertices
100% *  CAD 
6.3.2015    11753×  
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applies to: AutoCAD ·

See also:
Tip 14072:How to import an STL, OBJ or 3DS file to an AutoCAD 3D model?
Tip 14056:How to move blocks in the Z axis to the terrain model surface?
Tip 13683:Limitations of the LISP language (AutoLISP, VisualLISP) in AutoCAD LT - what to watch out for
Tip 13038:How to explode 3D faces (3DFACE) into outline polyline?
Tip 11311:Importing STL files directly into AutoCAD - STLin.

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