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CAD tip # 8322:

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How to extract intersection lines or edges from 3D objects?

You can extract (copy) outline edges or 3D intersection lines (curves) from any 3D solid or surface models in AutoCAD.

This can be done with the XEDGES command, where you just select a 3D solid (3DSOLID), 3D mesh (3DMESH) or 3D surface (SURFACE) object. Its edges (wires, wireframe) are extracted as new simple entities in 3D - lines, arcs or splines (as neccessary - from the geometry shape).

If you want to get the 3D intersection curve of two separate 3D solids (e.g. a conic section), first convert these solids to a single body - e.g. with the UNION command.

If you want to extract only a selected edge, use the command OFFSETEDGE with the option Distance = 0.

The extracted geometry may be obscured by the source object so you may need to delete or hide the object.

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13.11.2011 20036×

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See also:
Tip 11830:	How to influence linetype scale or color for hidden edges in documentation views?
Tip 11072:	How to make an interference line from 3D Faces?
Tip 10499:	How to fillet edges between two 3D solids?
Tip 10237:	Arc bridges (gaps) in line intersections.
Tip 10054:	Boolean operations on 2D polylines.

Selected tip: Why are complex linetypes scaled properly only in the modelspace and not in the paperspace/layouts?

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