Need a LISP to Create an Outer Contour from Selected Objects

[p7q]

Hı Everyone

I’m looking for an AutoLISP routine that can take a selection of objects (LINE, LWPOLYLINE, POLYLINE, etc.) and generate a single outer boundary (contour) that follows the outermost edges of these objects.

The goal is to merge or outline only the outermost edges of all selected entities, ignoring any internal edges or overlaps.

The resulting outer contour should be a closed polyline if possible.

The type or layer of the original objects doesn’t matter — only their geometry matters.

Has anyone developed or seen a routine like this, or could point me in the right direction?

Thanks in advance!

[mhupp]

Always check lee mac's website first. might not work if all objects are not touching.

[BIGAL]

If all the objects touch ie no gaps, then this method should work, you draw a random closed pline around your objects, use BPOLY pick a point inside this dummy outer pline, two new plines will be made, erase the dummy and the new pline at the outer, you should now have a new pline wrapped around your objects.

 

[SLW210]

There are some LISPs/programs out there.

 

AutoCAD Architecture FREE toolset has the AECLINEWORKSHRINKWRAP command.  

 

Or... Polyline Outline (Advanced) | Lee Mac Programming.

 

Maybe this... TotalBoundary • Outline creation tool - Programs and Scripts - AutoCAD Forums

 

Maybe something in this thread...