create boundary by 3dpoly

[neam]

hi every body

I have many many 3dpoly in project and want create boundary inside in 3d polylines by pick inside them.

I remember there was a command in the mechanical desktop called amcontin this feature Which gave you this capability. I don't want flat or explode or convert to lwpolyline them.

Would be grateful if you could provide some guidance on how to do this in autocad by lisp.

[john.uhden]

We just may have to make a smarter UNION on our own, dealing with LWPOLYs
only of course. I doubt that any of us can deal with a region using only
AutoLisp.

[neam]

please see attachment

[marko_ribar]

I watched *.mp4 files and Civil did OK job, but with additional info and MDT created planar boundary... I suppose flat boundary is not what you wanted... I just can't see why you don't want to explode and join to 3dpoly, it's not terribly slower procedure, you just have to select correctly boundary lines... You can make copy of all boundaries and hide them using "Previous" selection, explode all, delete what is not neccessary and join... Finally unhide boundaries... That's all - it's just like explode command never happened...

[neam]

Thank you all
Of course, the guidance of all friends is true and applicable.
I thought we could handle this problem in AutoCAD with the help of Lisp solved this problem in AutoCAD more easily.
Anyway thank you all friends