"Lisp" projection 3d polyline to 3d face

[Sathalex]

Hello everybody!
Does anyone have a similar program?
3d faces obtained by extraction from the surface.

[marko_ribar]

Maybe flatten your 3d polyline to lwpolyline and then apply something like this :
http://www.cadtutor.net/forum/showthread.php?100610-longitudinal-profile-from-3D-polyline/page2&p=#12

Not sure ab this one (it does this in plane of 3 starting vertices of 3d polyline) - 3d polyline to lwpolyline you can use code from here :
https://www.theswamp.org/index.php?topic=42773.msg479708#msg479708

So for what I meant you basically need to collect vertices of 3d polyline, remove their Z coordinate and entmake LWPOLYLINE with X and Y coordinates... Have not time for that one now, but it's simple task... Or maybe the best - just explode 3d polyline into LINES, then select them all, go to properties palette and change their start/end Z coordinate to 0.0... Finally just join those flattened lines to LWPOLYLINE either with JOIN command or through PEDIT - Multiple...

Regards, M.R.