Export a Contour/Feature Line/3D Polyline from a surface
http://forums.autodesk.com/t5/AutoCAD-Civil-3D-Wishes/Export-a-Contour-Feature-Line-3D-Polyline-from-a-surface/td-p/2652086
I cannot seem to find any way that you can take a surface and export from that surface, a Contour or Feature Line from that surface, without having to copy and explode it. Maybe it's possible to create a featureline from a surface at a specific elevation, but I am unaware of it, and can't seem to find directions for it. Thanks!

RD
Itklvrynks
10:57 AM
Hi RD,

To get contours from a surface, turn on the contours of the surface and
go the Surface menu> utilities> extract objects from surface. You could
also extract triangles, borders, points, etc as long as they are turned
on.

To create a featureline from the surface levels, create a featureline as
normal and assign levels from the surface model. Grading> edit
featureline levels> levels from surface.

Hope that helps.
*Harold Alberto
12:00 PM
I cannot seem to find any way that you can take a surface and export from that surface, a Contour or Feature Line from that surface, without having to copy and explode it. Maybe it's possible to create a featureline from a surface at a specific elevation, but I am unaware of it, and can't seem to find directions for it. Thanks!

RD
Itklvrynks
10:57 AM