AutoCAD Civil 3D

[#1]

I need to convert my surface boundary to a polyline so I can use it to clip another surface. Is there a simpler way than tracing it with the polyline command?

[#2 · Accepted solution]

Yeah. Turn your border on within your surface style, select surface and within contextual ribbon there is a extract objects icon, then a dialogue will pop up asking what you would like to extract. Uncheck everything except for border, hit ok. Border will be extracted as a 3dpolyline. Turn off border within surface style, CONVERT3DPOLYS, command to convert into polyline.

[#3]

also after getting a polyline from this method remember to use drawing cleanup with the simplify linear objects and set it to 0.5 tolerance to reduce the number of vertices drastically.

[#4]

Thanks guys!