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Clip 3D Polylines

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Hi, I have a grading plan from a consultant which is all 3D polyine contours. What I have to do is clip out the grading of the site exterior from the site interior. All that i have is a 2D polyline which represents that boundary. Is there a way to clip out the 3D polyline contours with a 2D object? Is there a simple way to transform that object into something useful?


Edit: I guess the easiest thing would be if I could clip non coplanar 3D poly's. I want my 2D poly boundary to be able to clip the contours above it. I've tried to extrude the poly and clip or subtract surfaces without any luck.


Edit 2: The attached screenshot shows a corner where the teal boundary is the line I'd like to use to clip the 3D poly contours. There are thousands of contours with some crossing the teal boundary many times so I'm looking for the least "manual" way to do this as I can.

3D Contours.JPG

Edited by jg@swcm
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Use the contours to build a site model

Edit the site model's crop by deleting the one it made for itself and replacing it with your teal line.

Easily done faster than it took to write this post 🙂


site model generated from contours



Same site model clipped to its property boundary.



and you can get all crazy with it by clipping to curves and such if needed.



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