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If polyline pass through 3D surface, could polyline is cut by 3D surface in the 3D space?.
Such as line trim by another line in the 2D space.
Not fully automatic but there are some options to do this:
http://www.cadforum.cz/cadforum_en/intersection-of-a-3d-curve-with-a-3d-surface-in-autocad-tip9357
Vladimir Michl, www.cadstudio.cz
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