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Create 3d Polyline at Midpoint


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I'm having a hard time: I'm creating a middle line in the center of a road route, to verify the distance traveled by trucks. To do this, I create a 3dpolyline by connecting the edges of the path and then create a 3D POLYLINE by clicking on the midpoint of each polyline to draw a median route. As they are many, it is being a complicated job, since I have to click on the midpoint of each one to generate the 3D line that I need. Is there any lisp that can already do this, remembering that it needs to be 3D?

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Is this just to construct the center  3dpolyline or to include the connecting lines? If the latter are both of the edges 3dpolylines? 


A drawing (AutoCAD 2010) containing only the edges would help.

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If you search for pline co-cords by me , 3D pline returns the z value as well, I am on IPad so no code. You can make a list of 3d points.

Edited by BIGAL
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