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Spot elevation between polylines with elevation


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Hello i have question. I need lisp to extract elevation in spots from polyline surface.

I know for civil 3d and surfaces i work with this but for this project i need to make same thing in Autocad.


I know the math for interpolate but dont know how to make it. (dont have good idea for now)


Thank you all for support and help. :) 


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  • 3 weeks later...

Civ3D use the spot on a 3d triangle for the Z value.


I am pretty sure this has been answered before it may be at Forums/Autodesk. Google more.


The only issue is the ray line direction you can get closestpointto to easy but its angle will vary from the point to the contour line.



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