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CAD tip # 12239:

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How to extract isolines from a surface of a 3D object?

With the command SURFEXTRACTCURVE cou can create a spatial surface curve on a 3D solid or 3D surface. Select the source 3D object and use the Direction option to switch the U, V isoline direction to extract the requested curve.

The resulting curve is a spline for smooth sorfaces. Use the SPLINEDIT command to convert it to a polyline. See the example of a blue polyline and the original purple spline:

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16.5.2019 399×

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applies to: AutoCAD ·

See also:
Tip 11939:	How to extract pipe centerlines from 3D point clouds?
Tip 9917:	Cannot create terrain model from attached point cloud in AutoCAD Civil 3D 2015.
Tip 9735:	How to convert a .THING file to a 3D CAD model?
Tip 8322:	How to extract intersection lines or edges from 3D objects?
Tip 7616:	Convert photos to 3D model - also for patios.

Selected tip: How to create a 3D model from 2D views.

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How to increase contrast between a constrained and underconstrained curve in an Inventor sketch? « | » UnfoldRS - unfold 3D surfaces to 2D in AutoCAD.

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