CAD tip # 11025:

Question

CAD

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How to create an axis of two curves? (average curve)

To create an axis geometry in a middle of two general curves (lines, polylines, splines) - e.g. a river axis, minor contour etc. - you can use the free LISP utility CurveAxis.

Download the VLX file from Download, load it into AutoCAD with APPLOAD and type the command CURVEAXIS. Select both border curves and specify the requested precision (number of axis segments). You can create the centerline axis as a polyline, a 3D polyline or a spline. The resulting polyline can be then simplified e.g. with PLdiet.

You can also try the CURVEAXISRB command which utilizes the "rolling ball" algorithm.

For both algorithms, you can also set a non-symmetrical axis, i.e. divide the curves e.g. to 1/4 (enter 4.0) or 3/4 (enter 4/3, 1.3333).

ACAD

*CAD

29.7.2016 21257×

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applies to: AutoCAD ·

See also:
Tip 14039:	How to display the total volume or surface of 3D solids in DWG?
Tip 12766:	Lines with a single grip, incorrect osnaps, intersections, offsets, hatches - CheckLarge
Tip 11989:	How to dimension an ellipse in AutoCAD?
Tip 11522:	How to create 3D splines in Fusion 360 - e.g. for pipe axes?
Tip 9829:	DrGrid - parametric grid for AutoCAD drawings.

Selected tip: How to set the displayed precision of a table cell?

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