CAD tip # 11025:

Question CAD
% platform category

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 18120×

Comments Tell a friend

Prices - CAD eShop:

AutoCAD

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: Which vector formats are supported by AutoCAD?

Back All CAD Tips

Mass property depending on the current LOD in an Inventor assembly. « | » How to map properties from an imported STEP file to Inventor?

Have we helped you? If you want to support the CAD Forum web service, consider buying one of our CAD applications, or our custom software development offerings, or donating via PayPal (see above). You may also add a link to your web - like this "fan" link:

CAD: OS: Categ:
Text:	FAQ glossary

Featuring:
Increase your productivity with our set of BIM add-on functions for Autodesk Revit
CADstudio Revit Tools More info

Please use these tips at your own risk.
Arkance Systems is not responsible for possible problems that may occur as a result of using any of these tips.

	CAD Forum - tips, tricks, utilities, help, how-tos and FAQ for AutoCAD, LT, Inventor, Revit, Map, Civil 3D, Fusion 360, Forma, 3ds Max and other Autodesk software (support by Arkance Systems) - see About	Arkance Systems CZ s.r.o. (CAD Studio) - Autodesk Platinum Partner & Training Center & Consulting Services Partner	CONTACT: webmaster.cz@arkance-systems.com tel. +420 910 970 111
	Copyright © 2024 \| Advertise with us \| Online privacy

CZ \| EN \| DE
Login or
registration
	Visitors: 5692