AutoCAD Tip: Reverse Polyline Direction for Accurate Linetypes and Path Operations

Polyline direction is easy to overlook, yet it can affect linetype appearance, variable widths, path-based operations, and the behavior of downstream tools. In AutoCAD, reversing a polyline changes its start point and endpoint without changing its physical location or shape.

The fastest method is the REVERSE command:

• Type REVERSE at the Command line.
• Select one or more polylines.
• Press Enter.

AutoCAD immediately reverses the selected objects. The geometry remains in place, but the object’s internal direction changes from end-to-start rather than start-to-end.

This is especially useful when working with:

• Complex linetypes: Text, symbols, and directional patterns within certain linetypes may display differently depending on the polyline direction.
• Variable-width polylines: A polyline that tapers from wide to narrow will taper in the opposite direction after it is reversed.
• Arrow-like geometry: Flow arrows, route indicators, cable paths, piping diagrams, and directional graphics often need consistent orientation.
• Path-based modeling: Commands such as SWEEP may produce a different orientation or twist result when the path direction is reversed.
• Data extraction and automation: Custom AutoLISP routines, scripts, or external workflows may use a polyline’s beginning and ending vertices as meaningful reference points.

Before reversing an object, it helps to identify its current direction. Select the polyline and inspect its grips: the first vertex is typically shown with a square grip, while subsequent vertices use standard grips. For a more detailed review, use the LIST command or inspect object information in the Properties palette. This is particularly valuable when a polyline contains many segments and its start point is not visually obvious.

You can also reverse a polyline while editing it with PEDIT:

• Type PEDIT.
• Select the polyline.
• Choose the Reverse option.

This approach is useful when you are already using PEDIT to join segments, adjust widths, fit curves, or simplify geometry. Keeping related polyline cleanup tasks within one command reduces unnecessary command switching.

Use caution with closed polylines. Although a closed boundary has no visually distinct endpoint, it still has an internal vertex order and direction. Reversing it can affect the direction of embedded linetype patterns, vertex-based routines, and some specialized applications. For example, closed polylines used as profiles, boundaries, or exported data may need a consistent clockwise or counterclockwise order.

A practical quality-control habit is to standardize direction before issuing drawings, especially when polylines represent routes, circulation paths, utilities, or fabrication geometry. Reverse objects early—before creating dependent annotations, generating 3D features, or exporting data—to avoid later corrections.

For more AutoCAD tools, training resources, and current software options, visit NOVEDGE’s AutoCAD collection. Small commands such as REVERSE can prevent major coordination issues when direction carries design intent.

You can find all the AutoCAD products on the NOVEDGE web site at this page.