The Curve Subtraction (CSub) command is designed to work in 2D with polylines, splines, and other curves. The command subtracts one curve from another, as if the curves denote the boundaries of a certain area from which a section of another area needs to be removed. The usual _SUBTRACT command works in exactly the same way with flat regions. But now, you don’t need to convert closed curves to a region, subtract, and convert them back to curves. The program will do it all by itself. In addition, the program can be used to cut closed and open curves into parts at the points of intersection with other curves. The program can create gaps, set up layers, save or delete the original drawing objects, and trim.

Program capabilities:

• In one click, you can subtract many curves at once. There is no need to call the command hundreds of times for each pair of curves. There is no need to copy the subtrahend curves, as the subtrahend curve will be deleted only after the program subtracts it from all the source ones. You don’t have to select the subtrahend curves with a separate query, but can select all the curves at once. The program will determine what to subtract based on the specified layer.

• The program considers almost closed curves with a small gap to be closed.

• The source curves can be scattered and rotated in 3D space as you like - the program will project everything onto the XY plane of the current User Coordinate System (UCS). You can even work with 3D-polylines.

• Subtrahend closed curves are considered solid areas, and this area will disappear from the original contour, while open curves are considered as cutting lines.

• You can set the gap between the resulting contour and the cut. That is, the program can automatically offset the subtrahend curve and build zones around unclosed curves.

• Any existing or new layer can be assigned to the results and cuts.

• The original curves can be deleted from the drawing or saved.

• You can set up to nine different command styles with different settings and quickly switch between them each time you call the command.

The AVC_CurveSub plugin, in addition to the Curve Subtraction command, also contains the following commands:

• Curve Intersect (CInt)
• Curve Union (CUnion)

Regardless of the Autodesk® AutoCAD® localization language, you can switch the plugin to English, Russian, Italian, German, or Chinese localization.