Creating Boundaries Automatically With the BOUNDARY Command

Creating Boundaries Automatically With the BOUNDARY Command

We may sometimes have to define some areas as boundaries in AutoCAD. Boundaries come in handy in quantity surveying and 3D profiling. Using a POLYLINE to mark out the perimeter of the area is a solution, but a more elegant one is using the BOUNDARY (formerly named BPOLY) command.

The BPOLY command was first introduced with AutoCAD 13 and since the 2006 edition, it has been named as the BOUNDARY command. Good thing that both work when entered in the command prompt.

You can activate the command situated in the "Draw" panel in the "Home" tab of the ribbon menu by typing either BPOLY or BOUNDARY into the command prompt.

Command: _BOUNDARY

The easiest way of creating a boundary is clicking within the boundary using "Pick Points" (1)

The bounding POLYLINE will be ready as soon as you click within the boundary (it should be a closed area).

Important Note: With AutoCAD 2010, little gaps and spaces in the perimeter of the area are (can be) omitted while specifying areas in the BOUNDARY and HATCH commands. AutoCAD simply ignores the little gaps and draws the boundary lines.

Other Options in the BOUNDARY Dialog Box:

Pick Points: Finds the boundaries of the area you clicked on. Also detects any islands within the boundary too.
Island Detection: Decides whether closed sections (like CIRCLE and RECTANG) are to be included or excluded from the boundary. Island Detection ON, Island Detection OFF.

Boundary Retention: Determines whether the boundaries are to be kept as they are. Outputs can be as two types of objects.

POLYLINE: This is the default value. You may calculate perimeters or areas with the resulting POLYLINE. The "Retain Boundaries" option would not work here. REGION: Makes the boundary a REGION object. You may use this surface for solid modeling operations. If switched on, it also keeps the bounding POLYLINE. Boundary Set: Unless you specify otherwise, all objects on screen will be used. It will find the boundary that is set by a group of objects.

If you have objects that you don't want to include in boundaries, hit the "New" button first. Select all objects on the screen and remove the ones you want to exclude hitting the "R" key. Those objects will not be taken into regard when creating boundaries.

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