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CCAD's AutoCAD Tutorials

Using Fence to Select Objects

Many AutoCAD commands prompt you to Select objects. AutoCAD provides several different methods of selecting objects. Most of the time you probably select objects for commands like Move, Copy, and Erase by picking them individually or with a Window Box or a Crossing Box.

One of the other methods of selecting objects is with a FENCE. A fence is like an open crossing box, it selects the objects touched by the fence. Unlike the crossing box, the fence does not enclose objects, so even if you surround a group of objects with a fence, they will not be selected.

The illustration below will be used to demonstrate ERASE, FENCE.

Using FENCE to Select Objects and Erase

Begin by selecting the ERASE command and typing F for Fence.

You will be prompted for First fence point. Select a point as shown in the illustration.

Next you will be prompted for Undo/<Endpoint of line>. Select the second, third and fourth points as shown. If you make an error, type U to undo a fence point.

After you select the last fence point, press ENTER to stop selecting fence points.

Probably the best use of Fence is with the TRIM command. Fence allows you to trim a group of objects, instead of individually selecting objects.

The illustration below will be used to demonstrate TRIM, FENCE.

Using FENCE to Select Objects and Trim

Begin by selecting the TRIM command and selecting the two blue lines indicated as cutting edges. Press ENTER to exit the cutting edges portion of the command.

When prompted to select the object to trim, type F for Fence. Pick the fence points as shown above. Exit the TRIM command by pressing ENTER.

To EXTEND objects using the FENCE option, select the EXTEND command and the blue line as the boundary. Press ENTER to exit the boundary portion of the command.

When prompted to select the object to extend, type an F for Fence. Pick the fence points as shown below.

Using FENCE to Select Objects and Trim, trimmed

Exit the EXTEND command by pressing ENTER.