A closer look at Wipeout command of AutoCAD
Despite its great feature it always remained one the least used commands in AutoCAD. This command can be used in crowded drawings to mask the background and you can even create blocks with this command that always remain opaque to the background entities of the drawing.
In this article I will try to explore features of this command with relevant examples where ever possible.
To use wipeout tool select it from expanded draw panel of home tab or use its command equivalent WIPEOUT. On selecting this command you will be prompted to specify points for your wipeout boundary, click at points in a region where you want to mask the background objects and press enter. In the image below I have used wipeout on the hatched region inside the rectangle to partially hide hatches.
You can also use a polyline geometry made entirely of straight lines for creating wipeout regions, polylines containing arcs can’t be used to create the wipeout objects. To use an existing polyline start wipeout command and select polyline from command line and click on closed polyline from drawing area. You will notice that command line will now prompt you to specify whether you want to delete the polyline or not which was used to create wipeout. Select yes (or no if you prefer) and your wipeout will be created.
The wipeout frames behave dynamically, by changing geometry of wipeout frame the region inside wipeout will also change accordingly.
By default wipeout boundary will remain visible in drawing area and it will also appear in the plot, but you can change visibility of wipeout boundary by using WIPEOUTFRAME system variable. To change visibility of wipeout frame you can also use Frames option from command line after invoking wipeout command as shown in image below.
The values of WIPEOUTFRAME system variable will have effect on drawing as shown below.
0 Frame will hide from drawing area and plot
1 Frame will remain visible in drawing area and plot
2 frame will remain visible in drawing area but it will hide from plot
Even if you hide a wipeout frame in your drawing area it can still be selected, but if you want to make the wipeout frames completely non-selectable then change FRAMESELECTION system variable value to 0.
Creating wipeout blocks:
Using wipeout feature you can create blocks that can always hide objects behind it. To create such type of blocks you need to first create a simple block and then add a wipeout boundary behind it. Let’s take example of this oven from design centre blocks which I will use to create the block with wipeout feature.
In this case we already have a block so in order to edit it double click on the block to go to block editor.
Now select wipeout command from expanded draw panel of home tab and draw a frame enclosing this block completely. You will notice that the block hides behind masking, to make it visible again select all objects of blocks (even in hidden state you will be able to select objects of block) then right click go to Draw Order and select Bring Above Objects from contextual menu. Your cursor change into a pick box, select wipeout boundary and press enter. You will notice that now block becomes completely visible, close block editor after saving your block.
Now whenever you enter this block over crowded drawings it will always hide underlying geometries.
About the Author:
Jaiprakash Pandey is CAD Corporate Trainer specializing in AutoCAD, CATIA and other CAD software’s. He is an Autodesk AutoCAD Certified professional and an Autodesk expert elite. He is a regular contributor to AUGI World magazine and he has also developed AutoCAD video courses for pluralsight, his own platform SourceCAD and other E-Learning businesses. For free AutoCAD tutorials by him visit SourceCAD.