Many users have encoun­tered sim­i­lar prob­lems, they wish to block car­pet or oth­er devices when arrang­ing for the fur­ni­ture, as shown in the fol­low­ing pic­ture:

The sofas in the draw­ing block the car­pet and make the draw­ing more clear. How to do this? It’s Wipe­out.

Wipe­out is a basic draw­ing func­tion in CAD, which can be found in the draw­ing menu. If you are using 2D draw­ing, you can find it at the drop-down but­ton.

 Wipe­out is an uncol­ored and opaque graph­ic object that can block the graph­ics behind. There are two ways to cre­ate it: direct cre­ation and con­ver­sion from closed poly­lines.

  For sim­ple square blocks, we can cre­ate by snap­ping end­points. For com­plex blocks, we’ll need to use the edge line of the block to cre­ate poly­lines. It would be trou­ble­some to cre­ate poly­line after the draw­ing of blocks. So if we want to cre­ate blocks just like the above pic­ture, we’ll need to fol­low the steps below:

1. Draw the out­er con­tour.
2. Con­verse the out­er con­tour to closed poly­lines.
3. Exe­cute the Wipe­out com­mand, enter P (for poly­line), select the out­er con­tour of blocks to form wipe­out that match­es the blocks.
4. Draw the graph­ics in the mid­dle of the graph­ics.
5. Make the Wipe­out at the bot­tom and make sure all the graph­ics are on top of the wipe­out. Select all the graph­ics and wipe­out and you have made it.

There is a prob­lem in using the Wipe­out com­mand: the Wipe­out com­mand doesn’t sup­port cir­cles and arc seg­ment of poly­line if you can’t make the out­er con­tour of arc a nor­mal wipe­out.

In these cir­cum­stances, what should we do? There is anoth­er tool: Super­hatch, which gen­er­ates wipe­out area just like Hatch. The out­er con­tour of such blocks doesn’t have to con­vert to poly­line, which saves you trou­ble but gives you the out­er con­tour with an arc. It would be much sim­pler to han­dle blocks already be done. The fol­low­ing is an exam­ple of a tea table to show the func­tion:

The steps are as fol­lows:

1.Window select the inner graph­ics and select Iso­la­tion option in the right-click menu to tem­porar­i­ly hide the inner graph­ics.

Please note: The Iso­la­tion func­tion is only avail­able in high­er ver­sion of CAD, so if you don’t have this func­tion in your CAD, you can move the inner graph­ics away and move them back lat­er; or you can copy a bor­der­line and move the wipe­out area back.

2. Exe­cute the Super­hatch func­tion in the exten­sion tools, click the Wipe­out in the Super­hatch dia­log box, as shown in the fol­low­ing pic­ture.

3. The sys­tem prompts to spec­i­fy inser­tion point, move the cur­sor to cre­ate just like cre­at­ing Hatch, as shown in the fol­low­ing pic­ture.

The ben­e­fits of using this way are that it will direct­ly gen­er­ate Wipe­out no mat­ter it’s bor­der­line, closed poly­line or sep­a­rate line or arc.

4. Press Enter to con­firm and fin­ish the cre­ation of Wipe­out.

5. Right-click and can­cel the iso­la­tion of the object in the right-click menu to show all the objects. If there are graph­ics that are blocked, select Wipe­out to make them at the bot­tom.

6. Select all the graph­ics and Wipe­out, enter B and define as blocks.

7. Move the defined “tea table” block to the car­pet, and the block will auto­mat­i­cal­ly cov­er the objects behind, as shown in the fol­low­ing pic­ture.

Please note that the tips men­tioned in this arti­cle apply to Gstar­CAD and sim­i­lar CAD sys­tems that have Wipe­out and Super­hatch func­tion.