How to block graphics behind blocks? How to easily use Wipeout in CAD?

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.