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Last Updated: 10/04/2012 at 21:45

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# Cutting brush

## Cutting interest

The cutting of brush actually includes several tools:

The cutting can cut (no, really?) A brush in two along any desired plane. Certainly, interest tends to decline with improved vertex editing and combination intersection / desintersecion, but there is still useful to transform a cube prism, because if you move you contain some of the vertices and as you place them on other vertices, they will combine to form no more than one, but this may be the cause of a crash, the engine looking for a nonexistent address and sometimes placing two vertices in the exact place the each other (which is impossible for a single object).

## Cutting

To understand how to cut, it is best to go to practice. By subtracting a cube of side 1024 units and adding in the middle of a board of 256 listed and 16 thick, and some lights to illuminate our scene:

The division uses three elements: two marks and a cut line oriented by a normal. The cut line is automatically drawn between the two benchmarks that we will place immediately: select your brush tool and click:

Your cursor will change: it now represents two squares connected by a line that intersects a cube. While keeping your brush selected, do control + right click on one of its corners in the top view:

A pin is placed at the location of your click, and together with the number "1". You just placed the first marker. Repeat on the opposite corner to place the mark 2. The cut line will appear in red between the two pions:

Line cutting is the red line between your two marks. A very important element is attached to your line: a small red segment perpendicular: the Normal. Normal indicates the direction of cutting. The direction of the normal indicates that the portion of the brush will be removed. If you must cut a brush using this tool, but the normal is oriented in the opposite direction, you can return by clicking on this tool:

The proof of this image:

Once your bearings its normal position and your well-oriented, it's time to cut. To do this, you have two choices: cut and remove the part of the brush is pointing normal, or cut out and keep the two separate parts of the brush (in which case, the orientation of the normal is useless). Note that if you make the cut on the red brush, you can not make a conservative cut, otherwise you would end up with two red brush. Also, it does not work.

If you want to cut and turn the party pointed to normal, click on this tool:

If you want to cut and keep the two separate parts of the brush, click on this tool (just next to the above)

All that is nice, but it remains simple. We'll tackle something more complicated: the division into 3D.

## 3D cutting

3D cutting a brush, it is essentially the same as cutting in 2D but in 3D. Until then, ca stands, I'd say it makes sense. The principle of division is to place a 3D third mark. Indeed, earlier we placed two marks, but nothing prevented us from place 3! For this exercise, it is better not cut a board thickness of 16 units, but a cube of 256 * 256 * 256. The results will be more visible:

The key is to invest its benchmark exactly the right place: add by placing them directly on the brush selected in the 3d view and adjust their position in the 2d views to have something similar to this:

The challenge is to understand the placement of normal: it is always placed on the cut line between mark and the mark 2, but it is no longer perpendicular in the 2d views. You have to look in the 3d view to understand:

In this picture it clearly points to the outside and up. This is the top of brush to be removed.

That's it. The disorientation of normal are not simple to understand, but it is best to do some testing. Under UT2003/2004, click to place a fourth mark will remove marks already placed. Under UT99 you may continue to place markers indefinitely, but the cut will not work.

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