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Brush Clipping Tutorial (in UnrealED 2)

What is it... ?

Brush clipping is where you assign points (clip markers) onto the face of a brush, then you can clip away a part of the brush. This is called 2D Brush Clipping, UnrealED 2 supports 3D Brush Clipping as well, this uses a third point, but is beyond the scope of this tutorial.

What this Tutorial is going to do...

We are going to do a 2D clip on the red builder brush.
You can use brush clipping on any brush (additive, or subtractive) but for the sake of simplicity we will use it on the builder brush. Tutorial...
Open up UnrealED 2. You should have a blank level. Click on the cube bottom on the left hand side toolbar. You should now see a red builder brush.

Hold down CTRL and in one of the 2D views somewhere near the side of the builder brush (not on the builder brush as this will bring up a menu) right-click. You should now see a clip marker (at first it may look like a vertice, but zoom in and it should look white). Holding down CTRL move the clip marker onto the side of the brush.

Add another clip marker in the same way on the other side of the brush. Make sure you do this in the same 2D view. You should now have something that looks like this...

Click on the builder brush (so that it is selected) and then press the brush-clip button on the left hand toolbar...

This should be the result...

Notice that the part that was destroyed was the part that the normal was facing.

The Other Brush-Clip Buttons...

We know what this one does, it clips away the part of the brush which the normal faces.

This button only works on additives (blue brushes) and subtractives (yellow brushes). As well as clipping the selected brush, the builder brush will turn into the part that you clip away.

This button flips the normal. So in the above tutorial, had we flipped the normal before we clipped, the other half of the brush would of stayed and the half that did stay would have gone.

This deletes all the clip markers so you can start adding them again. Note that if you try to add four clip markers then the same thing will happen (all clip markers will be deleted).

3-D Brush Clipping...
To do three dimensional brush clipping you add a third clipping marker in the same way as said in the tutorial. The difference is that with 2D brush clipping, you work in one of the 2D map views, with 3D brush clipping you have to add add the first two clip markers in the same 2D view and then the third in a different 2D view. The results of 3D brush clipping are not easily explainable so it is best just to try it to see what results can be obtained.