Brush clipping

[The ultimate novice]

Tired of hearing from me yet? I'm soakin' this stuff up, I love it!
Can someone give a brief explanation on brush clipping? If there is no brief explanation, perhaps someone knows of a site with a tut for it. Thanks for putting up with me!

[Fuzzpilz]

There's a lot of tutorials at:
UnrealEd.exe (http://www.planetunreal.com/unrealed)
Wolf's Unreal (I think it's called) (http://unreal.gamedesign.net)
and also some at
the UnrealEd Resource Lab (http://www.planetunreal.com/uedlab).

About clipping:

Do you want to know what it is or what you have to do to achieve it?

[The ultimate novice]

I need to know what it is. I think I can figure how to use it if I know what I'm trying to do!

[Fuzzpilz]

Clipping is cutting your brush along an infinite plane. You define that plane by adding two clip markers (they're under Keypoint), preferably in one of the 2D views so you can position them accurately. You'll see a line connect them. Now select any number of brushes (meaning it's not limited to your red brush). If you now Clip Selected Brushes, the part of the brushes that's on the side of the clipping line where the normal points will be removed. There's a Flip Clipping Normal option so you can decide which part to cut without worrying in which order to place the clip markers. You can also split brushes into two, which of course doesn't work with the red brush. You can also delete all the clip markers at once, which is handy if you use the button instead of manually doing so.
You can also clip brushes three-dimensionally, which is the same thing except it involves three clip markers instead of two.