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Constructive Solid Geometry

Started by AndyGeers Jan 19, 2003 at 3:13 PM 4 replies 1.5k views

Original Post

Jan 19, 2003 at 3:13 PM

Hi there, Does anybody know of any good tutorials on the web about Constructive Solid Geometry, such as is used by Unreal? I found one at http://www.cfxweb.net/~aggrav8d/tutorials/csg.html but it doesn''t go into very much detail at all. If not on the web, then any good text books covering the topic would be greatly appreciated. Thanks in advance, Andy Geers

joanusdmentia

Jan 19, 2003 at 7:00 PM

Constructive Solid Geometry (CSG) is the addition/subtraction/intersection of 2 or more meshes. e.g. if you have a large cube and a small cube thats overlapping with the large cube, subtraction of the small from the large would give you the large cube with a chunk cut out of it where the small cube was.

[edit]
CSG was used in Unreal??
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[edited by - joanusdmentia on January 19, 2003 8:01:30 PM]

p4n1c

Jan 19, 2003 at 8:08 PM

Yes, I believe Unreal did use CSG. But not like in Quake, where you subtracted/added/intersected brushes, in Unreal, the world was treated as a huge piece of clay basically and you cut out your world using different shapes.

RavNaz

Jan 19, 2003 at 8:18 PM

not much help really but...

IMO: best way of doing CSG is using BSP trees, they are very good for this.

I vaguely remember seeing something on flipcode->ask midnight..try that...otherwise try searching BSP/CSG

AndyGeers

Author

AndyGeers

Jan 21, 2003 at 12:21 PM

I just noticed that there''s quite a helpful section on the subject in the BSP Tree FAQ listed in the resources section.

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