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Pentagram
03-20-2003, 12:42 PM
Does anyone know where I can get more info on this extension?
I don't seem to find it in the nvida extensions file (, the sgi extensions registry, or anywhere else)
Also on what cards is it supported?

Charles

cass
03-20-2003, 02:00 PM
Hi Pentagram,

There's a little information on it in the shadow volume slides that I presented at GDC. The extension spec will probably not be released until we are shipping hardware that supports it.

Thanks -
Cass

Pentagram
03-21-2003, 12:20 AM
The slides are where I got the idea of the depth bounds. There it seemed the extension was already available.
Also is there any change I can "emulate" that extension by using 2 near plane aligned user clip planes?
Well I could try it myself but maybe some of you have experience with it.

Charles

cass
03-21-2003, 01:01 PM
No, unfortunately user clip planes clip based on the position of the incoming geometry, while depth bounds test discards fragments based on the depth of the pixel.

That's one of the most common confusions about this technique though.

Thanks -
Cass