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Maddi

Geforce 4 and lower / User Clip Planes

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Hi All, Is it true that Geforce 4 and lower don't have UserClipPlanes ? ( I mean in Hardware ), I thought this has been a standard feature since ever ?! Cheers, Maddi <edit> Or does my driver suck ? </edit>

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Courtesy of #graphicsdev:
< Phantom> glGetIntergerv() with GL_MAX_CLIP_PLANES will return the number of user clip planes support (pg145 Red Book, 4th Ed)

So that should tell you how many clip planes are allowed. As far as whether or not they function properly...well that's a different game.

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I think I've once read that user clip planes are in fact emulated using tex kill and a texcoord gen function.
The same paper (I think it was official from NV) stated that in fact, for each plane, you're losing 1 texture pass.
By sure means, this is the easiest and less expensive way to get a not-so-asked-for functionality so this may make sense, even if the performance would really be sub-optimal when compared to a real clip plane.

So, yes, it could be possible.

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