Fredrik Eriksson wrote:
> Typically, the perspective transform is defined such that the resulting 
> z-coordinates fall in a suitable range (e.g. [0,1]). Clipping can then 
> be performed without knowledge about the original clipping planes.

I see. So there's extra information, but it might be implicit. Interesting 
approach.

Now I'm curious enough to screw around with the matrixes and math again to 
see if I can figure out what it's doing.

(I'll also mention in passing that the XNA compiler is the first compiler 
I've run into that hoists constant expressions in loops not only out of the 
loop but onto an entirely different CPU altogether. :-)

-- 
Darren New, San Diego CA, USA (PST)
   Forget "focus follows mouse." When do
   I get "focus follows gaze"?

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