Fredrik Eriksson <fe79}--at--{yahoo}--dot--{com> 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.

  Ah, now that you mention that, yes, that's probably a very common
technique. Rather than carrying around the distances of the clipping
planes, what is done is to scale the scene so that the clipping planes
are at distances 0 (well, almost) and 1 from the camera. This scaling
is then undone by the perspective projection.

-- 
                                                          - Warp

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