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On 24 Dec 2000 12:17:09 -0500, Warp wrote:
>Ron Parker <ron### [at] povray org> wrote:
>: They're not really. The fourth column is just a convenient way of specifying
>: the translate component. You could easily take that out, invert, and put
>: it back.
>
> But aren't the rays also translated with the inverse translation of the
>object? Isn't the whole 4x4 matrix inverted?
Yes, but it's easiest to invert the 3x3 matrix and then tack on the inverse
translation than to try to invert the whole thing.
--
Ron Parker http://www2.fwi.com/~parkerr/traces.html
My opinions. Mine. Not anyone else's.
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