On Fri, 30 Aug 2002 03:29:33 -0400, "William F. Pokorny"
<pok### [at] attglobalnet> wrote:
> I believe Pov-Ray uses a 4 by 4 matrix of doubles internally for each transform
> of anything.

Every transformation structure contains 2 matrixes: normal and inversed one.

ABX

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