hello,
they both describe plane but the one used in pov-ray allows to describe the
*real* distance from the origin to the plane with the 'D' value, while in
the other it describes the distance from origin to where the plane cut axis
Baillp
ps : you should say "equation" not "equitation" ;)


3A2### [at] homenl...
> Hi,
>
> I was reading the manual about planes, and I saw that povray uses the
> equitation: A*x + B*y + C*z = D*sqrt(sqr(A) + sqr(B) + sqr(C))
> Now I was wondering, why that sqrt(sqr(A) + sqr(B) + sqr(C))? Isn't it
> enough to have A*x + B*y + C*z = D?
>
> Remco Poelstra
>

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