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
