abs((A*x+B*y+C*z)/sqrt(sqr(A)+sqr(B)+sqr(C))-D)
will do the job

Baillp


3A2### [at] homenl...
> Thanks both!
> Where I need this information for, is a little program I'm writing,
> which does some calculations at points/planes. I want to calculate the
> distance of a point to a plain, with :
> abs(A*x+B*y+C*z-D)/sqrt(sqr(A)+sqr(B)+sqr(C)). I use that distance for
> some things and want the result being displayed by povray, but when
> povray uses another equation, the graphic would be false. How do I have
> to calculate the distance in my program, so that my calculations are
> correct with what povray displays?

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