In article <3e39314b$1@news.povray.org> , "Greg M. Johnson" 
<gregj:-)565### [at] aolcom> wrote:

> // Scene file as follows  uncomment one declaration of rah or the other:
> #declare RRR=seed(123);
>
> #macro ra()
> rand(RRR)-0.5
> #end
>
> #declare n=0;
> #while(n<1000)
>
> // if you uncomment the line below
> // you get what I want
> // #declare rah= 0.9*(rand(RRR)-0.5)*x;
>
> // if you uncomment the line below
> // you get a variable that has x,y,z
> //#declare rah= 0.9*ra()*x;

Of course.  The parenthesis in your macro are missing.  Thus both cases are
not identical.  RTFM.

    Thorsten

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