"clipka" <ano### [at] anonymousorg> schreef in bericht 
news:4ad88125$1@news.povray.org...
>
> I guess without the pre-read this will cause a parse error, as y1,y2,y3 
> will be undefined at this point.

Aaah... yes, indeed. In this case that is required. But then, why not put 
the #read as the first line in the #while loop? Then the #if statement could 
be omitted.

Thomas

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