On Mon, 26 Apr 2004 13:07:56 +0200, lars petter <lar### [at] higno> 
wrote:

> Hi. I've got this difference object:
>
> difference {   // a cylinder subtracted with another cylinder with 
> smaller
> radius -> a ring
>
>         cylinder {
>           <5, 0, 5>,
>           <5, 1, 5>,
>           1
>           pigment { rgb <1, 0, 0> }
>         }
>
>        cylinder {
>           <5, 0, 5>,
>           <5, 1, 5>,
>           0.9
>           open
>        }
>     //scale <2,1,1>   is this the right place to insert the scaling?
>
> }
>
> if i try to scale it in x- or z- direction, the object simply fails to 
> show
> in the render. scaling i y-direction however, works fine.
>
> why is this?
>
> -greets,
>     lars petter

I've also been caught out by this; the help file states that scale is used 
to change the size of an object or texture pattern with a origin sphere 
example. IMHO an additional non-origin sphere to demonstrate how it also 
affects the vector location(s) would make this a bit more obvious. The way 
scale works makes sense if you stop and think about it, but it's not 
something you you might stop and think of :)

Actually I'll post this to povray.documentation.inbuilt as a suggestion.

--
Phil Cook

-- 
All thoughts and comments are my own unless otherwise stated and I am 
happy to be proven wrong.

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