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Alain <kua### [at] videotron ca> wrote:
> > Hi,
> > I am searching for the povray pattern that is most suited to creating visual
> > black and white noise similar to what old television screens could display
> > without a signal. what are your advices?
> >
> >
>
> The granite, agate or bumps patterns, properly scalled should gives good
> results. For the agate pattern, you'll need to provide a black to white
> color_map.
> As those noise seems to tend to have few grays, I'd suggest a color_map
> similat to this:
> color_map{[0.4 rgb 0][0.6 rgb 1]}
>
> Change the transition range up or down to get darker or brighter patterns.
> Broaden the transition range to reduce contrast, tighten it to increase it.
>
>
>
> Alain
Indeed, It works pretty well, I used a cell pattern to avoid getting curves in
case of big scaling
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