"slehar" <sle### [at] gmailcom> wrote in message 
news:web.48726e7c9a281388f75a90cb0@news.povray.org...
>
>
> But neither of the three will allow me to use pre-defined patterns such as
> checker, wood, brick, hexagon, and apply a distortion to them, will they? 
> So I
> would have to re-write the code for those patterns in order to apply the
> distortion to them?
>
> Is there a way to pass a distorted <x,y,z> to those patterns? Something 
> like
> this?
>
>  pigment {
>    checker (invergence(<x,y,z>)) // Passing distorted <x,y,z> to Checker
>    ...

You can use a pre-defined pattern such as checker, wood, brick etc. in a 
function. You can then mathematically distort the function and use the 
resulting function in a pigment. I see that SharkD has provided a link to a 
wiki page that describes that sort of approach, albeit to achieve a somewhat 
different result.

I just wanted to throw into the discussion the idea of using the black_hole 
warp, which can give you a visual effect that is somewhat similar to the 
image of a striped cylinder that you linked to. It should be a lot simpler 
to implement if you just need it to illustrate a story, but may not be 
sufficiently mathematicaly accurate for your needs.

Regards,
Chris B.

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