Oleguer Vilella wrote:
> Ok, thank you very much to replay my question. I want to do an image like
> this, and I think the undulations are a sinus function. What do you think?
> 

I think you should read the posting guidelines in povray.announce.f-a-q. 
concerning binary attachments.

Apart from that you can use the sin() function just like JWV explained.

Christoph

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