On 16.10.11 16:28, lucas wrote:
> Hello,
>
> I declared a few functions. I need to use a random generator in one of them.
> Accprding to documentation (http://www.povray.org/documentation/view/3.6.1/228/)
> I thought that I can use function rand() as any other float function, but I
> encountered a problem. I can declare a function like below:

You need to look at the documentation for user-defined functions at 
http://www.povray.org/documentation/view/3.6.1/231/ . Some SDL functions 
cannot be used in user-defined functions. In your particular case, the best 
alternative is a noise function, which provides a 3D randomness that 
probably meets your needs.

	Thorsten

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