kurtz le pirate <kur### [at] gmailcom> wrote:

> I have difficulty understanding the relationship between the value of
> the pattern and the value of the function and how to write pattern
> function for Povray.

It CAN get quite confusing.
I've actually spent most of last night and all of this morning doing just that.

I'd take a look at the isosurface tutorial in the documentation, as well as Mike
Williams' excellent and comprehensive tutorial:
http://www.econym.demon.co.uk/isotut/

and Friedrich Lohmueller's extensive and indispensable site:

http://www.f-lohmueller.de/pov_tut/addon/00_Basic_Templates/40_Isosurfaces_basic_functions/__index.htm

> Classic equation for Gauss curve is :
>
>                 x^2     z^2
>           - ( (-----)+(-----) )
>                2.a^2   2.b^2
>    y = A.e

Pardon my ignorance, but what is e, what is A, and what is your "dot notation" -
does that signify multiplication?

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