Re: plasma clouds algorithm ?

From: Roger Bagula (tftn_at_earthlink.net)
Date: 11/18/04

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    Date: Thu, 18 Nov 2004 16:13:37 GMT

    A lot of ray tracing programs have cloud algorithms built in.
    Brice does, I think.
    With IFS it is easy to get cloud/ turbulance effects by detuning the
    ratio in a 3d IFS.
    Noise is what gases as clouds behave like: Gaussian diffusion.
    Another reference is Falconer's fractional Brownian definition
    in his Fractal Geometry.
    anastasiA wrote:

    >Thanks to Stewart and Roger for their prompt responses.
    >
    >Roger's pages are more general and theoretical in nature; they will
    >come handy on a second stage, once I get to actually create such clouds
    >as they show intersting variations and fields of application. Stewart's
    >reference show the precise mathematical background for this fractal,
    >but alas, I'm the visual type of guy and my maths skills are lacking
    >(how the hell do you guys actually pull out an algorithm out of a
    >statement like "For each of the four corners we use a Gaussian
    >random variable N(mu, sigma squared) to generate heights". ;-)
    >
    >The reference to the book "The Science of Fractal Images" was precious
    >though. Most of what is contained in these pages are obviously pulled
    >from this book BUT the latter has actual algorithms. I will study
    >them carefully. Then, I might understand what N, mu and sigma actually
    >mean:-)
    >
    >Good show. Thanks to all of you.
    >
    >--
    >a.
    >
    > 

    -- 
Respectfully, Roger L. Bagula
tftn@earthlink.net, 11759Waterhill Road, Lakeside,Ca 92040-2905,tel: 619-5610814 :
alternative email: rlbtftn@netscape.net
URL :  http://home.earthlink.net/~tftn
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