ron### [at] povrayorg (Ron Parker) writes:

> On Thu, 10 Feb 2000 18:22:51 -0500, TonyB wrote:
> >>Now ask me about form. :)
> >
> >What about it? Tell me more...
> 
> form is used to set the equation crackle uses to calculate the value
> of the pattern at any given point.  The default form is <-1,1,0>, which
> returns the difference between the second-closest point and the closest
> point.  Form takes the distance to the closest point and multiplies it
> by the first term, the distance to the second-closest point by the second
> term, and the distance to the third-closest point by the third term, then
> adds them all up.  Messing with form can give completely different patterns.
> form <1,0,0>, for example, gives you something that looks kinda like a 
> bunch of bacteria.

I assume that you know:

Steven Worley
A Cellular Texture Basis Function
Siggraph 1996

He has created some very nice textures by adding crackle patterns of 
different scale. By this, the pattern becomes some sort of fractal.

Thomas


-- 
http://thomas.willhalm.de/ (includes pgp key)

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