In article <386cbaca@news.povray.org>, "Robert J Becraft" 
<cas### [at] aolcom> wrote:

> Attached is my first round at adding bumps to a planet object.  It takes
> about 3 minutes to render.
> 
> PROBLEM:
> 
> Using the rand(X) function in POV, I find that it creates too even a
> distribution in the placement of all the objects in the picture.  Notice
> that the band of green bumps are fairly evenly spaced around the globe.

Interesting, looks like a lot of little islands...
Did you cover the sphere with a lot of randomly positioned bump-spheres 
to get this? How much memory did it take?


> Does anyone have a better rand function that will get me better clumps of
> land mass???

Sounds like you want the noise3d() function or my eval_pattern() 
function, both of which require a patch(so they can't be used with the 
official POV), and neither of which have been incorporated into MegaPOV 
yet. Well, noise3d() can be used in an isosurface function, but not 
anywhere else, I wrote a little patch which allows it to be used 
anywhere, it is that patch I am talking about.

Sorry, I don't know any way to accomplish this without using a patched 
version.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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