POV-Ray : Newsgroups : povray.binaries.images : Spherical Planets - Fast Bumps : Re: Spherical Planets - Fast Bumps Server Time
3 Oct 2024 17:13:17 EDT (-0400)
  Re: Spherical Planets - Fast Bumps  
From: Robert J Becraft
Date: 31 Dec 1999 10:16:00
Message: <386cc8b0@news.povray.org>
>>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?


They are small 8 triangle heightfields.

NW--- N ---- NE
|      \     |     /     |
W ---- * ----- E
|     /      |    \     |
SW--- S ---- SE

They vary in size randomly by how far out each of the nodes
NW/N/NE/W/E/SW/S/SE are from the peak at "*".  The peak of each one is
randomly decided as well.

The problem is the placement on the globe... using the rand function, they
are getting placed too regularly, thus covering the entire globe... I want a
rand function that will give me more clustering across the globe.

I've tried a couple of different placement algorithms, but they are defeated
by the regular placement... for example, if I use one that places the
heightfields in smaller clusters that are box shaped around the globe, you
get box shapes instead of random clusters.  This example uses very small box
clusters placed all over the globe from +X 45 degrees to -X 45 degrees.

???????
Robert J Becraft
aka cas### [at] aolcom


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