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I've created a bozo pattern, and after playing around with the various
turbulence parameters (omega, lambda, and so forth), discovered an odd
effect.
Namely, at certain points in the pattern, there are very obvious
parallel bands where the bozo pattern abruptly changes. Why does this
happen? (And the question I'm really interested in, how can I prevent
it from happening?) I've included a small example source below, and
placed a rendered version at:
http://www.gate.net/~shipbrk/raytrace/temp/bozobands.jpg
#declare TestTexture = texture {
pigment { bozo
colour_map {
[0.00 colour rgb <1,0,0>]
[0.50 colour rgb <0,0,1>]
[0.50 colour rgb <0,0,0>]
[1.00 colour rgb <1,1,1>]
}
warp { turbulence 1.0 lambda 2.35 omega 0.75 octaves 9 }
scale 0.55
}
rotate z*-89.999
rotate x*-108
translate <0,9290,0>
}
box { <1000,0,1000>, <-1000,-1,-1000> texture { TestTexture }}
camera { location <0,0.0002,0> look_at <10,0.0002,0> }
light_source { <0,1000,0> colour rgb <1,1,0.95> }
--
Jeff Lee shi### [at] gate net http://www.gate.net/~shipbrk/
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On Wed, 08 Dec 1999 16:18:16 GMT, Jeff Lee wrote:
>I've created a bozo pattern, and after playing around with the various
>turbulence parameters (omega, lambda, and so forth), discovered an odd
>effect.
>
>Namely, at certain points in the pattern, there are very obvious
>parallel bands where the bozo pattern abruptly changes. Why does this
>happen?
It's the translate 9290 that does it. The perlin noise function in POV
doesn't like being evaluated below certain relatively small negative
coordinates.
--
These are my opinions. I do NOT speak for the POV-Team.
The superpatch: http://www2.fwi.com/~parkerr/superpatch/
My other stuff: http://www2.fwi.com/~parkerr/traces.html
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On Wed, 08 Dec 1999 16:18:16 GMT, shi### [at] gatenet (Jeff Lee) wrote:
The noise() function in POV-Ray breaks at -10000 for either x, y, or
z. The fact that you translate 9290 up might make the seam show up in
your scene. Consider a smaller number like 5000, for example.
Peter Popov
pet### [at] usanet
ICQ: 15002700
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