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-Hail
Has anyone fixed or is planning on fixing the grid in noise artifact?
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On Fri, 9 Aug 2002 07:53:08 EDT, "Vampyrium" <nomail@nomail> wrote:
> Has anyone fixed or is planning on fixing the grid in noise artifact?
both not me, but tell us if you plan to do it :-)
ABX
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> Has anyone fixed or is planning on fixing the grid in noise artifact?
May be this paper can help :
http://mrl.nyu.edu/perlin/paper445.pdf
"The original algorithm, although efficient, suffered from two defects: second
order discontinuity across coordinate-aligned integer boundaries, and a
needlessly expensive and somewhat problematic method of computing the
gradient. We (belatedly) remove these defects."
M
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In article <3d53af5d$1@news.povray.org>, "Mael" <mae### [at] hotmail com>
wrote:
> > Has anyone fixed or is planning on fixing the grid in noise artifact?
>
> May be this paper can help :
> http://mrl.nyu.edu/perlin/paper445.pdf
>
> "The original algorithm, although efficient, suffered from two defects: second
> order discontinuity across coordinate-aligned integer boundaries, and a
> needlessly expensive and somewhat problematic method of computing the
> gradient. We (belatedly) remove these defects."
The POV Team knows about this paper. However, I don't think it removes
all the grid artifacts, it just uses a different spline interpolation
that fixes the second derivative discontinuities and has another fix
that makes the noise a little more even, with less "clumping".
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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