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What implementation of Perlin noise does Povray use?
Docs say noise_generator type 3 is Perlin noise...
I'm asking because I stumbled on paper by Perlin (SIGGRAPH 2002 p.681),
describing some ameliorations to the noise algorithm and I was wondering if
these has found their way in Pov code.
Anyone interested, mail me to get a pdf of the paper.
-- Alex
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Alex wrote:
> What implementation of Perlin noise does Povray use?
> Docs say noise_generator type 3 is Perlin noise...
> I'm asking because I stumbled on paper by Perlin (SIGGRAPH 2002 p.681),
> describing some ameliorations to the noise algorithm and I was wondering if
> these has found their way in Pov code.
The POV feature was implemented before that paper and uses the old
algorithm, but the POV Team is aware of the improved version.
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In article <web.3dea1a294f6241ac15e7f0160@news.povray.org> , "Alex"
<ale### [at] alphac it> wrote:
> What implementation of Perlin noise does Povray use?
Check the source code for details. there have also been discussions about
the noise functions, iirc in the povray.beta-test group.
> Docs say noise_generator type 3 is Perlin noise...
> I'm asking because I stumbled on paper by Perlin (SIGGRAPH 2002 p.681),
We know about the paper and have it, yes.
> describing some ameliorations to the noise algorithm and I was wondering if
> these has found their way in Pov code.
Well, the release date of POV-Ray 3.5 should give you a very clear
indication about this...
Thorsten
____________________________________________________
Thorsten Froehlich
e-mail: mac### [at] povrayorg
I am a member of the POV-Ray Team.
Visit POV-Ray on the web: http://mac.povray.org
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> I'm asking because I stumbled on paper by Perlin (SIGGRAPH 2002 p.681),
> describing some ameliorations to the noise algorithm and I was wondering
if
> these has found their way in Pov code.
If you're talking about what I think you're talking about, I've implemented
one of the two improvements mentioned in that paper in Slime-POV
(http://www.slimeland.com/slimepov/). I didn't implement the gradient
changes because I didn't really understand them very well.
Keep in mind that Slime-POV has a couple significant bugs... I've fixed them
(I think) but haven't uploaded a new version yet. I've been doing other
things.
- Slime
[ http://www.slimeland.com/ ]
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>Check the source code for details. there have also been discussions about
>the noise functions, iirc in the povray.beta-test group.
>
>We know about the paper and have it, yes.
I didn't mean to imply that the POV Team wasn't paying attention to the rest
of world.
I just remembered a thread about noise discontinuities during beta-test and
I thought: "This is the same problem...Hmmm...send a note to the POV
groups, just in case."
>
>Well, the release date of POV-Ray 3.5 should give you a very clear
>indication about this...
>
The paper has been circulating in various pre-publication state since some
months...
cya
Alex
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