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---%<---%<---
#version 3.5;
global_settings {assumed_gamma 1.0 noise_generator 1}
camera {location <0, 0, -2.0> look_at 0}
plane {
-z, 0
texture {
pigment {
marble
turbulence <0.1,0.1,0>
//octaves 4
colour_map {
[0, rgb 0]
[1, rgb 1]
}
}
finish {ambient 1}
}
}
---%<---%<---
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
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Attachments:
Download 'marble_3_5.jpg' (7 KB)
Download 'marble_3_1.jpg' (3 KB)
Preview of image 'marble_3_5.jpg'
Preview of image 'marble_3_1.jpg'
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For illustrating the other changes too:
http://www.schunter.etc.tu-bs.de/~chris/files/noise_generator_beta6.png
http://www.schunter.etc.tu-bs.de/~chris/files/noise_generator_beta7.png
Also note that with 'gradient x triangle_wave' (which should look
identically) the problem does not occur.
Christoph
--
Christoph Hormann <chr### [at] gmx de>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
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in news:3BE036E1.3DF5C4DB@gmx.de Christoph Hormann wrote:
> http://www.schunter.etc.tu-bs.de/~chris/files/noise_generator_beta7.
> png
When you put the turbulence inside a warp statement, the problem is
gone.
Also try octaves 4, it give a quite nice result actually.
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
Post a reply to this message
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"Christoph Hormann" <chr### [at] gmxde> wrote...
>
> For illustrating the other changes too:
>
> http://www.schunter.etc.tu-bs.de/~chris/files/noise_generator_beta6.png
> http://www.schunter.etc.tu-bs.de/~chris/files/noise_generator_beta7.png
>
> Also note that with 'gradient x triangle_wave' (which should look
> identically) the problem does not occur.
Thanks for this... it is great!
Is f_ridged_mf "correct' with noise 1 or with 2/3? (i.e. does it need to be
re-tweaked for noise 2 & 3)?
-Nathan
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"ingo" <ing### [at] homenl> wrote...
>
> ---%<---%<---
> #version 3.5;
> global_settings {assumed_gamma 1.0 noise_generator 1}
> camera {location <0, 0, -2.0> look_at 0}
>
[clip]
I can't duplicate this problem in my personal compile of 3.5 (which was
compiled from the latest sources)... hopefully it will be gone in the next
beta.
-Nathan
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Nathan Kopp wrote:
>
> Is f_ridged_mf "correct' with noise 1 or with 2/3? (i.e. does it need to be
> re-tweaked for noise 2 & 3)?
>
I think all versions of f_ridged_mf are somewhat wrong, see the following
pictures and histograms:
http://www.schunter.etc.tu-bs.de/~chris/files/RMF_noise1.png
http://www.schunter.etc.tu-bs.de/~chris/files/RMF_noise2.png
http://www.schunter.etc.tu-bs.de/~chris/files/RMF_noise3.png
http://www.schunter.etc.tu-bs.de/~chris/files/RMF_wilbur.png
http://www.schunter.etc.tu-bs.de/~chris/files/RMF_ategeros.png
http://www.schunter.etc.tu-bs.de/~chris/files/hist_noise1.png
http://www.schunter.etc.tu-bs.de/~chris/files/hist_noise2.png
http://www.schunter.etc.tu-bs.de/~chris/files/hist_noise3.png
http://www.schunter.etc.tu-bs.de/~chris/files/hist_wilbur.png
http://www.schunter.etc.tu-bs.de/~chris/files/hist_ategeros.png
RMF parameters are: 0.6, 2.2, 7, 0.7, 0.8
What you can see is that apart from a range problem with all noise
generators, there are small 'hills' in the lowest parts, with ng 1 they
are extremely exaggerated. Such hills can occur with certain parameters,
but they should not with these. See the results from other programs for
comparison.
Christoph
--
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
Post a reply to this message
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"Christoph Hormann" <chr### [at] gmxde> wrote ...
>
>
> RMF parameters are: 0.6, 2.2, 7, 0.7, 0.8
>
> What you can see is that apart from a range problem with all noise
> generators, there are small 'hills' in the lowest parts, with ng 1 they
> are extremely exaggerated. Such hills can occur with certain parameters,
> but they should not with these. See the results from other programs for
> comparison.
This looks like it might be a bug in RMF and not with the noise generators
themselves (well, except for NG1, which is way off).
-Nathan
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Wasn't it Nathan Kopp who wrote:
>Is f_ridged_mf "correct' with noise 1 or with 2/3? (i.e. does it need to be
>re-tweaked for noise 2 & 3)?
It looks to me like f_ridge, f_ridged_mf and f_hetero_mf did just get
tweaked in beta 7. They are a lot more rounded than they were in
previous betas.
--
Mike Williams
Gentleman of Leisure
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"ingo" <ing### [at] homenl> wrote...
>
[clipped]
Fixed for next beta.
-Nathan
Post a reply to this message
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