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Here's the larger image I promised, with a couple of tweaks to the function.
As far as I know, mud like this is usually the result of fine, dusty
material which either washes over a sandy or rocky layer, or is
deposited on it by wind and then hydrated. The sun dries the mud
unevenly, making the top shrink and causing the cracking and
characteristic upward-curling effect.
The point is that if I wanted to get really realistic, I'd have the mud
appear on top of a layer of sand and use radiosity as part of the
lighting solution; shadows from the mud curls and poor sky exposure
would (should) ensure that the cracks were dark enough to provide a
natural contrast.
I tried that, but it's slow, damn slow. "Waiting for 2006" slow.
So, instead, I just used a little ambient for color and added a dark
brown plane for contrast. Unfortunately, the plane ended up clipping
some of the mudcurls, which is why they have those dark spots in the
center that look like little round holes. It also looks weird in the few
spots where there's no mud, but all in all, I'm pleased with the
outcome. It almost looks like a photo, if you happen to catch a passing
glimpse of it in the corner of your eye.
Oh, and to whoever asked before, it turns out that some of the curls
*do* exhibit overhang.
The sphere is a foot in diameter. It was provided for scale, and to add
a little variety.
Right, I'll shut up now. :)
-Xplo
Post a reply to this message
Attachments:
Download 'cracked mud.jpg' (172 KB)
Preview of image 'cracked mud.jpg'
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in povray.binaries.images, Xplo Eristotle says...
> Here's the larger image I promised, with a couple of tweaks to the function.
>
I see only the top part: the rest is not decoded correctly. I see no
sphere...
--
Regards, Sander
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Xplo Eristotle wrote:
>
> Here's the larger image I promised, with a couple of tweaks to the function.
>
> As far as I know, mud like this is usually the result of fine, dusty
> material which either washes over a sandy or rocky layer, or is
> deposited on it by wind and then hydrated. The sun dries the mud
> unevenly, making the top shrink and causing the cracking and
> characteristic upward-curling effect.
>
I think such structures usually occur when muddy water is drying out, like
some flat lake. Such small and regular pieces would probably occur on a
extremely flat ground with very fine material. IMO the curling is also
caused by the finer material concentrating on the surface when the water
is drying out and creating a stronger material that shrinks more than the
layers below.
It looks really good, but I wonder about the small round spots.
>
> The sphere is a foot in diameter. It was provided for scale, and to add
> a little variety.
>
That seems a bit to large to me, such regular cracked mud is quite fine
IMO (2-4 cm structures) larger pieces would involve more roughness and
less curling.
Christoph
--
Christoph Hormann <chr### [at] gmx de>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/
Post a reply to this message
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>
> in povray.binaries.images, Xplo Eristotle says...
> > Here's the larger image I promised, with a couple of tweaks to the function.
> >
> I see only the top part: the rest is not decoded correctly. I see no
> sphere...
>
> --
> Regards, Sander
No problems here. Seems to be progressive JPG.
Karl
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Very interesting effect, it looks convincing, especially the top part (probably
the angle more then the distance).
I wonder how it would look from up close.
Remco
Xplo Eristotle wrote:
>
> Here's the larger image I promised, with a couple of tweaks to the function.
>
> As far as I know, mud like this is usually the result of fine, dusty
> material which either washes over a sandy or rocky layer, or is
> deposited on it by wind and then hydrated. The sun dries the mud
> unevenly, making the top shrink and causing the cracking and
> characteristic upward-curling effect.
>
> The point is that if I wanted to get really realistic, I'd have the mud
> appear on top of a layer of sand and use radiosity as part of the
> lighting solution; shadows from the mud curls and poor sky exposure
> would (should) ensure that the cracks were dark enough to provide a
> natural contrast.
>
> I tried that, but it's slow, damn slow. "Waiting for 2006" slow.
>
> So, instead, I just used a little ambient for color and added a dark
> brown plane for contrast. Unfortunately, the plane ended up clipping
> some of the mudcurls, which is why they have those dark spots in the
> center that look like little round holes. It also looks weird in the few
> spots where there's no mud, but all in all, I'm pleased with the
> outcome. It almost looks like a photo, if you happen to catch a passing
> glimpse of it in the corner of your eye.
>
> Oh, and to whoever asked before, it turns out that some of the curls
> *do* exhibit overhang.
>
> The sphere is a foot in diameter. It was provided for scale, and to add
> a little variety.
>
> Right, I'll shut up now. :)
>
> -Xplo
>
> --------------------------------------------------------------------------------
> [Image]
Post a reply to this message
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Christoph Hormann wrote:
>
> It looks really good, but I wonder about the small round spots.
An oversight on my part. Removing the plane, or altering the function
slightly, would eliminate them.
> > The sphere is a foot in diameter. It was provided for scale, and to add
> > a little variety.
>
> That seems a bit to large to me, such regular cracked mud is quite fine
> IMO (2-4 cm structures) larger pieces would involve more roughness and
> less curling.
I've seen cracked mud this size quite a number of times. I remember
slinging the pieces at things as a young teenager... ^_-
-Xplo
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Remco de Korte wrote:
>
> I wonder how it would look from up close.
Too smooth, I expect. At the moment, there's no provision for extra
roughness in the mud.
It's not really intended to be seen up close. ^^;
-Xplo
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in povray.binaries.images, Karl Pelzer says...
> No problems here. Seems to be progressive JPG.
>
> Karl
>
Indeed, with a proper jpg viewer it is all right.
Nice mud by the way!
--
Regards, Sander
Post a reply to this message
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Xplo Eristotle wrote:
>
> Remco de Korte wrote:
> >
> > I wonder how it would look from up close.
>
> Too smooth, I expect. At the moment, there's no provision for extra
> roughness in the mud.
>
> It's not really intended to be seen up close. ^^;
>
> -Xplo
Okay, I'll try not to fall over...
Remco
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Acceptable. One only needs to improve the texturing. The function is quite
good. Thumbs up!
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