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OK, first person to figure out *what on earth* I've got POV-Ray to
render here will get... uh... my respect. ;-)
Took just under 4 hours.
The image appears... noisy. I'm really not sure why...
Post a reply to this message
Attachments:
Download 'chaos1451.png' (109 KB)
Preview of image 'chaos1451.png'
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Orchid XP v2 wrote:
> OK, first person to figure out *what on earth* I've got POV-Ray to
> render here will get... uh... my respect. ;-)
>
At least not something modeled after real life.
You have reds, greens and blues, but yellows, purple, cyan and
other mixed colors are absent. It could be some function defined
on the complex plane, yet I would not rule out quaternions.
> Took just under 4 hours.
>
> The image appears... noisy. I'm really not sure why...
can't help you there, I don't know what you did.
>
> ------------------------------------------------------------------------
>
Post a reply to this message
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>> OK, first person to figure out *what on earth* I've got POV-Ray to
>> render here will get... uh... my respect. ;-)
>>
> At least not something modeled after real life.
That's the irony of it... It *is* based on real life. (Although
admittedly not the laws of optics - which is why it doesn't *look* like
anything.)
All will be revealed... in a while.
> You have reds, greens and blues, but yellows, purple, cyan and
> other mixed colors are absent. It could be some function defined
> on the complex plane, yet I would not rule out quaternions.
>
>> Took just under 4 hours.
>>
>> The image appears... noisy. I'm really not sure why...
>
> can't help you there, I don't know what you did.
There are two possible sources for the noise.
This image is a huge grid of different coloured boxes. Each box object
is *supposed* to cover exactly 2 pixels. But if the box grid isn't quite
lined up with the pixel grid (e.g., the camera coordinates are wrong)
that might make it look noisy.
The other possibility is rounding errors. The image is iteratively
generated, so such errors would presumably collect quite quickly...
Post a reply to this message
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> Took just under 4 hours.
Uh, yeah... that's because it's actually the final frame of an
animation. See povray.binaries.animations for a much better idea of
what's going on. (If you can see through all the MPEG distortion!)
This is one of those animations where for each frame, you read in a
bunch of stuff, process it, draw it, and write the new data back to disk
for the next frame. I wonder if I'm loosing precition in the process,
and if that's why it's noisy...
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Since everybody is so captivated by this [not!], I'm going to just come
out with it now.
You remember the chaos pendulum? A metal weight suspended over three
magnets. A while back I make a simulation of its path.
Well, this is 102,400 chaos pendulums, all running in parallel, but each
one started from a different initial pixel location. And each pixel is
coloured according to how close its pendulum currently is to each of the
three magnets. (The magnets are red, green and blue.) If you watch the
animation, it appears to "pulsate" due to the typical swing period of
the pendulum.
In this simulation, there is no gravity, no dissapation, and the magnets
produce linear forces. I plan to try quadratic forces next, and maybe
add some gravity. I'm expecting to find quadratic force makes the
patterns a lot more complex...
BTW, I have done animations with other colourings. Best of all was a
sky-like agate pattern that morphs to the swing. But it keeps crashing
POV-Ray. :'{
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Very interesting that you use POV-Ray for research, so it looks really
useful. Very nice graphics to represent your data.
Orchid XP v2 <voi### [at] dev null> wrote:
> Well, this is 102,400 chaos pendulums, all running in parallel, but each
> one started from a different initial pixel location. And each pixel is
> coloured according to how close its pendulum currently is to each of the
> three magnets. (The magnets are red, green and blue.) If you watch the
> animation, it appears to "pulsate" due to the typical swing period of
> the pendulum.
>
> In this simulation, there is no gravity, no dissapation, and the magnets
> produce linear forces. I plan to try quadratic forces next, and maybe
> add some gravity. I'm expecting to find quadratic force makes the
> patterns a lot more complex...
Post a reply to this message
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Orchid XP v2 spake:
> Since everybody is so captivated by this [not!], I'm going to just come
> out with it now.
>
> You remember the chaos pendulum? A metal weight suspended over three
> magnets. A while back I make a simulation of its path.
>
> Well, this is 102,400 chaos pendulums, all running in parallel, but each
> one started from a different initial pixel location. And each pixel is
> coloured according to how close its pendulum currently is to each of the
> three magnets. (The magnets are red, green and blue.) If you watch the
> animation, it appears to "pulsate" due to the typical swing period of
> the pendulum.
>
> In this simulation, there is no gravity, no dissapation, and the magnets
> produce linear forces. I plan to try quadratic forces next, and maybe
> add some gravity. I'm expecting to find quadratic force makes the
> patterns a lot more complex...
>
> BTW, I have done animations with other colourings. Best of all was a
> sky-like agate pattern that morphs to the swing. But it keeps crashing
> POV-Ray. :'{
Ouch - no wonder I was totally wrong. Never heard of a chaos pendulum - some
kind of classical experiment or device in physics?
--
Stefan Viljoen
Software Support Technician / Programmer
Polar Design Solutions
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> Ouch - no wonder I was totally wrong. Never heard of a chaos pendulum - some
> kind of classical experiment or device in physics?
Like I said, a pendulum with a magnetic weight, with three magnets
placed near to the swing path. You can find them in places like the
Discovery story and the Gadget shop - along with Netwon's Cradle and
other such amusements...
Post a reply to this message
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Orchid XP v2 spake:
>> Ouch - no wonder I was totally wrong. Never heard of a chaos pendulum -
>> some kind of classical experiment or device in physics?
>
> Like I said, a pendulum with a magnetic weight, with three magnets
> placed near to the swing path. You can find them in places like the
> Discovery story and the Gadget shop - along with Netwon's Cradle and
> other such amusements...
Hmm... what's that "plasma ball" thing called? You know, the one with the
glass sphere, filled with some gas (no idea what) and when you place your
hands on it it seems to "flow" in your direction, looking like lightning is
going on inside it? Some kinda flourescent gas.
--
Stefan Viljoen
Software Support Technician / Programmer
Polar Design Solutions
Post a reply to this message
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> Hmm... what's that "plasma ball" thing called?
That would be: a plasma ball.
--
Now as he walked by the sea of Galilee, he saw Simon and Andrew his
brother casting a spam into the net: for they were phishers. And Jesus
said unto them, Come ye after me, and I will make you to become phishers
of men. And straightway they forsook their nets, and followed him.
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