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"J. Diehl" <j.d### [at] firemail de> wrote in
news:web.3d75e7cda31ba4aaf70c33440@news.povray.org:
>
>
> //my suggestion (with clock 0-1)
I'll give that a try in a moment!!!
Thank you very much indeed!
Thomas
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"J. Diehl" <j.d### [at] firemailde> wrote in
news:web.3d75e7cda31ba4aaf70c33440@news.povray.org:
>
>
> //my suggestion (with clock 0-1)
>
I just rendered it here at work and it looks great! Now all I need to do is
to find sometime and implement it....
Thomas
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hmmmm This would go nicely into povray.text.scene-files group.
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Thomas van der Veen wrote:
>I just rendered it here at work and it looks great! Now all I need to do is
>to find sometime and implement it....
I'm pleased I could help. And thanks for the idea with Lego models - I'm
just starting with them and experimenting a little. But rebuilding your
truck would take me years... aaargh! Pieces never rest where I want to...!
'Nice' sculptures, though, look a bit like modern art or fractals or...
:-)))
Playing with LeoCAD and exporting to POV, I figured out that the coordinate
system is very different to mine (I'm not the first, I guess). But with
putting the parts into a union and do some rotate <-90,180,0> and scale
1.25 on it, it fits with my coordinates (x=left-right, y=up-down,
z=back-forward, 1 POV unit = 1 brick unit).
You'll have to find some translations for your parts, too. I think it's much
easier than trying to translate my script into any LeoCAD or LDraw
coordinate system.
have a nice time
jo
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hughes, b. wrote:
>hmmmm This would go nicely into povray.text.scene-files group.
>
At the time, this model is beeing tested and modified in any thinkable way,
and we're discussing rather ideas than scripts here.
Looking at the complete scene I posted above - right, that could have been
done in scene-files, too (and animations!?). So I'll post it there when
everything is done and wheels are rotating... be patient.
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I just posted an animation in the animations group. Enjoy!
Thomas
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"Thomas" <tho### [at] gmxnet> schrieb
> How does a trailer follow the car/truck that is pulling it through bends, is
> there some magic formula for it? All I can figure out is that the angle
> between the two is related to the length of the trailer but beyond that I'm
> a bit lost.
I don't know if the "mathematical correct" answer has already been given
(or if you have come to a solution in another way), the term for the curve
that the trailer describes following the truck (or a dog following the leash
and so on) is called "tractrix". It is a simple solution of a simple differantial
equation.
Guckst Du hier:
http://mathworld.wolfram.com/Tractrix.html
HTH
Markus
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>I don't know if the "mathematical correct" answer has already been given
>(or if you have come to a solution in another way), the term for the curve
>that the trailer describes following the truck (or a dog following the leash
>and so on) is called "tractrix". It is a simple solution of a simple differantial
>equation.
>
>Guckst Du hier:
>
>http://mathworld.wolfram.com/Tractrix.html
>
>HTH
>
>Markus
>
Thanks for the the term of the curve. Yes, the problem (and its solution) is
quite simple, but putting it into an algorithm with pov models to move is a
little more than just solving a differential equation.
I tried it with a dog yesterday, but he didn't follow the curve. Charlie was
running three times around a tree and a garden chair, although I showed him
the equations before! Any solution for this problem? ;-)
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In article <web.3d81b338a31ba4aaf70c33440@news.povray.org>,
"J. Diehl" <j.d### [at] firemailde> wrote:
> I tried it with a dog yesterday, but he didn't follow the curve. Charlie was
> running three times around a tree and a garden chair, although I showed him
> the equations before! Any solution for this problem? ;-)
It was misworded...*you* follow the curve, the dog goes where he wants.
;-)
--
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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> I tried it with a dog yesterday, but he didn't follow the curve. Charlie was
> running three times around a tree and a garden chair, although I showed him
> the equations before! Any solution for this problem? ;-)
Pull harder! Or get a different dog. ;-)
Markus
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