one word.

BOINGGGGGGGGG!!!!!!!

LOL

Rick

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Peter Popov wrote:
> 
> 
> Ah, so you went ahead and got bouncy after all, didn't you? :)
> 
> Have you tried to make it lose energy upon impact?

You probably have to introduce the energy loss from the springs as well
....

i.e. make something like this:

velocity[point] = velocity[point]*Damping + (.. forces, etc.....)

and use values from .90 to .99 for Damping.

Go to this web page for more info:

http://freespace.virgin.net/hugo.elias/models/m_string.htm

(but you maybe already know it)

Bouf.

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Would have? It is cool.
Ever see the movie Flubber? This could be a toy made out of it.  I think it's a
great start, just need applications for it.

Bob

"John VanSickle" <van### [at] erolscom> wrote in message
news:388D0372.A915605C@erols.com...
| I had the idea of simulating the behavior of a bunch of weights and
| springs all connected together.  I tried one approach to simulating
| this, resulting in the animation attached to this message.  As you
| can see, it starts out OK, but begins to oscillate in an unnatural
| fashion.  I have an idea for a method of cheating away the problem,
| but I'm also working on my next IRTC entry as well.  When results are
| forthcoming I'll post something more useful.
|
| Regards,
| John
| --
| ICQ: 46085459

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I haven't got the smarts to deal with real physics or the imagination
to come up with my own ideas for animations, so I stole your idea...

I gave the beans from my last posting a linear attraction to the origin,
a 1/distance repulsion from each other, and filled the space with a
constant friction factor.  I also added a love of the ground to these
little guys.  The full (5MB) movie is http://members.home.net/spock19

I use a Java program to pre-compute the positions of each point in
each frame and POV to render the frames.  This time I chose to show
each point as a sphere and connected them with cylinders (stealing
from you once again :-)

If you want a copy of my code just ask.  I should warn you it makes
no attempt to implement physics (phony or otherwise), but it seems to
make interesting movies...



"John VanSickle" <van### [at] erolscom> wrote in message
news:388D0372.A915605C@erols.com...
> I had the idea of simulating the behavior of a bunch of weights and
> springs all connected together.  I tried one approach to simulating
> this, resulting in the animation attached to this message.  As you
> can see, it starts out OK, but begins to oscillate in an unnatural
> fashion.  I have an idea for a method of cheating away the problem,
> but I'm also working on my next IRTC entry as well.  When results are
> forthcoming I'll post something more useful.
>
> Regards,
> John
> --
> ICQ: 46085459

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Attachments:
Download 'Spring90.jpg' (21 KB)

Preview of image 'Spring90.jpg'

John VanSickle wrote:

>I had the idea of simulating the behavior of a bunch of weights and
>springs all connected together.  ...

Here the java source of "Struct" and "Fuidiom" is available. Could be a 
source of inspiration.
http://www.fluidiom.com/index.jsp?droplet=droplets/code/droplet.jsp

Ingo

-- 
Photography: http://members.home.nl/ingoogni/
Pov-Ray    : http://members.home.nl/seed7/

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It is cool... and it makes perfect sense. This thing falls and bounces,
stabilizes, then realizing that it's hit the floor, throws a temper tantrum.
My best friends 8 month old daughter does the same thing...

John VanSickle wrote:

> I had the idea of simulating the behavior of a bunch of weights and
> springs all connected together.  I tried one approach to simulating
> this, resulting in the animation attached to this message.  As you
> can see, it starts out OK, but begins to oscillate in an unnatural
> fashion.  I have an idea for a method of cheating away the problem,
> but I'm also working on my next IRTC entry as well.  When results are
> forthcoming I'll post something more useful.
>
> Regards,
> John
> --
> ICQ: 46085459
>
>   ------------------------------------------------------------------------
>                Name: not!.mpg
>    not!.mpg    Type: MPLAYER2 File (video/mpeg)
>            Encoding: base64

--
Josh English
eng### [at] spiritonecom
"May your hopes, dreams, and plans not be destroyed by a few zeros."

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Josh English wrote:
> 
> It is cool... and it makes perfect sense. This thing falls and bounces,
> stabilizes, then realizing that it's hit the floor, throws a temper tantrum.
> My best friends 8 month old daughter does the same thing...

Sounds like you check that out twice a day, just in case things
change...

;-)

Axel

> 
<..>

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John VanSickle wrote:

> I had the idea of simulating the behavior of a bunch of weights and
> springs all connected together.  I tried one approach to simulating
> this, resulting in the animation attached to this message.  As you
> can see, it starts out OK, but begins to oscillate in an unnatural
> fashion.  I have an idea for a method of cheating away the problem,
> but I'm also working on my next IRTC entry as well.  When results are
> forthcoming I'll post something more useful.

    Finite element solutions?

--
"If I am the one, who is the two?" - Neo

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John VanSickle wrote:

> Matt Giwer wrote:
> >
> >     Finite element solutions?
>
> I'm not familiar with the phrase.  Could you elucidate?

    Break down an object into small elements and describe
the nodes (vertices) of each element with the equations
that would locally control their interaction. Smaller the
better but the greater the processing time. Finite element
as it is an approximation to the integral solution where
the variable gets smaller but does not reach infinity,
therefore finite. Used primarily where the complete
solution is too hard or does not exist. Such as locally, in
small elements, relationships can be modeled as linear
where the behavior over the complete surface in non-linear.

    And of course in this animation where a four-body
problem solution is the animation.

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Wah.
I have spent some time turning my flocking algorithm into a beach ball
algorithm, trying to turn my actors into points on the surface of a ball.  I
cannot keep the "ball" from completely collapsing upon hitting the ground...

John VanSickle wrote:

> I had the idea of simulating the behavior of a bunch of weights and
> springs all connected together.  I tried one approach to simulating
> this, resulting in the animation attached to this message.  As you
> can see, it starts out OK, but begins to oscillate in an unnatural
> fashion.  I have an idea for a method of cheating away the problem,
> but I'm also working on my next IRTC entry as well.  When results are
> forthcoming I'll post something more useful.
>
> Regards,
> John
> --
> ICQ: 46085459
>
>   ------------------------------------------------------------------------
>
>                   Name: not!.mpg
>    not!.mpg       Type: MPEG Video (video/mpeg)
>               Encoding: base64

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