This is my first attempt of a simple dynamic environment, in which a sphere
moves and pushes the cloth. It took almost 6 hours to simulate and about 1
hour to render.

I had to use much more stronger forces, because the hanging curtain was
stretching itself too much. Therefore I had also to take much smaller time
steps.

I still have to fix many things... for example, the gravity is too weak...

I hope you like it,

Fernando.

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Attachments:
Download 'newcloth24.m1v.mpg' (468 KB)

That's really impressive. What are you using for your cloth?
thanks,
Dennis

news:3c67202e@news.povray.org...
> This is my first attempt of a simple dynamic environment, in which a
sphere
> moves and pushes the cloth. It took almost 6 hours to simulate and about 1
> hour to render.
>
> I had to use much more stronger forces, because the hanging curtain was
> stretching itself too much. Therefore I had also to take much smaller time
> steps.
>
> I still have to fix many things... for example, the gravity is too weak...
>
> I hope you like it,
>
> Fernando.
>
>
>

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Hi Dennis,

I'm glad you liked it. I'm using a mesh2 object for the cloth.

Thanks,

Fernando.

"Dennis Milller" <dhm### [at] mediaonenet> wrote in message
news:3c67312c$1@news.povray.org...
> That's really impressive. What are you using for your cloth?
> thanks,
> Dennis

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First thing I noticed was the stretching of the curtain, as
it is "strained" by its own weight.

But aside the slow-mo effect of the curtain falling back
in place, it looks very nice and realistic. I hope you'll
release a beta-version for those interested in messing
around with the program. Looks like it could make a
cool plug-in...

--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html

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I like it. The curtain still streches to much. It reminds me somewhat of
very slow lotion movies of bullets hitting oranges. That and the slow
swing back suggests that when playing it at a more realistic speed
it will look almost lifelike.

Have you considered using a different color for the curtain and
replacing the ball with a bull?

    Andrel



> This is my first attempt of a simple dynamic environment, in which a sphere
> moves and pushes the cloth. It took almost 6 hours to simulate and about 1
> hour to render.
>
> I had to use much more stronger forces, because the hanging curtain was
> stretching itself too much. Therefore I had also to take much smaller time
> steps.
>
> I still have to fix many things... for example, the gravity is too weak...
>
> I hope you like it,
>
> Fernando.
>
>                      Name: newcloth24.m1v
>    newcloth24.m1v    Type: WMPLAYER File (video/mpg)
>                  Encoding: x-uuencode

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"andrel linnenbank" <a.c### [at] amcuvanl> wrote in message
news:3C684516.B23C2141@amc.uva.nl...
> I like it. The curtain still streches to much. It reminds me somewhat of

Thanks!!!

> very slow lotion movies of bullets hitting oranges. That and the slow
> swing back suggests that when playing it at a more realistic speed
> it will look almost lifelike.

Yes, even though I transformed it into a 60 fps animation, it wasnt enough
to speed it up to a realistic time-scale. One problem was gravity, I think
it is too strong.

> Have you considered using a different color for the curtain and
> replacing the ball with a bull?

I *think* you meant bullet, because a bull would be much harder to model!!!!
And I think it may not be a very good idea because one would expect that a
bullet would break the fabric, as a sphere would travel more slowly and it
would only push it.
I don't think it's easy to simulate a breaking of the cloth, it's a good
challenge. But maybe it would be cool to try it with Matrix-like shockwaves
forming behind the bullet (which I have already tried).

Thanks for your comments!

Fernando.

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> I don't think it's easy to simulate a breaking
> of the cloth, it's a good challenge.

Idea: when an object exerts a great amount of pressure at a given point,
turn that point into 4 separate points, like along an edge, distribute the
energy from the force of the object through the cloth outwards from the
impact point, and just keep simulating as usual.

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"Tony[B]" <ben### [at] catholicorg> wrote in message
news:3c6942cd@news.povray.org...
> > I don't think it's easy to simulate a breaking
> > of the cloth, it's a good challenge.
>
> Idea: when an object exerts a great amount of pressure at a given point,
> turn that point into 4 separate points, like along an edge, distribute the
> energy from the force of the object through the cloth outwards from the
> impact point, and just keep simulating as usual.

Hi Tony!

I think that's a good idea, however I would have to rewrite large portions
of my code, as my current unfortunate implementation does not allow the
introduction of new points in the fabric.

I also was thinking of having a "flag matrix" where I could indicate which
points have been "broken". I don't know if this idea might work, I have to
think a little bit more about it.

Thanks for your comments,

Fernando.

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