I think the animation you posted was too small to really appreciat it. I
downloaded the higher quality DIVX animation and I must say I liked it a
lot.
You're right about the trembling... I think it would be great if you could
be able to implement a better algorithm instead of Forward Euler. I didn't
have luck in that attempt, but I hope you will succeed.
Congratulations!
Fernando.
"Apache" <apa### [at] yahoo com> wrote in message
news:3c61d8f1@news.povray.org...
> This is just another cloth animation... my apologies :-)
>
> I lowered the stiffness to a minimum of 1. This rubber sheet consists of
> 150x150 atoms (149x149x2 triangles). The total atom-atom spring amount is
> 221710. I put three spheres in the scene, since I haven't found the time
to
> work more on the system today. The higher quality animations are available
> at http://geitenkaas.dns2go.com/experiments/. (Cloth06test3)
>
> As you can see in the higher quality animations the sheet is trembling a
> bit. This is caused by the inherent instability of the forward-Euler
> algorithm that my system uses.
> There are a few different ways to minimize this instability:
> 1. Smaller timesteps (now: 0.0001)--> more steps needed per animation
frame
> (now: 80).
> 2. More force dampening (now: 0.997). Each timestep the velocities of the
> atoms are multiplied by a value to simulate energy loss (by internal
> friction). The lower the DAMPING value, the more stable the system becomes
> and the less interesting the movements become.
> 3. Using another algorithm instead of Forward-Euler like Inherent Euler
or
> Leap-Frog.
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