I'm trying some of the cloth examples, but I thought I'd post a note and see
if anyone has tried simulating 'foil' or metal sheets with the various cloth
programs.

At first I was thinking of a piece of cloth with no gravity, but it SHOULD
drop, it just shouldn't deform when it does drop.

I haven't seen a 'stiffness' parameter in MegaPOV yet, I'm looking at other
cloth patches.

What I"m trying to simulate is a cannon ball shot through a 'door' that is a
piece of metal.  I can live without 'tearing', all I want is the door to
basically move out of the way and then stop, as if pushed aside.  (well,
it's not a cannonball and it's moving a little slower, think of an imovable
force meets a moveable object).

Any advice?

        == John ==

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The regular spring-model of cloth that most programs use will probably fail
doing what you want. The material will have to be "stubborn" to change form.
However, I think it's fairly easy to change the mathematical model of the
cloth to get this working. I think it's very good for getting bumps in cars
and thin metal plates/sheets.

<rant>
Breaking glass, shredding cloth and other things will require breaking up
connections/springs when they stretch too far for too long. We'll need to
take time into account here because probably there are many peaks of pulling
force during the simulation, especially when the 'regular' first order
methods are doing the mathematics. Using Runge-Kutta will make the model
much more stable and this probably results in a much more gentle behaviour
of the particles and the springs.

</rant>

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