Christoph Hormann wrote:
> Nice.  I already considered adding a macro for such a shape to mechsim.inc
> but i did not have the time yet.  It would probably look better if you
> only display a sphere with large radius at the position of the center
> mass...

Hi Christoph,

The first attempts at this had much lower stiffness, so the ball 
distorted considerably when it bounced. This animation was done close to 
the edge of instability with the highest stiffness I could get away with 
for a reasonable time step.

While I have you on the line (well, sort of :-) could you clarify 
something for me. I originally created the scene with all the object 
sizes ten times bigger. When I reduced the sizes (to give a one meter 
diameter ball) I had to reduce the stiffness as well to get a stable 
system. Is this an expected behaviour, that connection and environmental 
stiffness and damping are size related? Are there any rules-of-thumb 
that can help determine what values will give stable systems at 
different scales? Just curious more than anything, a little 
experimentation gets me reasonable deformations.

Bye for now,
	Mike.

Post a reply to this message