[ODE] Mushy Density?

Jon Watte (ODE) hplus-ode at mindcontrol.org
Tue Jun 12 00:33:38 MST 2007

Density has nothing to do with mushiness. Think of mercury or lead -- 
very dense, very mushy.

ODE models mushiness using CFM and ERP. Make the ERP high (0.9 or 
higher), and make the CFM very small (1e-4 or lower) for nice, crisp 
contacts. However, you'll need a smaller time step to make this work, 
and at some point, you really won't make it work in floating point at 
all, but should instead move over to double precision.


          / h+

Chris Spencer wrote:
> I've noticed that as the mass of objects increase, they tend to become
> more "mushy" in the sense that colliding objects will penetrate each
> other quite severely, even if both objects have very high densities.
> Is there any way to counteract this effect while still using large
> units?
> Regards,
> Chris
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