[ODE] Springs

[Martin C. Martin]

Hey John,

I think the best test is, will the spring force change significantly in
one time step?  If so, you'd probably be better off with a constraint
(i.e. a joint).  If not, applying a force/torque using simple spring
physics is probably better.

John Butterfield wrote:
> 
> Also can someone clarify for me a bit more about ERP and CFM.  What values
> make them behave which way and what purpose do they serve for ode exactly?

That's answered in the ODE docs.  It even tells you how to convert ERP and
CFM values to spring parameters and back.

- Martin