What is the formulas about damping in bullet?

[qingteng]

Hi, I am new here. Now I want to understand the damping in bullet. I think the damping is applied in following lines:
m_linearVelocity *= btPow(btScalar(1)-m_linearDamping, timeStep);
m_angularVelocity *= btPow(btScalar(1)-m_angularDamping, timeStep);

the relationship should be;
velocity_n+1 = velocity_n * (1-damping) ^ interval_time
the interval_time should be 1/60 s

My question is: what is the formulas about damping in details? Where can I find the references about damping in bullet?

[Erwin Coumans]

See the discussion here:

http://code.google.com/p/bullet/issues/detail?id=74
Thanks,
Erwin

[qingteng]

Many thanks. However, where can I find the physical formula of damping in Bullet?

See the discussion here:

http://code.google.com/p/bullet/issues/detail?id=74
Thanks,
Erwin

[sparkprime]

My question is: what is the formulas about damping in details? Where can I find the references about damping in bullet?

It is just a factor lost per second. It's not based on any physical theory as far as I know, it's just a model that has the right kind of curve. Since realistic damping is out of the question, the best alternative is a model that is easy to understand.