yade-dev team mailing list archive

[Václav Šmilauer <eu@xxxxxxxx>]

> I will remove displacements and rotations in ForceContainer, and 
> replace them by one-time velocity and angularVelocity: they will be 
> added to state->vel and state->angVel in NewtonIntegrator, but reset 
> by ForceResetter; and they can accumulate, just like forces do.
There is another problem with this approach, which is that those 
transient velocities will be considered only in NewtonIntegrator, but 
not elsewhere (think kineticEnergy, mutual velocity, ...).

The mess comes from the fact that we would like to have a part of 
velocity (in state->vel) that is remembered only as long as an engine is 
active, and then disappears; this is not possible (unless we invent very 
ugly things).

Is someone smart enough to propose a solution that would satisfy the 
following?

1. make state->vel always derivative of state->pos (even if multiple 
translations/rotation/... engines are applied, there are interactions etc)

2. effects of kinematic engines are there only as long as the engines 
are active

3. perhaps something else I forgot...

Cheers, v.