[Fluxus] physics damping

[Jeff Sandys]

gabor papp said:
> i'm trying to build a tendril object using the physics system. 
> source code is attached. it's built up using a couple of cubes 
> joined together with ball joints, the top is fixed. when i give 
> it a kick, i kick one of the cubes, which makes the whole tendril 
> move. i would like the motion to damp very rapidly. when it gets 
> a kick it moves, but after a second it should stand still again. 
> i can't seem to achieve this. any help would be appreciated
...
>          (set! parts (cons obj parts)))))

I couldn't get this to run, is there an extra close parenthesis 
on the set! statement?

Usually with ODE the way you accomplish damping is by using a 
motor joint.  Each sim loop you query the joint velocity and 
apply a torque in the opposite direction, scalor multiply the 
velocity vector by a (negative) damping constant to create 
the torque vector.  I don't see in the documentation how to 
read the joint velocity in fluxus.

I have used pyODE, check out the AMotor getAngleRate API:
http://pyode.sourceforge.net/api-1.2.0/public/ode.AMotor-class.html

One of my interest in fluxus is to make an animusic like sim:
www.animusic.com/dvd-info-clips-1.html

Thanks, Jeff Sandys

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