[Solved] unexpected addForce behavior

I'm still new to Ogre, so I may be missing something obvious -

I've got the following callback defined (Python, sorry guys!):

def thrustCallback( self, body ):
body.addForce(body.getVelocity())
bodpos, bodorient = body.getPositionOrientation()
print bodpos, 'vel = ', body.getVelocity(),
if bodpos[0] > bodpos[1]:
body.addForce(bodorient * Ogre.Vector3(-2,0,0))
print ', left'
elif bodpos[0] <= bodpos[1]:
body.addForce(bodorient * Ogre.Vector3(2,0,0))
print ', right'


So the boxes start moving along the x-axis until they reach the point where they're as far along the x-axis as they are on the y-axis, and then should start trying to reverse direction.

This callback is used for a series of boxes set vertically at 0,0,0; 0,1,0; ... 0,7,0. The bottom box moves very little, and the box above it moves out a bit, then bounces back - as expected. But the boxes above move, start to slow down, and continuously print 'left' ... but never reverse direction.

Am I bumping into a damping mechanism of some sort? Or misusing a command? Or did I perhaps just misunderstand a function?

The line


body.addForce(body.getVelocity())


is throwing me for a loop. Have you tried without it?

How big is your newton world? Are you leaving the space?

...wow, that was obvious.

Thanks chuddle, that fixed it! I'd been experimenting with something else and didn't get that line deleted; guess I stopped seeing it.