[ODE] newbie question: easiest way to create an 'immobile' pendulum

[Jon Watte]

You could connect the pendulum joint to the static environment, and set the swivel position to the center of the top body. Then update the swivel position to the new position of the top body each frame. You still have to work to make the pendulum be the right length each frame, though.

Another way of doing it is to create a heavy, non-gravity body (possibly with a fixed joint to the world) to anchor the pendulum to, and make that body actually follow your moveable top body, using forces.

Cheers,

			/ h+


-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org]On Behalf Of
vincent ngai
Sent: Wednesday, December 15, 2004 11:05 PM
To: ode at q12.org
Subject: [ODE] newbie question: easiest way to create an 'immobile'
pendulum


Hi, what is the easiest way to create an 'immobile' pendulum?
Its not exactly immobile...I want to be able to move the top body by
applying a force, but should a force not be applied to the top body,
the pendulum body swing below it should not be able to move the top.

The way I've thought of is the find the force from the joint acting on
the top body and apply an inverse force thus canceling the movement of
the top body...However
this seems overly complicated for what would be a seemingly trivial task.


Thanks
-- 
Regards,
Vincent
_______________________________________________
ODE mailing list
ODE at q12.org
http://q12.org/mailman/listinfo/ode