[ODE] "Negative" gravity for some bodies

[Gaffiere]

Hi,

> It's possible to set a body to behave as been affected by "negative" gravity.
> For example, a gas balloon, that will go up, but interacting with other bodies.
> Thanks!

I think you could try adding a force to the body with dBodyAddForce at
each step of your simulation;

see ya
Thomas

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