Adding a new impostor for the impostor tracking. This will be done by the impostor itself.
the impostor to add
Called by the scene. no need to call it.
Get the time step of the physics engine.
Remove an impostor from the engine. This impostor and its mesh will not longer be updated by the physics engine.
the impostor to remove
Set the time step of the physics engine. default is 1/60. To slow it down, enter 1/600 for example. To speed it up, 1/30
the new timestep to apply to this world.
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