Can I in real time change the vector the gravity is using?
Not currently. You have to do physics sim yourself if you need that.
Box2D is able to do this right? Will this be exposed in the future? 
Because it’s a bit annoying (and not free?) to do it for every object.
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I need this now too for a project. I’d like to change the box2d gravity x,y at runtime.
Would it be possible to get this sooner with a native extension that can interface with existing box2d code?
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