In general, the world whose act method, or whose actor's act methods, are being executed would be the active, or currently shown, world. If this is just a general question, then fine. If not, then more context is needed here -- explain exactly, in detail, what your issue is. And as usual, show some attempted codes with general scope to further illustrate what you are trying to do.

This is more of a general question, but I'm working on a raycast class. All its methods are static, but right now you somehow got to input the world in which to make the raycast in, for example by entering it directly or by inputing an actor and his world is being used. It would be very helpful to just enter a x and y coordinate and the raycast is done in the world that is currently running.

I don't quite understand the question, but if you need to pass some data to some world you can do it like this: World w=new World(); w.x=x; w.y=y; ...

Thanks that’s great!

That’s not quite what I was trying to achieve, I wanted to get the world that is currently being shown