Libgdx's World Units

Question

I\'ve been trying to learn libgdx a little but now i\'m kinda confused about world units there that i don\'t even know what exact question i should be asking.

Anyway

Answer 1

When rendering things using a camera, you should be setting the projection matrix of the sprite batch to the combined view of the camera.

The world is completely separate from the camera. The world has coordinates both positive and negative. The camera is your view of the world, and like a literal camera, it can move around in space. When you move the game camera, you are merely changing what part of the world you can see.

All physics is done on pixel level (in your case) relative to the world origin. It is not changed in any way by the camera.