Great work! If you can optimize it you could really go somewhere with this idea! Maybe try caching the results of the lighting calculations so they don't reload, but I don't know how you've coded it so all I can offer is a thought. Nevertheless, incredible!

I keep the myX/myY variables in the actor class, then keep the cameraX/cameraY variable in the world class. I just tell the actors to position themselves according to the getWorld().cameraX/Y.

Ah yes, that makes sense. Although, I've used the tile method before with both negative and positive tileX/Y values and it works out fine, just depends how you saved them.

@EpicAlbino to simplify what Builderboy just said, the idea goes like this: myX is where your actor is really "standing" tileX is where the "camera" is looking from so for the actor, you would just do something like "setLocation(myX + tileX, myY + tileY)"