I don't understand the effect of the worlds cell size. I tried ( whit to world cell size ) to always center an actor in a cell ( for a board game ) so I didn't had to calculate all the coordinates in multiples of 64. I know all this is fairly easy without a cell size. What I wanted to do that's more difficult without is be able to click on a button and generate an object at the mouses position and when the mouse clicks on the object make it so It doesn't follows the mouse and place it in the center of a cell. this is difficult without because u have to find the nearest multiplier of 32 (to the X and Y) and then check if one of those is a multiplier of 64 and if it is ignore it and find a the second closets. Maby there is an easier way to to do this with to cell size.