Downloaded and watched the 1st part of the bunny head tutorial, Projection Mapping & UV Layout, and wondered why he had to move and scale the parts into the 0 to 1 area after he was done. I wondered because the whole time he was tweaking the main head section he had it moved over into an empty space to the left of the grid and it seemed to update fine in the persepctive view.

I've seen plenty of different programs all had to have it in the 0 to 1 area, but just wondered why since it seemed to work fine while he was tweaking. Any simple explanations? I know there has to be one but...

Thanks