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I'd like to make my player/enemy sprites etc. global to my .mfa simply so I can easily edit/update them later on. I understand that creating a "clear cache" screen with no objects is a good way to free up memory, will having global objects effect this at all? I think I remember reading Francois say that global objects will stay in the memory even if you have an empty 'clear cache' screen.. can anyone confirm whether this would have a positive or negative impact on my game?
No, global objects are normal objects. We keep a table of the values of the alterable values and other data between frames, but it does not take a lot of memory.
awesome!
I use globals all the time in my iOS apps and have not had any problems with them or memory :)
I use them for the same reason - so I can change the graphics and event behaviours in one frame and have those changes reflected in every other frame. I don't use the alterable values as global so often, but note a common gotcha is as soon as you turn on the global flag for an object, its values will persist across frames, so make sure you put a Start of Frame event in your event behaviour on the object to reset the values to a starting value if that is important to your object & game logic :D