27 June 2011 20:30
The life of a Games Programmer: Collision detection...
(via)Lemmings never did full sprite to background collision checking, in fact all it did was test a pixel at the feet of a lemming, into the mask. And you could do that directly in GML if you wanted to! In fact, Lemmings had a "1600x160" play area, and you could easily convert this to a 200x160 "BIT" per-pixel mask.
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