It’s easy really, all things considered. Say, raytracing the algorithm was first described as a method for drawing computer game graphics back in the 80’s or so. The problem was, for a long time, there was no hardware capable of using that. After a decade or so it was first used in animation movies(think toy story) where each “frame”, raytraced, took hours to complete.
Often the developers start out by making something that no machine is capable of running and then the real work is in trimming it down enough that computers that people have can run it. The real magic is in making the game actually run at good fps.
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