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How can I program hourglass behavior (similar like on picture) for my game?
Should I make something like gravitation and process each grain of sand?
What about digital hourglass (like on this clocks)?
Tangentially, you can model falling sand with cellular automata. I’d not considered using it for an hourglass simulation, but in principle it might work quite nicely, and be a fun project.
Looking at your digital hourglass — either the grains move in set patterns, or it might use something like this CA.