Technically this exists in all games, but it only become apparent/visible in open-world games that get really big and vast. This is known as "floating-point precision", and it exists due to limitations of how numbers are stored in computers. The farther models and objects are from their origin, the less accurate position becomes, and you'll start seeing glitches. Pretty neat and scary at the same time, as it still shows that we have some limitations on what we can do in big games to this day.

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