like in videogames out of bounds of the map, the void space is infinite? a loop?
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If you don’t add any boundaries, then it depends.
Usually we use floating point values, where the absolute limit is an absolutely huge number, but not infinity. If we use a typical number type, write a 1, followed by 308 zeroes. That’s the sort of number we’re talking about.
The problem is, the further from the centre you go, the more you start to lose precision. When you get to a light-year away from the centre, you can’t represent distances smaller than a metre with any accuracy.
In practice we’ll add a boundary at an arbitrary distance.
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