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As programmer i find many solutions that generates pseudo-random values and surfaces, i'm always wondering how they can do that from a mathematical viewpoint.

For example i can generate a terrain from algorithms, i can input some parameters like the bottom and maximum height of the terrain and a seed to get the terrain that i want; i can't understand that from a mathematical viewpoint, if someone would explain this to me it would be great.

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    what is a seed?2012-09-12
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    the number that you can use to rebuild and obtain the same placement in space, for example if say that the seed is 459593 and input this number you should be able to generate the same map as everybody else that are using this number. It's a "mathematical root" in some ways that parametrize everything.2012-09-12
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    what is a terrain?2012-09-12

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