Can anyone be kind and tell me whats the deal with Random Seed?? I have never messed with or tried to understand what it does, too busy just playing and learning my first comp. Later!!
I'll quote etj4Eagle on this one"
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A seed is used to generate a random number. Unlike us humans when we want a random number and are playing a board game or the like and roll a dice, the computer can't do this. Instead it uses a mathematical formula to calculate a "random" number. However in order to get a number out the other end you have to give it something to work with. This is where the seed number comes in. The seed is inputted into the function and a new number is then spit out the other end. This random number is then used for whatever the code calls for, but it is also used as the next seed for the random number generator.
Now on setting that first seed, you have to use some semi-random method. Most programs the system clock to provide that initial seed for the random number generator when the program is first loaded. Normally the generator will not be reseeded again while the program is run.
Now Civ3, at least till this next patch, worked a bit different than normal. What it did was every time you saved your game, the value of the current seed was also saved with your game. Hence when you reloaded the game the same sequence of random numbers would always be generated, since the same start value was used for the functions. What this patch does is that it allows the game to not reseed the generator with the saved seed, but to instead continue on with the current sequence when a saved game is loaded.
The actual mechanics of the algorithms used in the random number generators are far beyound me. However, I hope this answers your question.
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Basically it means with 'allow preset seeds' checked (the way it is in older versions), if you reloaded a game, if you moved the same units in the exact same order, you would always get the same results. With that not checked, if you reloaded the game, you might get different results, even if you used the same units in the same order.