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| new:rng_myths [2018/02/19 11:43] – korshun | new:rng_myths [2018/02/19 11:46] – korshun |
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| ====== ZDoom RNG myths ====== | ====== ZDoom RNG myths ====== |
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| Many modders are convinced that ZDoom's [[zdoom>Random]] function is not statistically random, or returns the same sequence of random numbers in different games. As a result, some mods try to enhance the randomness by factoring in [[zdoom>Timer]] or actor positions into their custom RNG, and using it throughout the mod | Many modders are convinced that ZDoom's [[zdoom>Random]] function is not statistically random, or returns the same sequence of random numbers in different games. As a result, some mods try to enhance the randomness by creating a custom RNG that factors in [[zdoom>Timer]] or actor positions, or combines multiple calls to [[zdoom>Random]], and use it throughout the mod. |
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| While this non-randomness of [[zdoom>Random]] was probably true previously, it is not anymore. Zandronum 2.0+ and GZDoom 1.8.6+ (as verified, likely earlier versions too) use high-quality statistically random [[wp>Mersenne Twister]] RNG and don't output the same sequence in different games or rounds. | While this non-randomness of [[zdoom>Random]] was probably true previously, it is not anymore. Zandronum 2.0+ and GZDoom 1.8.6+ (as verified, likely earlier versions too) use high-quality statistically random [[wp>Mersenne Twister]] RNG and don't output the same sequence in different games or rounds. |
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| Therefore, "enhancing" the RNG will only likely make it **less** random in modern versions of source ports. It is recommended to remove any custom RNG code from mods. | Therefore, "enhancing" the RNG will only likely make it **less** random in modern versions of source ports. It is recommended to remove any custom RNG code from mods. |
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| | All ACSUtils functions use plain [[zdoom>Random]]. |
