This works by simply checking if the Random Value is more than 0.5, to create a 50/50 probability, setting the boolean to true if it is or false if it’s not.īy manually setting the starting Seed value to 1234, I can produce the same random numbers over and over again. Instead, if it’s more likely that a number will be repeated, making multiple attempts to pick a new value can avoid repetition.įor(int i=0 randomNumber = lastNumber & i 0.5 However… if there’s a high chance that the same number could be picked twice in a row, because you’re picking from a small range, for example, one check may not be enough to reliably avoid repeated results. Most of the time, checking once and picking again if the value is the same will be enough to avoid repeated random results. Typically, it involves storing the last value that was picked and simply picking again if it’s chosen twice in a row. There are lots of reasons you might want to do this but, generally speaking, it’s useful for avoiding repetition when you’re trying to create variation. There may be times when generating a random number that you’d like to avoid picking the same number twice in a row. However, at other times it can be helpful, such as when getting a random Array element, as it would allow you to use the Array’s Length property as an upper limit (even though the highest index would be one lower) without overshooting. This can be inconvenient in some cases, as you may need to specify a range that’s 1 number higher than what you actually want. It’s exclusive, meaning that passing in 0 and 10, when using integers, could return any value from 0 to 9, but not 10. However, when getting a random integer, while the minimum value is inclusive, just like with the float, the maximum is not. However, what Unity considers to be the upper limit of the random range will be different depending on if you’re getting a float or an integer.įor example, when getting a random float, the minimum and maximum values you pass in are inclusive of the range, meaning that, if you pass in 0 and 10, you could get 0 or 10 back, as well as everything in between. This works even if the target value is a float, because the random number that is returned is a whole number, an integer.īoth of the overload methods of the Random Range function work in the same way, by accepting minimum and maximum values to return a random float or a random integer between two numbers. Like this: float randomNumber = Random.Range(0, 100) So, for example, to generate a random integer, simply pass in whole numbers when using the Random Range function. The Random Range function is available in two versions, which will return either a random float value or a random integer, depending on the type of values that are passed into it. Like this: // returns a random number between 0 and 10įloat randomNumber = Random.Range(0, 10) To create a single random number using the Random Range function, simply pass in the minimum and maximum values that you want to use.
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Here’s how it works… How to use Random Range in Unity Generating a random number in Unity is, generally, very straightforward.įor most uses, the Random Range function, which returns a random value between two numbers, will be all you need to use. Picking a random item from a List in Unity.How can you recreate predictable results, using random data?īut don’t worry, because in this article I’ll show you everything you need to know to get started with random values in Unity and how you can use them to add variation to different parts of your game. Maybe you want to create weighted probability, so that enemies drop rare loot less often than they drop common rewards.Īnd what if you’re using random values to generate objects and worlds. While generating a random number in Unity can be very straightforward, actually randomizing different parts of your game can be more complex.įor example, perhaps you want to place an object at a random position. Which is useful, because in many games, random numbers are extremely important for creating varied gameplay and behaviours.
Generating a random value in Unity can be very simple.
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