koobas.hobune.stream
How to spawn prefabs with percent random?
I need to instantiate 3 different prefabs.
First prefab must spawn with 50 %
Second prefab must spawn with 30 %
Third prefab must spawn with 20 %
I know how to intantite objects, but i didnt know how to make percent random.
Random.value returns a float between 0 to 1. You can use it to generate percentage random like so:
if(Random.value > 0.5) //%50 percent chance
{//code here
}
if(Random.value > 0.2) //%80 percent chance (1 - 0.2 is 0.8)
{ //code here
}
if(Random.value > 0.7) //%30 percent chance (1 - 0.7 is 0.3)
{ //code here
}
what if it returns 0.6, then it would run the first and the second if statement...?
Nope. On each of those if statements a new Random.value is generated. It would work as you've thought only if a variable has been set to be Random.value once, and then re-used in all those if statements.
Sorry for the necroposting here but isn't there a chance that it doesn't instantiate with that code?
I'm using this code for a chance of either having a health potion be dropped, or the player taking damage. Sometimes they both happen, or twice of one or another happen. Is there any way to fix this?
You can also say
if(Random.value <= 0.2)
to get a %20 chance without the confusion.
Wouldn't it be if(0.2 > Random.value)?
for example, say the random value generated a 30%
20% is NOT greater than 30%, therefore the if statement returns false.
however, when the random value generates something like a 15%
20 IS greater than 15, therefore the code will run.
That's the same thing as saying if(Random.value < 0.2) @DigitalCyclone; the <= is just to get the .20 along with all of the other values that are below it.
problem with this is random.value is 0 to 1 [INCLUSIVE] which means that it is possible for the value to be 0, if the chance value was set to 0.0 which means it should never happen since your using <= then there is a slight chance that it could fire.
public float Chance()
{
float[] chances = new float[] { 0.5f, 0.3f, 0.2f }; // Your chances. Summary = 1.0f
float randValue = UnityEngine.Random.value; // Randome value (chance value)
float currentChance = 0f;
float minChanceRange;
float maxChanceRange;
for (int i = 0; i < chances.Length; i++)
{
currentChance += chances[i];
minChanceRange = 0.5f - currentChance / 2;
maxChanceRange = 0.5f + currentChance / 2;
if (randValue >= minChanceRange && randValue <= maxChanceRange)
{
return chances[i]; //code here
}
}
return -1; //This code unreacheble
}
