koobas.hobune.stream
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How to exclude int values from Random.Range?
Hey,
I'm trying to have an Enemy move in random directions.
What I've done is set up 8 arrays of ints and for each value from the array I have a movement direction put in place.
My enemy will choose a random direction each time it hits one of the 4 walls (left,right,top,bottom). The problem is that if for the top wall I need for example ints 1,3,5 (which would be the accepted directions), how could I use Random.Range to make it select a value of either 1, 3 or 5 and never 2?
Regards, Eugen
Hey!
I've created an asset designed exactly for that case (it's paid).
https://assetstore.unity.com/packages/tools/input-management/random-exclude-133786
Feel free to try it!
var validChoices = [1,3,5];
function GetRandom() : int
{
return validChoices[Random.Range(0, validChoices.Length)];
}
That's great! $$anonymous$$arking it as an answer, although I'm receiving a Warning: Implicit downcast from 'object' to 'int'. Any way to get around it?
I have to mention that I did not use the code in the exact same way you have provided.
Oh sure just make validChoices:
var validChoices : int[] = [1,3,5];
That's not the cause of the warning. var validChoices = [1,3,5] already returns an int[] array (because it's an array containing only integers); the ": int[]" is superfluous. The code provided does not result in any warnings.
After making defining them as int[] it works perfectly. @Eric, as I mentioned my code was a bit modified.
I think the simplest way is to create a function where you pass the direction that you don't want chosen and it then re-tries the random number if that is chosen.
eg.,
int GetNewDir(int NotThisDirection)
{
int newDir;
newDir = Random.Range(1,8);
while (newDir == NotThisDirection)
{
newDir = Random.Range(1,8);
}
return newDir;
}
Bad practice. In THEORY this while loop can take FOREVER and never randomize the expected numbers.
