A boolean, written for use in Unity3D, that evaluates to true pseudo-randomly. Given a *baseProbability* from 0 to 1, it follows a Pseudo-Random Distribution inspired by http://wiki.teamliquid.net/dota2/Pseudo_Random_Distribution Every time it evaluates false, it increases the probability to evaluate true.

PseudoRandomBoolean.cs

using UnityEngine;
using System;

/**
 * Source at https://gist.github.com/Fonserbc/d061905a48555e583edc
 * Made by @fonserbc
 * Inspired by Valve's PRNG in use in Dota 2
 */
public class PseudoRandomBoolean {
	
	float _baseProbability;
	float _currentProbability;
	int iteration;

	public float baseProbability {
		get {
			return _baseProbability;
		}
		set {
			_baseProbability = value;
			Reset();
		}
	}


	public PseudoRandomBoolean () {	}

	public PseudoRandomBoolean (float probability) {
		baseProbability = probability;
	}


	public static implicit operator bool (PseudoRandomBoolean b) {
		if (UnityEngine.Random.Range(0f, 1f) < b._currentProbability) {
			b.Reset ();
			return true;
		}
		else {
			b._currentProbability += (1f - b._currentProbability)*b._baseProbability;
			b.iteration ++;
			return false;
		}
	}

	public float GetCurrentProbability() {
		return _currentProbability;
	}

	public void Reset() {
		_currentProbability = _baseProbability;
		iteration = 0;
	}

	public int GetIterationCount() {
		return iteration;
	}
}