Deterministic random manager, where you can dump into your code a random array (to freeze it), with also the option to have it neutral (average=median value).

CG_RandomManager.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
/*
Deterministic random manager, where you can dump into your code a random array (to freeze it), 
with also the option to have it neutral (average=median value).
*/

public class RandomSequence
{	//Auxiliary function to dump into code a random sequence, to freeze it, control it.

	public int maximumCapacity;
	public bool isNeutral;

	internal bool isEven;
	internal float medianValue;

	internal float[] data;
	
	public RandomSequence(int _Size, float _Min=-1.0f , float _Max=1.0f ,bool _Neutral=true)
	{
		this.isNeutral = _Neutral;

		this.maximumCapacity = _Size;
		this.medianValue = (_Min + (_Max-_Min)*0.5f);
		this.isEven = (this.maximumCapacity %2) == 0 ;
		data = new float[this.maximumCapacity];

		if(_Neutral)
		{
			int midIndex;

			//Debug.Log("midIndex for"+ this.maximumCapacity+" is ="+midIndex);
			if(this.isEven)
				midIndex = Mathf.RoundToInt( this.maximumCapacity*0.5f );
			else
				midIndex = Mathf.RoundToInt( (this.maximumCapacity-1)*0.5f );

			//midIndex --;	//in Odd number, RoundToInt returns allways the even one. 11/2 => 6   13/2 => 6

			List<float> RandBuffer = new List<float>();
			for (int i = 0; i < midIndex ; i++) 
			{
				data[i] = UnityEngine.Random.Range(_Min,_Max);
				RandBuffer.Add( data[i] );
			}

			if( ! isEven)
			{
				data[midIndex] = medianValue;
				midIndex ++;
			}

			for (int i = midIndex; i < this.maximumCapacity ; i++) 
			{
				data[i] = RandBuffer[ UnityEngine.Random.Range(0,RandBuffer.Count) ] ;
				RandBuffer.Remove( data[i] );
				data[i] *= -1;
			}

			if( RandBuffer.Count>0)
				Debug.LogWarning ( "There is still ("+RandBuffer.Count+") random values in data mirror." );
		}
		else
		{
			for (int i = 0; i < this.maximumCapacity; i++) 
				data[i] = UnityEngine.Random.Range(_Min,_Max);


		}
	}





	override public string ToString()
	{
		//string FormattedBuffer ="float[] data = new float["+maximumCapacity+"] {";
		string FormattedBuffer ="new float["+maximumCapacity+"] {";

		for (int i = 0; i < maximumCapacity; i++) 
		{
			if(data[i].ToString().Length>5 )
				FormattedBuffer += data[i].ToString().Substring(0,5) + "f," ;	//let's keep 3 digits only.
			else
				FormattedBuffer += data[i].ToString() + "f," ;
		}
		return FormattedBuffer+"};";
	}
}

#region UnitaryTest


public static class RandomSequence_UnitaryTest
{

	public static bool doIt()
	{

		//RandomSequence rs = new  RandomSequence (512, -1.0f, 1.0f,  true);
		RandomSequence rs = new  RandomSequence (6, -1.0f, 1.0f,  true);
		Debug.Log (rs.ToString ());
		Debug.Log ( checkNeutrality(rs) );

		rs = new  RandomSequence (512, -1.0f, 1.0f,  true);
		Debug.Log (rs.ToString ());
		Debug.Log ( checkNeutrality(rs) );

		rs = new  RandomSequence (11, -1.0f, 1.0f,  true);
		Debug.Log (rs.ToString ());
		Debug.Log ( checkNeutrality(rs) );

		rs = new  RandomSequence (13, -1.0f, 1.0f,  true);
		Debug.Log (rs.ToString ());
		Debug.Log ( checkNeutrality(rs) );

		rs = new  RandomSequence (101, 1.0f, 3.0f,  true);
		Debug.Log (rs.ToString ());
		Debug.Log ( checkNeutrality(rs) );

		rs = new  RandomSequence (101, 1.0f, 3.0f,  false);
		Debug.Log (rs.ToString ());
		Debug.Log ( checkNeutrality(rs) );

		return true;
	}

	public static bool checkNeutrality( RandomSequence _current)
	{
		float sum = 0;
		for (int i = 0; i < _current.data.Length; i++)
			sum += _current.data[i];
		Debug.Log ("Sum is "+sum);

		if (_current.isNeutral) 
		{
			//if (sum - _current.medianValue < Mathf.Epsilon)
			if (sum - _current.medianValue < 0.00001f)  //let's tolerate approximations...
				return true;
			else
				return false;
		}
		else
			return true;

	}

}


#endregion