Obtener el NormalMap de un Texture2D en runtime

TextureToNormalmap.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

//Basado en: https://forum.unity.com/threads/bumpmap-grayscale-to-normalmap-rgb.5714/
public class TextureToNormalmap : MonoBehaviour
{
	//---CODIGO DE EJEMPLO------------------------------
	public Texture2D textura;
	[Range(10f, 20f)]
	public float distortion= 10.0f;

	// Use this for initialization
	void Start () {
		Material mat = GetComponent<Renderer> ().material;
		Texture2D Normal = GraytoNormalMap (textura, distortion);
		mat.mainTexture = Normal;
	}

	//---TERMINA CODIGO DE EJEMPLO-----------------------

	//Ayuda a clampear y exagerar el efecto
	float sCurve(float _x, float _distortion = 10.0f)
	{
		return 1f / ( 1f + Mathf.Exp(-Mathf.Lerp(5f,15f,_distortion)*(_x-0.5f)));
	}
	
	Texture2D GraytoNormalMap(Texture2D t, float _distortion)
	{
		Texture2D n = new Texture2D(t.width,t.height,TextureFormat.ARGB32,true);


		for(int y=1;y<t.width-1;y++)
		{
			for(int x=1;x<t.height*2-1;x++)
			{
				float xLeft = t.GetPixel(x-1,y).grayscale;
				float xRight = t.GetPixel(x+1,y).grayscale;
				float yUp = t.GetPixel(x,y-1).grayscale;
				float yDown = t.GetPixel(x,y+1).grayscale;
				float xDelta = ((xLeft-xRight)+1)*.5f;
				float yDelta = ((yUp-yDown)+1)*.5f;
				n.SetPixel(x,y,new Color( Mathf.Clamp01(sCurve(xDelta, distortion)) , Mathf.Clamp01(sCurve(yDelta, distortion)),1f,1.0f));
			}
		}

		n.Apply();
		return n;
	}

	Texture2D NormalmapToGray(Texture2D t)
	{
		Texture2D n = new Texture2D(t.width,t.height,TextureFormat.ARGB32,true);
		Color oldColor = new Color();
		Color newColor = new Color();

		for (int x=0; x<t.width; x++){
			for (int y=0; y<t.height; y++){

				oldColor = t.GetPixel(x,y);
				newColor.r = oldColor.g;
				newColor.b = oldColor.g;
				newColor.g = oldColor.g;
				newColor.a = oldColor.r;
				n.SetPixel(x,y, newColor);
			}
		}

		n.Apply();
		return n;
	}
}