example from class, creating a texture based on SEDAC's Gridded Population of the World data (1 degree resolution)

gpw.js

#pragma strict

private var texture: Texture2D;

function Start() {
	var color;
	var s = new System.IO.File.ReadAllLines('Assets/data/glp00g60.asc');
	var ncols = 360;
	var nrows = 143;
	texture = new Texture2D(ncols,180);
	GetComponent.<Renderer>().material.mainTexture = texture;
	
 	for (var i=0; (i < nrows); i++)
        {
        var vals = s[i+6].Split(" "[0]);
        for (var j=0; (j < ncols); j++)
        	{
	        var pop = parseFloat(vals[j]);
	        if (pop > 1000)
	        	color = Color.white;
	        else if (pop > 0)
	        	color = Color.gray;
			else
				color = Color.black;
			texture.SetPixel(j,nrows-1 - i + 32,color);	        	
	        }
        }

	texture.Apply();
}

function Update () {
}