diff --git a/lib/torque/renderer/ball.js b/lib/torque/renderer/ball.js
index 8c6d739..a46846b 100644
--- a/lib/torque/renderer/ball.js
+++ b/lib/torque/renderer/ball.js
@@ -12,7 +12,7 @@ function BallRenderer(thecanvas){
 	this.size = this.width * this.height;
 	this.pointLayer = new Uint8ClampedArray(this.size * 4);
 	this.radius = 30;
-	this.drawnTemp = [];
+	this.drawnTemp = {};
 	this.prof = 0;
 	this.gradient = {};
 }
@@ -51,19 +51,18 @@ BallRenderer.prototype = {
 		  return Math.sqrt( xs + ys );
 		}
 		// Assumes xi is on the left and xf is on the right
-		var xPointer = xi;
 		if(typeof this.drawnTemp[yi] === "undefined"){
-			while (xPointer <= xf){
-				var alpha = this.map_range(lineDistance(xPointer, yi), 0, this.radius, 30, 0);
-				this.addPoint(xPointer, yi, alpha);
-				xPointer ++;
+			while (xi <= xf){
+				var alpha = this.map_range(lineDistance(xi, yi), 0, this.radius, 30, 0);
+				this.addPoint(xi, yi, alpha);
+				xi ++;
 			}
 			this.drawnTemp[yi]=true;
 		}
 	},
 	contour: function(granularity){
 		var step = 255/granularity;
-		var i = 0, a = new Uint8ClampedArray(granularity+1), c=0;
+		var i = 1, a = new Uint8ClampedArray(granularity+1), c=0;
 		while (i<255){
 			a[c] = i;
 			i += step;