diff --git a/lib/torque/renderer/ball.js b/lib/torque/renderer/ball.js
index d3ee511..8e7c798 100644
--- a/lib/torque/renderer/ball.js
+++ b/lib/torque/renderer/ball.js
@@ -175,12 +175,6 @@ BallRenderer.prototype = {
 		var y = (index - 4 * x) / (4 * this.width);
 		return [x,y];
 	},
-	// Clockwise. Again, there definitely is a better way.
-	getNeighbors: function(index){
-		var n = index - this.chWidth;
-		var s = index + this.chWidth;
-		return [n, n + 4, index + 4, s + 4, s, s - 4, index - 4, n -4];
-	},
     isEmpty: function(layer) {
     	for (var i = 0; i<layer.length; i+=4){
     		if(layer[i+3] > 0) return false;
@@ -230,37 +224,21 @@ BallRenderer.prototype = {
 		}
 	},
     isopleth: function(){
-    	var iso = this.createArray();
-    	var contour = this.contourLayer;
-    	var eq = false;
-    	for (var i = 0, len = contour.length; i<len; i+=4){
-			if(!eq){
-	    		var alpha = contour[i + 3];
-	    		if (alpha > 20 && alpha < 255){
-	    			var neighbors = this.getNeighbors(i);
-	    			var refCol = contour[neighbors[0]+3];
-	    			for (var n = 1, ln = neighbors.length; n<ln; ++n){
-	    				if (contour[neighbors[n]+3] !== refCol) break;
-	    				if (n === ln-1) eq = true;
-	    			}
-	    			if(!eq){
-		    			for (var n = 0, ln = neighbors.length; n<ln; ++n){
-		    				var index = neighbors[n];
-		    				if(index>0 && (contour[index+3] === 0 || contour[index+3] !== contour[i+3])){
-		    					iso[index + 3] = contour[i+3];
-		    					iso[index] = 153;
-		    					iso[index + 1] = 60;
-		    					iso[index + 2] = 243;
-		    				}
-		    			}
-		    		}
-		    	}
-    		}
-	    	else{
-	    		eq = false;
+    	if(typeof this.isoplethLayer === 'undefined') this.isoplethLayer = new Uint8Array(this.size * 4);
+    	for (var i = 0, len = this.contourLayer.length; i<len; i+=4){
+    		var alpha = this.contourLayer[i + 3];
+    		if (alpha > 20 && alpha < 255){
+    			var n = i - this.chWidth,
+					s = i + this.chWidth,
+    				neighbors = [n, n + 4, i + 4, s + 4, s, s - 4, i - 4, n -4];
+    			for (var n = 0, ln = neighbors.length; n<ln; ++n){
+    				var index = neighbors[n];
+    				if(index>0 && (this.contourLayer[index+3] === 0 || this.contourLayer[index+3] !== this.contourLayer[i+3])){
+    					this.isoplethLayer[index + 3] = Math.min(this.contourLayer[i+3],255);
+    				}
+    			}
 	    	}
     	}
-    	this.isoplethLayer = iso;
     },
 
     heatmap: function (gradient){