diff --git a/lib/torque/renderer/iso.js b/lib/torque/renderer/iso.js
index aeeabb2..d8b7fb7 100644
--- a/lib/torque/renderer/iso.js
+++ b/lib/torque/renderer/iso.js
@@ -135,7 +135,7 @@ torque.extend(IsoRenderer.prototype, torque.Event, {
 		else if (type === 1 || type === 14){
 			next = [S,W];
 			interpolation = {
-				x: this._lerp(cornerValues[2], cornerValues[3], contourValue), 
+				x: 1-this._lerp(cornerValues[2], cornerValues[3], contourValue), 
 				y: this._lerp(cornerValues[0], cornerValues[3], contourValue)
 			};	
 		} 
@@ -157,7 +157,7 @@ torque.extend(IsoRenderer.prototype, torque.Event, {
 			next = [N,E];
 			interpolation = {
 				x: this._lerp(cornerValues[0], cornerValues[1], contourValue), 
-				y: this._lerp(cornerValues[2], cornerValues[1], contourValue)
+				y: 1 - this._lerp(cornerValues[2], cornerValues[1], contourValue)
 			};	
 		} 
 		else if (type === 6 || type === 9) {
@@ -170,21 +170,48 @@ torque.extend(IsoRenderer.prototype, torque.Event, {
 		else if (type === 7 || type === 8) {
 			next = [N,W];
 			interpolation = {
-				x: this._lerp(cornerValues[1], cornerValues[0], contourValue), 
-				y: this._lerp(cornerValues[3], cornerValues[0], contourValue)
+				x: 1-this._lerp(cornerValues[1], cornerValues[0], contourValue), 
+				y: 1-this._lerp(cornerValues[3], cornerValues[0], contourValue)
 			};	
 		} 
 		else if (type === 5 || type === 10) {
-			if (!previousPos) return;
 			var diff = [previousPos.x - currentPos.x, previousPos.y - currentPos.y];
 			if (diff[0] === -1){
-				return {x: currentPos.x, y: currentPos.y - 1};
+				return {
+					x: currentPos.x, 
+					y: currentPos.y - 1,
+					interpolation: {
+						x: 1 - this._lerp(cornerValues[1], cornerValues[0], contourValue), 
+						y: 1 - this._lerp(cornerValues[3], cornerValues[0], contourValue)
+					}
+				};
 			} else if (diff[0] === 1){
-				return {x: currentPos.x, y: currentPos.y + 1};
+				return {
+					x: currentPos.x, 
+					y: currentPos.y + 1,
+					interpolation: {
+						x: this._lerp(cornerValues[3], cornerValues[2], contourValue), 
+						y: this._lerp(cornerValues[1], cornerValues[2], contourValue)
+					}
+				};
 			} else if (diff[1] === -1){
-				return {x: currentPos.x + 1, y: currentPos.y};
+				return {
+					x: currentPos.x + 1, 
+					y: currentPos.y,
+					interpolation: {
+						x: this._lerp(cornerValues[0], cornerValues[1], contourValue), 
+						y: 1 - this._lerp(cornerValues[2], cornerValues[1], contourValue)
+					}
+				};
 			} else if (diff[1] === 1){
-				return {x: currentPos.x - 1, y: currentPos.y};
+				return {
+					x: currentPos.x - 1, 
+					y: currentPos.y,
+					interpolation: {
+						x: this._lerp(cornerValues[3], cornerValues[2], contourValue), 
+						y: this._lerp(cornerValues[1], cornerValues[2], contourValue)
+					}
+				};
 			}
 		}	
 
@@ -205,7 +232,7 @@ torque.extend(IsoRenderer.prototype, torque.Event, {
 		if (grid.length > 0) {
 			var style = this._shader.getLayers()[1].getStyle({}, {zoom: 2});
 			var cellsY = this.globalGrid.length-1;
-			var contourValues = [1];
+			var contourValues = [2 , 16];
 			var ctx = this._ctx;
 			var res = this.options.resolution;
 			var startPos = this.firstTileCoords.pos;