diff --git a/slice_test.html b/slice_test.html
index 2ad4928..4d31074 100644
--- a/slice_test.html
+++ b/slice_test.html
@@ -61,21 +61,23 @@ var geometry = new THREE.TorusGeometry(20, 10, 10, 10);
 var mesh = new THREE.Mesh(geometry, material);
 scene.add(mesh);
 
-var slicer = new D3D.Slicer().setGeometry(geometry);
-//var slices = slicer.slice(200, 0.2);
-var slices = slicer.slice(1, 1);
+(function () {
+	var slicer = new D3D.Slicer().setGeometry(geometry);
+	var slices = slicer.slice(200, 0.2);
+	//var slices = slicer.slice(1, 1);
 
-CAL.Scene.setCanvas(document.getElementById("canvas"));
+	CAL.Scene.setCanvas(document.getElementById("canvas"));
 
+	//error at layer 0;
+	//maybe because of geomety
+	var layer = 4;
 
-var shapes = [];
+	var shapes = [];
 
-for (var layer = 0; layer < slices.length; layer ++) {
 	var slice = slices[layer];
 
 	for (var i = 0; i < slice.length; i ++) {
 		var shape = new CAL.Shape({shapeColor: false});
-		CAL.Scene.add(shape);
 		shapes.push(shape);
 
 		for (var j = 0; j < slice[i].length; j ++) {
@@ -83,22 +85,21 @@ for (var layer = 0; layer < slices.length; layer ++) {
 			shape.addPoint(new CAL.Vector((point.x-100) * 5 + 200, (point.y-100) * 5 + 200));
 		}
 	}
-}
 
-CAL.Scene.draw();
+	for (var i = 0; i < shapes.length; i ++) {
+		var shape = shapes[i];
 
-CAL.Scene.context.strokeStyle = "#FF0000";
+		shape.draw(CAL.Scene.context);
+		CAL.Scene.context.strokeStyle = "#FF0000";
 
-for (var i = 0; i < shapes.length; i ++) {
-	var shape = shapes[i];
+		for (var j = 0; j < shape.points.length; j ++) {
+			var normal = shape.getNormal(j).scale(20);
+			var point = shape.points[j];
 
-	for (var j = 0; j < shape.points.length; j ++) {
-		var normal = shape.getNormal(j).scale(20);
-		var point = shape.points[j];
-
-		normal.draw(CAL.Scene.context, point.x, point.y);
+			normal.draw(CAL.Scene.context, point.x, point.y);
+		}
 	}
-}
+})();
 
 (function animate () {
 	requestAnimationFrame(animate);
diff --git a/src/slicer.js b/src/slicer.js
index 02ee79a..3e1811d 100644
--- a/src/slicer.js
+++ b/src/slicer.js
@@ -87,7 +87,6 @@ D3D.Slicer.prototype.slice = function (height, step) {
 	var	plane = new THREE.Plane();
 
 	for (var z = 0; z < height; z += step) {
-		z += 1;
 		plane.set(new THREE.Vector3(0, -1, 0), z);
 
 		var slice = [];
@@ -133,7 +132,7 @@ D3D.Slicer.prototype.slice = function (height, step) {
 							var normal = new THREE.Vector2().copy(intersection).sub(intersections[index]).normal().normalize();
 							var faceNormal = faceNormals[j];
 
-							if (normal.dot(faceNormal) < 0) {
+							if (normal.dot(faceNormal) > 0) {
 								break;
 							}
 							else {