fixed shape point order

only dot product is supposed to be > 0 in my code it’s < 0. some where
mathmatical problem maybe fix some where in the future (it works just
ugly)

slice_test.html

@@ -55,7 +55,7 @@ var camera = new THREE.PerspectiveCamera(75, renderer.domElement.width/renderer.
 applyMouseControls(renderer, camera, 1000);
 
 var material = new THREE.MeshLambertMaterial({color: 0x000000, wireframe: true});
-var geometry = new THREE.TorusGeometry(20, 10, 4, 6);
+var geometry = new THREE.TorusGeometry(20, 10, 10, 10);
 //var geometry = new THREE.BoxGeometry(10, 10, 10, 1, 1, 1);
 //var geometry = new THREE.SphereGeometry(40, 10, 10);
 var mesh = new THREE.Mesh(geometry, material);
@@ -89,12 +89,9 @@ CAL.Scene.draw();
 
 CAL.Scene.context.strokeStyle = "#FF0000";
 
-
 for (var i = 0; i < shapes.length; i ++) {
 	var shape = shapes[i];
 
-	console.log(shape.points.length);
-
 	for (var j = 0; j < shape.points.length; j ++) {
 		var normal = shape.getNormal(j).scale(20);
 		var point = shape.points[j];

src/slicer.js

@@ -39,7 +39,8 @@ D3D.Slicer.prototype.addLine = function (a, b) {
 
 		this.lines.push({
 			line: new THREE.Line3(this.geometry.vertices[a], this.geometry.vertices[b]),
-			connects: []
+			connects: [],
+			normals: []
 		});
 	}
 
@@ -53,6 +54,7 @@ D3D.Slicer.prototype.createLines = function () {
 
 	for (var i = 0; i < this.geometry.faces.length; i ++) {
 		var face = this.geometry.faces[i];
+		var normal = new THREE.Vector2().set(face.normal.x, face.normal.z).normalize();
 
 		//check for only adding unique lines
 		//returns index of said line
@@ -64,8 +66,12 @@ D3D.Slicer.prototype.createLines = function () {
 
 		//something wrong here, 3 face can go in different direction
 		this.lines[a].connects.push(b, c);
-		this.lines[b].connects.push(a, c);
+		this.lines[b].connects.push(c, a);
 		this.lines[c].connects.push(a, b);
+
+		this.lines[a].normals.push(normal, normal);
+		this.lines[b].normals.push(normal, normal);
+		this.lines[c].normals.push(normal, normal);
 	}
 
 	//sort lines on min height
@@ -119,18 +125,25 @@ D3D.Slicer.prototype.slice = function (height, step) {
 					done.push(index);
 
 					var connects = this.lines[index].connects;
+					var faceNormals = this.lines[index].normals;
 					for (var j = 0; j < connects.length; j ++) {
 						index = connects[j];
 
 						if (intersections[index] && done.indexOf(index) === -1) {
-							break;
+							var normal = new THREE.Vector2().copy(intersection).sub(intersections[index]).normal().normalize();
+							var faceNormal = faceNormals[j];
+
+							if (normal.dot(faceNormal) < 0) {
+								break;
+							}
+							else {
+								index = -1;
+							}
 						}
 						else {
 							index = -1;
 						}
 					}
-
-					console.log(j);
 				}
 
 				//think this check is not nescesary, always higher as 0

src/utils.js

@@ -11,6 +11,13 @@ var D3D = {
 	"contact": "develop@doodle3d.com"
 };
 
+THREE.Vector2.prototype.normal = function () {
+	var x = this.y;
+	var y = -this.x;
+
+	return this.set(x, y);
+};
+
 function sendAPI (url, data, callback) {
 	"use strict";