diff --git a/chapter-01/01.03-vertices.html b/chapter-01/01.03-vertices.html
index 12c0b6b..9fbc004 100644
--- a/chapter-01/01.03-vertices.html
+++ b/chapter-01/01.03-vertices.html
@@ -97,7 +97,7 @@
         vertices.forEach(function (vertex) {
             var vertexSphere = new THREE.SphereGeometry(0.15);
             var vertexMesh = new THREE.Mesh(vertexSphere, vertexMaterial);
-            vertexMesh.position = vertex;
+            vertexMesh.position.copy(vertex);
             scene.add(vertexMesh);
         });
     }
diff --git a/chapter-02/02.01-globe-and-camera.html b/chapter-02/02.01-globe-and-camera.html
index 7260ad0..5ba0d80 100644
--- a/chapter-02/02.01-globe-and-camera.html
+++ b/chapter-02/02.01-globe-and-camera.html
@@ -62,7 +62,6 @@
         // setup the control object for the control gui
         control = new function () {
             this.rotationSpeed = 0.005;
-            this.opacity = 0.6;
         };
 
         // add extras
diff --git a/chapter-02/02.03-add-lighting.html b/chapter-02/02.03-add-lighting.html
index 2f624f3..cdc496b 100644
--- a/chapter-02/02.03-add-lighting.html
+++ b/chapter-02/02.03-add-lighting.html
@@ -58,13 +58,13 @@
 
         // now add some better lighting
         var ambientLight = new THREE.AmbientLight(0x111111);
-        ambientLight.name='ambient';
+        ambientLight.name = 'ambient';
         scene.add(ambientLight);
 
         // add sunlight (light
         var directionalLight = new THREE.DirectionalLight(0xffffff, 1);
-        directionalLight.position = new THREE.Vector3(100,10,-50);
-        directionalLight.name='directional';
+        directionalLight.position.set(100, 10, -50);
+        directionalLight.name = 'directional';
         scene.add(directionalLight);
 
         // position and point the camera to the center of the scene
@@ -77,7 +77,7 @@
         cameraControl = new THREE.OrbitControls(camera);
 
         // setup the control object for the control gui
-        control = new function () {
+        control = new function() {
             this.rotationSpeed = 0.001;
             this.ambientLightColor = ambientLight.color.getHex();
             this.directionalLightColor = directionalLight.color.getHex();
@@ -147,8 +147,8 @@
         // update the camera
         cameraControl.update();
 
-        scene.getObjectByName('earth').rotation.y+=control.rotationSpeed;
-        scene.getObjectByName('clouds').rotation.y+=control.rotationSpeed*1.1;
+        scene.getObjectByName('earth').rotation.y += control.rotationSpeed;
+        scene.getObjectByName('clouds').rotation.y += control.rotationSpeed * 1.1;
 
         // update light colors
         scene.getObjectByName('ambient').color = new THREE.Color(control.ambientLightColor);
diff --git a/chapter-02/02.04-starry-background.html b/chapter-02/02.04-starry-background.html
index 005d636..3623a91 100644
--- a/chapter-02/02.04-starry-background.html
+++ b/chapter-02/02.04-starry-background.html
@@ -76,7 +76,7 @@
 
             // add sunlight (light
             var directionalLight = new THREE.DirectionalLight(0xffffff, 1);
-            directionalLight.position = new THREE.Vector3(100,10,-50);
+            directionalLight.position.set(100,10,-50);
             directionalLight.name='directional';
             scene.add(directionalLight);
 
diff --git a/chapter-02/02.05-advanced-textures.html b/chapter-02/02.05-advanced-textures.html
index 8833b8e..902f7e2 100644
--- a/chapter-02/02.05-advanced-textures.html
+++ b/chapter-02/02.05-advanced-textures.html
@@ -82,7 +82,7 @@
 
     // add sunlight (light
     var directionalLight = new THREE.DirectionalLight(0xffffff, 1);
-    directionalLight.position = new THREE.Vector3(200, 10, -50);
+    directionalLight.position.set(200, 10, -50);
     directionalLight.name = 'directional';
     scene.add(directionalLight);