diff --git a/chapter-02/01-basic-scene.html b/chapter-02/01-basic-scene.html
index e8606b91..22648071 100644
--- a/chapter-02/01-basic-scene.html
+++ b/chapter-02/01-basic-scene.html
@@ -106,9 +106,9 @@
 
 
                 // position the cube randomly in the scene
-                cube.position.x=-30 + Math.round((Math.random() * planeGeometry.width));
+                cube.position.x=-30 + Math.round((Math.random() * planeGeometry.parameters.width));
                 cube.position.y= Math.round((Math.random() * 5));
-                cube.position.z=-20 + Math.round((Math.random() * planeGeometry.height));
+                cube.position.z=-20 + Math.round((Math.random() * planeGeometry.parameters.height));
 
                 // add the cube to the scene
                 scene.add(cube);
@@ -168,4 +168,4 @@
 
 </script>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/chapter-02/02-foggy-scene.html b/chapter-02/02-foggy-scene.html
index ce2231c9..fed873e3 100644
--- a/chapter-02/02-foggy-scene.html
+++ b/chapter-02/02-foggy-scene.html
@@ -106,9 +106,9 @@
                 cube.castShadow = true;
 
                 // position the cube randomly in the scene
-                cube.position.x=-30 + Math.round((Math.random() * planeGeometry.width));
+                cube.position.x=-30 + Math.round((Math.random() * planeGeometry.parameters.width));
                 cube.position.y= Math.round((Math.random() * 5));
-                cube.position.z=-20 + Math.round((Math.random() * planeGeometry.height));
+                cube.position.z=-20 + Math.round((Math.random() * planeGeometry.parameters.height));
 
                 // add the cube to the scene
                 scene.add(cube);
@@ -168,4 +168,4 @@
 
 </script>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/chapter-02/03-forced-materials.html b/chapter-02/03-forced-materials.html
index 4aada27e..9df50c7b 100644
--- a/chapter-02/03-forced-materials.html
+++ b/chapter-02/03-forced-materials.html
@@ -105,9 +105,9 @@
                 cube.castShadow = true;
 
                 // position the cube randomly in the scene
-                cube.position.x=-30 + Math.round((Math.random() * planeGeometry.width));
+                cube.position.x=-30 + Math.round((Math.random() * planeGeometry.parameters.width));
                 cube.position.y= Math.round((Math.random() * 5));
-                cube.position.z=-20 + Math.round((Math.random() * planeGeometry.height));
+                cube.position.z=-20 + Math.round((Math.random() * planeGeometry.parameters.height));
 
                 // add the cube to the scene
                 scene.add(cube);
@@ -167,4 +167,4 @@
 
 </script>
 </body>
-</html>
\ No newline at end of file
+</html>