Merge pull request #422 from jahow/patch-1

Fix in Geometry.copy()

Babylon/Mesh/babylon.geometry.ts

@@ -394,7 +394,8 @@
             var stopChecking = false;
 
             for (var kind in this._vertexBuffers) {
-                vertexData.set(this.getVerticesData(kind), kind);
+                // using slice() to make a copy of the array and not just reference it
+                vertexData.set(this.getVerticesData(kind).slice(0), kind);
 
                 if (!stopChecking) {
                     updatable = this.getVertexBuffer(kind).isUpdatable();
@@ -729,4 +730,4 @@
             }
         }
     }
-} 
+}