Substituir Shapes no Java 3D

public BranchGroup createSceneGraph() {
         // Create the root of the branch graph
         BranchGroup objRoot = new BranchGroup();
 
         // Create the transform group node and initialize it to the 
         // identity. Add it to the root of the subgraph.
         TransformGroup objSpin = new TransformGroup();
         objSpin.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
         objRoot.addChild(objSpin);
 
         // Create a simple shape leaf node, add it to the scene graph.
         // ColorCube is a Convenience Utility class
         objSpin.addChild(new ColorCube(0.4));       // <-- tentando alterar nesse ponto, inserindo uma referência de uma outra classe ou ainda um Vector no lugar desta..
 
         // Create a new Behavior object that will perform the desired
         // operation on the specified transform object and add it into
         // the scene graph.
         Alpha rotationAlpha = new Alpha(-1, 4000);
  
         RotationInterpolator rotator =
                 new RotationInterpolator(rotationAlpha, objSpin);
 
         // a bounding sphere specifies a region a behavior is active
         // create a sphere centered at the origin with radius of 100
         BoundingSphere bounds = new BoundingSphere();
         rotator.setSchedulingBounds(bounds);
         objSpin.addChild(rotator);
 
         return objRoot;
     } // end of CreateSceneGraph method