@Override
    protected void breadthFirstTraversal(SceneGraphVisitor visitor, Queue<Spatial> queue) {
    }
Sets the model bound to use for this geometry.
This alters the bound used on the mesh as well via
{@link Mesh#setBound(com.jme3.bounding.BoundingVolume) } and
forces the world bounding volume to be recomputed.

@param modelBound The model bound to set
jme3-core/src/main/java/com/jme3/scene/Geometry.java