@Override
    protected void updateWorldTransforms() {
        super.updateWorldTransforms();
        computeWorldMatrix();

        if (isGrouped()) {
            groupNode.onTransformChange(this);
        }

        // geometry requires lights to be sorted
        worldLights.sort(true);
    }
<code>updateWorldBound</code> updates the bounding volume that contains
this geometry. The location of the geometry is based on the location of
all this node's parents.

@see Spatial#updateWorldBound()
jme3-core/src/main/java/com/jme3/scene/Geometry.java