public Spatial rotate(Quaternion rot) {
        this.localTransform.getRotation().multLocal(rot);
        setTransformRefresh();

        return this;
    }
Rotates the spatial by the given rotation.

@param rot the intrinsic rotation to apply (not null, unaffected)
@return The spatial on which this method is called, e.g <code>this</code>.
jme3-core/src/main/java/com/jme3/scene/Spatial.java