public static void main(String[] args) {
        TestLightControlDirectional app = new TestLightControlDirectional();
        app.start();
    }
Creates a directional light controlled by rotating a node. The light will shine on a surrounding sphere.
The light will rotate on each axis, then on a random axis, then return to the X
axis.

@author Markil 3
jme3-examples/src/main/java/jme3test/light/TestLightControlDirectional.java