@Override
    public boolean intersectsSphere(BoundingSphere sphere, TempVars vars) {
        return true;
    }
An ambient light adds a constant color to the scene.
<p>
Ambient lights are unaffected by the surface normal, and are constant
regardless of the model's location. The material's ambient color is
multiplied by the ambient light color to get the final ambient color of
an object.

@author Kirill Vainer
jme3-core/src/main/java/com/jme3/light/AmbientLight.java