//Light no. 1: directional light.
Color3f lightColour1 = new Color3f(0.8f, 0.8f, 0.8f);
Vector3f lightDir1 = new Vector3f(0.0f, 4.0f, -1.0f);
DirectionalLight light1 = new DirectionalLight(lightColour1, lightDir1);
light1.setInfluencingBounds(bounds);
bgLight.addChild(light1);
//Light no. 2: a point light.
Color3f lightColour2 = new Color3f(0.3f, 0.3f, 0.3f);