This test was taken from Processing.org which tests to make
sure the spotLights() works correctly on a sphere.
// Test from Processing.org size(100, 100, P3D); background(0); noStroke(); background(0); spotLight(51, 102, 126, 50, 50, 200, 0, 0, -1, PI/3, 400.0 ); translate(80, 50, 0); sphere(30);