This test was taken from Processing.org which tests to make
sure the ambientLight() and directionalLight() work correctly on a box and sphere.
// Test from Processing.org
void setup() {
size(100, 100, P3D);
}
void draw() {
background(0);
noStroke();
directionalLight(126, 126, 126, 0, 0, -1);
ambientLight(102, 102, 102);
translate(32, 50, 0);
rotateY(PI/5);
box(40);
translate(60, 0, 0);
sphere(30);
}