LightsGL. Modified by an example by Simon Greenwold.

Display a box with three different kinds of lights.

import processing.opengl.*;

void setup() 
{
  size(800, 600, OPENGL);
  noStroke();
}

void draw() 
{
  defineLights();
  background(0);
  
  for (int x = 0; x <= width; x += 100) {
    for (int y = 0; y <= height; y += 100) {
      pushMatrix();
      translate(x, y);
      rotateY(map(mouseX, 0, width, 0, PI));
      rotateX(map(mouseY, 0, height, 0, PI));
      box(90);
      popMatrix();
    }
  }
}

void defineLights() {
  // Orange point light on the right
  pointLight(150, 100, 0,   // Color
             200, -150, 0); // Position

  // Blue directional light from the left
  directionalLight(0, 102, 255, // Color
                   1, 0, 0);    // The x-, y-, z-axis direction

  // Yellow spotlight from the front
  spotLight(255, 255, 109,  // Color
            0, 40, 200,     // Position
            0, -0.5, -0.5,  // Direction
            PI / 2, 2);     // Angle, concentration
}