@@ -0,0 +1,28 @@
+/**
+ * Move Eye. 
+ * by Simon Greenwold.
+ * 
+ * The camera lifts up (controlled by mouseY) while looking at the same point.
+ */
+
+void setup() {
+  size(640, 360, P3D);
+  fill(204);
+}
+
+void draw() {
+  lights();
+  background(0);
+  
+  // Change height of the camera with mouseY
+  camera(30.0, mouseY, 220.0, // eyeX, eyeY, eyeZ
+         0.0, 0.0, 0.0, // centerX, centerY, centerZ
+         0.0, 1.0, 0.0); // upX, upY, upZ
+  
+  noStroke();
+  box(90);
+  stroke(255);
+  line(-100, 0, 0, 100, 0, 0);
+  line(0, -100, 0, 0, 100, 0);
+  line(0, 0, -100, 0, 0, 100);
+}
@@ -0,0 +1,41 @@
+/**
+ * Perspective. 
+ * 
+ * Move the mouse left and right to change the field of view (fov).
+ * Click to modify the aspect ratio. The perspective() function
+ * sets a perspective projection applying foreshortening, making 
+ * distant objects appear smaller than closer ones. The parameters 
+ * define a viewing volume with the shape of truncated pyramid. 
+ * Objects near to the front of the volume appear their actual size, 
+ * while farther objects appear smaller. This projection simulates 
+ * the perspective of the world more accurately than orthographic projection. 
+ * The version of perspective without parameters sets the default 
+ * perspective and the version with four parameters allows the programmer 
+ * to set the area precisely.
+ */
+
+void setup() {
+  size(640, 360, P3D);
+  noStroke();
+}
+
+void draw() {
+  lights();
+  background(204);
+  float cameraY = height/2.0;
+  float fov = mouseX/float(width) * PI/2;
+  float cameraZ = cameraY / tan(fov / 2.0);
+  float aspect = float(width)/float(height);
+  if (mousePressed) {
+    aspect = aspect / 2.0;
+  }
+  perspective(fov, aspect, cameraZ/10.0, cameraZ*10.0);
+  
+  translate(width/2+30, height/2, 0);
+  rotateX(-PI/6);
+  rotateY(PI/3 + mouseY/float(height) * PI);
+  box(45);
+  translate(0, 0, -50);
+  box(30);
+}
+
@@ -0,0 +1,28 @@
+/**
+ * Directional. 
+ * 
+ * Move the mouse the change the direction of the light.
+ * Directional light comes from one direction and is stronger 
+ * when hitting a surface squarely and weaker if it hits at a 
+ * a gentle angle. After hitting a surface, a directional lights 
+ * scatters in all directions. 
+ */
+
+void setup() {
+  size(640, 360, P3D);
+  noStroke();
+  fill(204);
+}
+
+void draw() {
+  noStroke(); 
+  background(0); 
+  float dirY = (mouseY / float(height) - 0.5) * 2;
+  float dirX = (mouseX / float(width) - 0.5) * 2;
+  directionalLight(204, 204, 204, -dirX, -dirY, -1); 
+  translate(width/2 - 100, height/2, 0); 
+  sphere(80); 
+  translate(200, 0, 0); 
+  sphere(80); 
+}
+
@@ -0,0 +1,29 @@
+/**
+ * Lights 1. 
+ * 
+ * Uses the default lights to show a simple box. The lights() function
+ * is used to turn on the default lighting.
+ */
+ 
+float spin = 0.0;
+
+void setup() 
+{
+  size(640, 360, P3D);
+  noStroke();
+}
+
+void draw() 
+{
+  background(51);
+  lights();
+  
+  spin += 0.01;
+  
+  pushMatrix();
+  translate(width/2, height/2, 0);
+  rotateX(PI/9);
+  rotateY(PI/5 + spin);
+  box(150);
+  popMatrix();
+}
@@ -0,0 +1,36 @@
+/**
+ * Lights 2 
+ * by Simon Greenwold. 
+ * 
+ * Display a box with three different kinds of lights. 
+ */
+
+void setup() 
+{
+  size(640, 360, P3D);
+  noStroke();
+}
+
+void draw() 
+{
+  background(0);
+  translate(width / 2, height / 2);
+  
+  // 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
+  
+  rotateY(map(mouseX, 0, width, 0, PI));
+  rotateX(map(mouseY, 0, height, 0, PI));
+  box(150);
+}
@@ -0,0 +1,25 @@
+/**
+ * Reflection 
+ * by Simon Greenwold. 
+ * 
+ * Vary the specular reflection component of a material
+ * with the horizontal position of the mouse. 
+ */
+
+void setup() {
+  size(640, 360, P3D);
+  noStroke();
+  colorMode(RGB, 1);
+  fill(0.4);
+}
+
+void draw() {
+  background(0);
+  translate(width / 2, height / 2);
+  // Set the specular color of lights that follow
+  lightSpecular(1, 1, 1);
+  directionalLight(0.8, 0.8, 0.8, 0, 0, -1);
+  float s = mouseX / float(width);
+  specular(s, s, s);
+  sphere(120);
+}
@@ -0,0 +1,35 @@
+/**
+ * Spot. 
+ * 
+ * Move the mouse the change the position and concentation
+ * of a blue spot light. 
+ */
+ 
+int concentration = 600; // Try values 1 -> 10000
+
+void setup() 
+{
+  //size(200, 200, P3D);
+  size(640, 360, P3D);
+  noStroke();
+  fill(204);
+  sphereDetail(60);
+}
+
+void draw() 
+{
+  background(0); 
+  
+  // Light the bottom of the sphere
+  directionalLight(51, 102, 126, 0, -1, 0);
+  
+  // Orange light on the upper-right of the sphere
+  spotLight(204, 153, 0, 360, 160, 600, 0, 0, -1, PI/2, 600); 
+  
+  // Moving spotlight that follows the mouse
+  spotLight(102, 153, 204, 360, mouseY, 600, 0, 0, -1, PI/2, 600); 
+  
+  translate(width/2, height/2, 0); 
+  sphere(120); 
+}
+