// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 14-10: Pyramid
  
  float theta = 0.0;
  
  void setup() {
    size(200,200,P3D);
  }
  
  void draw() {
    background(255);
    theta += 0.01;
    
    translate(100,100,0);
    rotateX(theta);
    rotateY(theta);
    drawPyramid(50);
    
    // translate the scene again
    translate(50,50,20);
    // call the pyramid drawing function
    drawPyramid(10);
  }
  
  void drawPyramid(int t) {
    stroke(0);
    
    // this pyramid has 4 sides, each drawn as a separate triangle
    // each side has 3 vertices, making up a triangle shape
    // the parameter " t " determines the size of the pyramid
    beginShape(TRIANGLES);
    
    fill(150,0,0,127);
    vertex(-t,-t,-t);
    vertex( t,-t,-t);
    vertex( 0, 0, t);
    
    fill(0,150,0,127);
    vertex( t,-t,-t);
    vertex( t, t,-t);
    vertex( 0, 0, t);
    
    fill(0,0,150,127);
    vertex( t, t,-t);
    vertex(-t, t,-t);
    vertex( 0, 0, t);
    
    fill(150,0,150,127);
    vertex(-t, t,-t);
    vertex(-t,-t,-t);
    vertex( 0, 0, t);
    
    endShape();
  }