// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 14-4: Pyramid using beginShape(TRIANGLES)
  
  void setup() {
    size(200,200,P3D);
  }
  
  void draw() {
    background(255);
    
    // The pyramid's vertices are drawn relative to a centerpoint.
    // Therefore, we call translate() to place the pyramid properly in the window.
    // A slightly better option might be to include the translate in the drawPyramid() function and pass in x,y,z as arguments
    translate(100,100,0); 
    drawPyramid(150);
  }
  
  // The function sets the vertices for the pyramid around the centerpoint at a flexible distance, 
  // depending on the number passed in as an argument.
  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(255,150); // Note that each polygon can have its own color.
    vertex(-t,-t,-t);
    vertex( t,-t,-t);
    vertex( 0, 0, t);
    
    fill(150,150);
    vertex( t,-t,-t);
    vertex( t, t,-t);
    vertex( 0, 0, t);
    
    fill(255,150);
    vertex( t, t,-t);
    vertex(-t, t,-t);
    vertex( 0, 0, t);
    
    fill(150,150);
    vertex(-t, t,-t);
    vertex(-t,-t,-t);
    vertex( 0, 0, t);
    
    endShape();
  }