// 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();
}