createCanvas(400, 400, WEBGL);    // include WEBGL for 3D rendering

}

​

function draw() {

  background(220);

  // Rotate the canvas

  rotateX(frameCount*0.01);

  rotateY(frameCount*0.01);

  // Coordinates for verteces of the pyramid

  line(0,0,0,50,0,0);

  line(50,0,0,50,50,0);

  line(50,50,0,0,50,0);

  line(0,50,0,0,0,0);

  line(0,0,0,25,25,50);

  line(50,0,0,25,25,50);

  line(50,50,0,25,25,50);

  line(0,50,0,25,25,50);

}