public void setup() {
		
		  
		
		  background(255);
		  noFill();
		  size(400, 400, P3D);
		  
		  cam = new PeasyCam(this, 100);
		  
		  visited = new boolean[width][height];
		  
		  frameRate(20);
		  step = 15;

		  // Create a walker object and put into an ArrayList
		  for (int i = 0; i < numWalkers; i++){
		  walkers.add(new Walker(this, step));
		  }
		  rect(0, 0, 100, 200);
		
	}