//****OBSTACLE*****//
 // A class for an obstacle, just a simple rectangle that is drawn and check if a creature
 // touches it
 
 class Obstacle {
   Rectangle r;
   
   Obstacle(int x, int y, int w, int h) {
     r = new Rectangle(x, y, w, h);
   }
   
   void render() {
     noStroke();
     fill(100);
     rect(r.x, r.y, r.width, r.height);
   }
   
   boolean contains(Vector3D spot) {
     if(r.contains((int)spot.x(),(int)spot.y())) {
       return true;
     } else {
       return false;
     }
   }
 }