static public PVector fromAngle(float angle,PVector target){
  if (target == null) {
    target=new PVector((float)Math.cos(angle),(float)Math.sin(angle),0);
  }
 else {
    target.set((float)Math.cos(angle),(float)Math.sin(angle),0);
  }
  return target;
}

static public PVector fromAngle ( float angle , PVector target ) { if ( target == null ) { target = new PVector ( ( float ) Math . cos ( angle ) , ( float ) Math . sin ( angle ) , 0 ) ; } else { target . set ( ( float ) Math . cos ( angle ) , ( float ) Math . sin ( angle ) , 0 ) ; } return target ; }
make a new 2d unit vector from an angle
