code: public int convexHullSize() {
  		int ans = 0;
  		Iterator<Vector3> it = this.getConvexHullVerticesIterator();
  		while (it.hasNext()) {
  			ans++;
  			it.next();
  		}
  		return ans;
  	}
docs: compute the number of vertices in the convex hull. <br />
  NOTE: has a 'bug-like' behavor: <br />
  in cases of colinear - not on a asix parallel rectangle,
  colinear points are reported
  
  @return the number of vertices in the convex hull.