whole_func_string: function VertexNode(point) {
      this.point = point;
      this.prev = null;
      this.next = null;
      this.face = null; // the face that is able to see this vertex
    }
func_code_string: function VertexNode(point) {
      this.point = point;
      this.prev = null;
      this.next = null;
      this.face = null; // the face that is able to see this vertex
    }
func_documentation_string: A vertex as a double linked list node.