code: public void vertex(Vector3D v) {
          MODE = LINES_3D;
          this.x.add(v.getX());
          this.y.add(v.getY());
          this.z.add(v.getZ());
          colors.add(this.strokeColor);
          calcG();
      }
docs: Adds the point to Lines.
  
  @param v The coordinates of a new added point.