Bezier，B样条曲面，同时又一个实例，和给定16个点，能能自动画出Bezier，B样条曲面，能选择是否显示出来控制网格 -Bezier, B-spline surface, while an instance, and given 16 points to automatically draw the Bezier and B-spline surfaces can choose whether to display out of the control grid