利用MATLAB编程，根据级配参数，在指定区域内进行三维石头的重构与投放。结果写入stl文件，后续可视化操作可在逆向工程软件Geomagic中处理。-Using MATLAB programming, according to grading parameters, the three-dimensional reconstruction of the stone and served in the designated area. Results are written stl file, s