计算规则长方体与球体的叠加重力异常值，绘制等值线与三维图 以及重力异常数据平滑拟合程序。(Calculate the superposition of gravity values between cuboid and sphere, draw isoline and 3D map, and smooth fitting program of gravity anomaly data.)

从文件读取三维数据，绘制三维表面形貌图，并根据实际数据插值，平滑处理(Read three-dimensional data and draw three-dimensional surface topography)