delphi实现等高线绘制算法，用vc可以打开，编译以后就可以看到结果-delphi achieve contour mapping algorithm can be used vc open compiler they can see the result

三维场景中的三维凸壳算法及实现。可用鼠标转动场景，可用鼠标拖动凸壳的各顶点。-Three-dimensional scene in three-dimensional convex hull algorithm and implementation.