八叉树算法代码。八叉树算法在减少数值计算空间的应用广泛。在美国SEG等顶尖地球物理杂志上已经发表过相关文章-Octree algorithm code. Octree algorithm in reducing numerical calculation of the space wide application. In the United States such as SEG top geophysical magazine published related articles

树结构程序，建立三维的单元网格八叉树分层结构。-tree fortran code 3 Dimension，creat 3d elements tree structure.