一个计算二维ZP-box样条（箱样条）的c++程序，8个方向为[1,0 1,0 0,1 0,1 1,1 1,1 -1,1 -1,1]-A calculation of two-dimensional spline ZP-box (box-spline) and c++ program, eight directions of [1,0 1,0 0,1 0,1 1,1 1,1 -1, 1 -1,1]

一个三维空间中7-方向箱样条（box spline）的求值器，该箱样条是二维ZP箱样条的推广。-A three-dimensional space, 7- direction box spline (box spline) of the evaluator, the box spline is a two-dimensional box spline ZP promotion.