说明：  在工程绘图中，经常需要实现三维速度场的绘制，本案例为本人编制，采用VC++的MFC和OpenGL实现对话框界面内3D速度场分布，对三维图像开发编程具有十分重要参考作用。
(In engineering drawing, it is often necessary to achieve the drawing of three-dimensional velocity fields. This case was developed by myself, using MFC and OpenGL in VC++to achieve the distribution of 3D velocity fields in the dialog box interface. It has a very important reference value for three-dimensional image development programming.)