MFC环境下使用OPENGL实现动态拉框，用双缓冲区解决白色闪屏，正射投影、透视投影、正交投影切换显示-OPENGL MFC environment to implement dynamic pull box, white splash screen double buffer solution, orthographic projection, perspective projection, orthogonal projection to switch the display

一个C++三维投影透视的代码，通过本代码你可以了解下三维投影、三维透视的相关原理与实现方法，本例相对简单些，运行示例截图如上所示。-A three-dimensional projection perspective C++ code through the code you can understand the three-dimensional projection, the relevant principles and implementation of a three-dimensio