这是一个在三位场景绘制使用camera改变视角的例子，方便用户从多个方向对场景进行观察，非常适合opengl编程初学者学习使用！-This is a drawing of the three scenes to change the use of camera angle example, a number of user-friendly direction from the scene observed opengl very suitable for beginners to learn

Camera的设定和漫游实现，摄像漫游_有了摄像机你就可以在OpenGL场景中自由地漫游了。-Camera settings and roaming achieved _ roaming camera you can have the camera in OpenGL scene of roaming freely.