Hello GL2 示例
“Hello GL2”示例演示了 Qt OpenGL 相关类的基本用法。
Qt 提供了 `QOpenGLWidget ` 类，用于在标准应用程序用户界面中渲染 OpenGL 图形。通过继承该类并重写事件处理函数，可以在小部件上显示 3D 场景，这些小部件可以放置在布局中，通过信号和槽与其他对象连接，并像其他任何小部件一样进行操作。
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