鉴于增强现实系统中，虚拟物体与真实环境之间是否具有正确的遮挡关系会影响到虚实融合能否取得逼真的效果，为此根据一种新型光学透视式头盔显示器，提出了一种利用OpenGL来绘制虚拟网格遮挡平面，以便使虚拟物体呈现被裁剪的形态，而与真实物体融合后可呈现出实挡虚效果的方法。这种方法，在程序实现方面相对较为容易，且计算量较低，因而更适宜实时系统的使用。通过实验可以看出，采用OpenGL对虚拟物体与真实场景的深度数组进行逐点深度比较来绘制遮挡平面的方法是可行的。

In an augmented reality (AR) system, whether there is a correct real virtual occlusion is a crucial problem, and it will influence whether the compositing of real and virtual worlds is vivid. A new method for real virtual occlusion according to a new design of optical see through HMD is presented. A gridding plane using the OpenGL are drawn to block the virtual object and when the virtual object is overlapped with the real object it will appear that the real object occlude the virtual one. It is easier for us to design programme and is more feasible for a real time system using this method. The experiment results indicate that this method is correct and viable.