This is obvious: if you view the object from a different Angle, the impostor needs to change to reflect your new viewpoint.
这显而易见的：如果你从一个不同的角度观察对象时，视点替用特效需要改变以反映你新的视点。
The second situation in which the impostor needs to be updated is when the Angle between the object and the camera view vector changes by more than a few degrees.
第二个需要更新的情形是，当对象与照相机观察矢量之间的角度发生大范围变化时。
This article describe the concept and definiens of Angle of view of super wide Angle bore hole television system, and by means of this television system to measure the object in the well accurately.
本文提出了超广角井下电视系统视场角的概念及标定，以及利用该电视系统对井内落物尺寸进行精确测量的方法。
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