The other kind of feature points are those where the absolute value of the scalar product of its normal vector and the view vector is less than a threshold.
另一类特征点是由法向量和视线向量的内积决定的，内积小于给定阈值的点称为特征点。
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。
The code and descriptions in this article are a highly simplified view of vector Spaces and how to search them effectively.
本文中的代码和描述高度简化地演示了向量空间及高效搜索向量空间的方法。
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