When the vector potential function and the differential of the scalar potential function are computed, singular points would occur on TPM.
但在计算矢量位函数和标量位函数的微分过程中，TPM模型将产生奇异点。
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。
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