By making use of transformation of coordinate translation, coordinate rotation, we deduced general formula about area of rotational surface.
利用坐标平移、旋转变换，导出旋转曲面面积求法的一般公式。
Principal directions of a rotational surface were mapped to Gaussian sphere in the algorithm, and principal direction Gaussian image(PDGI) was generated.
该算法对旋转面主方向映射到高斯球面，生成主方向高斯图像（PDGI）。
Principal directions of a rotational surface were mapped to Gaussian sphere in the algorithm, and principal direction Gaussian image(PDGI) was generated.
该算法对旋转面主方向映射到高斯球面，生成主方向高斯图像（PDGI）。
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