以高斯曲率和法向量为随机变量，将洛伦兹曲线扩展为三维，得到洛伦兹曲面。
Taking gauss curvatures and normal vectors as random variables, Lorentz Curve was extended to 3d Lorentz Surface.
采用移动向量法求取轮廓曲线的数字曲率。
Besides, Moving vector analysis is introduced to compute the digital curvature of the profile.
为了更好地去除噪声，并保持模型的突出特征，提出了一种鲁棒的点模型多边滤波器降噪算法，该算法充分考虑了模型表面的法向量、曲率等内蕴几何量和噪声之间的关系。
In order to remove the noise efficiently and preserve the sharp features of the models, a denoising algorithm of a robust multilateral filter for point-sampled models is presented.
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