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发信人: westlake (天行健), 信区: Graphics
标  题: Re: 如何计算Bezier曲面上一点的法向量?
发信站: BBS 水木清华站 (Fri Oct 31 17:32:03 1997)

【在 freeze (冰人) 的大作中提到: 】
∶ 如题
the normal vector of a surface is the cross product of two curves' tagenty,
which interest at the point.  a parametric curve of Bezier surface is
form_simple, and its tagenty is easy to be found.

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