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首页> 外文期刊>Journal of symbolic computation >Parameterizing Surfaces With Certain Special Support Functions, Including Offsets Of Quadrics And Rationally Supported Surfaces
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Parameterizing Surfaces With Certain Special Support Functions, Including Offsets Of Quadrics And Rationally Supported Surfaces

机译:使用某些特殊支持功能对曲面进行参数化,包括二次曲面的偏移和合理支持的曲面

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摘要

We discuss rational parameterizations of surfaces whose support functions are rational functions of the coordinates specifying the normal vector and of a given non-degenerate quadratic form. The class of these surfaces is closed under offsetting. It comprises surfaces with rational support functions and non-developable quadric surfaces, and it is a subset of the class of rational surfaces with rational offset surfaces. We show that a particular parameterization algorithm for del Pezzo surfaces can be used to construct rational parameterizations of these surfaces. If the quadratic form is diagonalized and has rational coefficients, then the resulting parameterizations are almost always described by rational functions with rational coefficients.
机译:我们讨论了曲面的合理参数化,这些曲面的支撑函数是指定法线向量的坐标的有理函数以及给定的非退化二次形式。这些曲面的类别在偏移下关闭。它包括具有有理支撑功能的曲面和不可展开的二次曲面,并且是具有有理偏移曲面的有理曲面类别的子集。我们表明,用于del Pezzo曲面的特定参数化算法可用于构造这些曲面的合理参数化。如果二次形式是对角线的并且具有有理系数,那么生成的参数化几乎总是由具有有理系数的有理函数来描述。

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