或其对偶绝对二次曲面 The absolute quadric
提出了一种变换法，使对偶绝对二次曲面像的各个元素变到同一个数量级上，可以使求解过程更具有鲁棒性。
To solve the problem, the method that all the elements of the image of dual absolute quadric are transformed into the same magnitude is proposed.
利用SBGB型基函数的对偶泛函，推导出SBGB三角曲面片到退化矩形曲面片的顶点转化公式。
This thesis also presents an explicit formula that converts a triangular SBGB patch of degree n to a degenerate rectangular SBGB patch of degree nxn by reparametrization and the SBGB dual bases.
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