B-Spline curves and curve surfaces are the most commonly used parametric curves and surfaces in Computer Graphics.
样条曲线曲面是在计算机图形学中应用最广泛的参数曲线曲面类型。
Among the modeling methods used in the CAD parametric curves and surfaces, the technique of blending curves and surfaces is being wildly study.
在CAD参数曲线曲面造型方法中，混合曲线曲面技术正被广泛研究，本文分两大部分。
However, due to the advantages of implicit curves and surfaces which the parametric curves and surfaces don't have, sometime we need to use the implicit form of a rational curves and surfaces.
然而由于曲线曲面的隐式形式具有参数形式所不具有的优点，有时我们还需要求参数曲线曲面的隐式表达式。
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