They have the properties like the quadratic uniform b - spline basis functions . the piecewise polynomial curves generated by the above - mentioned functions possess the same structure and geometry properties as piecewise quadratic uniform b - spline curve 它們具有二次均勻b樣條基函數(shù)的性質(zhì),且用它們生成的分段多項式曲線具有與分段二次均勻b樣條曲線相同的結(jié)構(gòu)和幾何性質(zhì)。