【摘要】 本文先介绍与曲线曲面延伸有关的非均匀有理Ｂ样条（ＮＵＲＢＳ）技术，然后研究ＮＵＲＢＳ曲线曲面的满足切平面连续和曲率连续的延伸的算法，特别地详细推导曲率连续的数学表达式。更多还原

【Abstract】 ? First, introduced is the NURBS technique related to constructing extensions of curves and surfaces. Then, presented is the approach to generate extensions of NURBS curves and surfaces satisfying tangent plane and curvature continuities. Specifically, the formula of calculating curvature continuity is derived in detail.更多还原