Three characterizations of geometric continuity for parametric curves
Parametric spline curves are typically constructed so that the first n parametric derivatives agree where the curve segments abut. This type of continuity condition has become known as Cn or nth order geometric continuity. It has previously bee n shown that the use of parametric continuity disallows many parametrizations which generate geometrically smooth curves
Print Book, English, 1988
University of California, Berkeley, Computer Science Division, Berkeley, Calif., 1988