A Ruled Surface parameterization
is called noncylindrical if
is nowhere **0**. A noncylindrical ruled surface always has a parameterization of the
form

where and , where is called the Striction Curve of

**References**

Gray, A. ``Noncylindrical Ruled Surfaces.'' §17.3 in *Modern Differential Geometry of Curves and Surfaces.*
Boca Raton, FL: CRC Press, pp. 345-349, 1993.

© 1996-9

1999-05-25