HP b2600 Reference Manual page 306

N
gluNurbsCurve
When gluNurbsCurve appears between a gluBeginTrim/gluEndTrim pair, it is used to
describe a trimming curve on a NURBS surface. If type is GLU_MAP1_TRIM_2, then it
describes a curve in two-dimensional (u and v) parameter space. If it is
GLU_MAP1_TRIM_3, then it describes a curve in two-dimensional homogeneous (u, v,
and w) parameter space. See the gluBeginTrim reference page for more discussion about
trimming curves.
Notes
To define trim curves that stitch well, use gluPwlCurve.
See Also
gluBeginCurve,
gluBeginTrim,
gluNewNurbsRenderer,
gluPwlCurve
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Chapter 12