gluPwlCurve(3G)		       OpenGL Reference		       gluPwlCurve(3G)

NAME    [Toc]    [Back]

     gluPwlCurve - describe a piecewise	linear NURBS trimming curve

C SPECIFICATION    [Toc]    [Back]

     void gluPwlCurve( GLUnurbs* nurb,
		       GLint count,
		       GLfloat*	data,
		       GLint stride,
		       GLenum type )

PARAMETERS    [Toc]    [Back]

     nurb    Specifies the NURBS object	(created with gluNewNurbsRenderer).

     count   Specifies the number of points on the curve.

     data    Specifies an array	containing the curve points.

     stride  Specifies the offset (a number of single-precision	floating-point
	     values) between points on the curve.

     type    Specifies the type	of curve.  Must	be either GLU_MAP1_TRIM_2 or
	     GLU_MAP1_TRIM_3.

DESCRIPTION    [Toc]    [Back]

     gluPwlCurve describes a piecewise linear trimming curve for a NURBS
     surface.  A piecewise linear curve	consists of a list of coordinates of
     points in the parameter space for the NURBS surface to be trimmed.	These
     points are	connected with line segments to	form a curve. If the curve is
     an	approximation to a curve that is not piecewise linear, the points
     should be close enough in parameter space that the	resulting path appears
     curved at the resolution used in the application.

     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 information about	trimming
     curves.

NOTES    [Toc]    [Back]

     To	describe a trim	curve that closely follows the contours	of a NURBS
     surface, call gluNurbsCurve.

SEE ALSO    [Toc]    [Back]

     gluBeginCurve, gluBeginTrim, gluNewNurbsRenderer, gluNurbsCurve


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