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- '\" e
- '\"! eqn | mmdoc
- '\"macro stdmacro
- .ds Vn Version 1.2
- .ds Dt 6 March 1997
- .ds Re Release 1.2.0
- .ds Dp May 02 11:53
- .ds Dm 37 pwlcurve.
- .ds Xs 35475 4 pwlcurve.gl
- .TH GLUPWLCURVE 3G
- .SH NAME
- .B "gluPwlCurve
- \- describe a piecewise linear NURBS trimming curve
- .SH C SPECIFICATION
- void \f3gluPwlCurve\fP(
- GLUnurbs* \fInurb\fP,
- .nf
- .ta \w'\f3void \fPgluPwlCurve( 'u
- GLint \fIcount\fP,
- GLfloat* \fIdata\fP,
- GLint \fIstride\fP,
- GLenum \fItype\fP )
- .fi
- .EQ
- delim $$
- .EN
- .SH PARAMETERS
- .TP \w'\fIstride\fP\ \ 'u
- \f2nurb\fP
- Specifies the NURBS object (created with \%\f3gluNewNurbsRenderer\fP).
- .TP
- \f2count\fP
- Specifies the number of points on the curve.
- .TP
- \f2data\fP
- Specifies an array containing the curve points.
- .TP
- \f2stride\fP
- Specifies the offset (a number of single-precision floating-point values)
- between points on the curve.
- .TP
- \f2type\fP
- Specifies the type of curve.
- Must be either \%\f3GLU_MAP1_TRIM_2\fP or \%\f3GLU_MAP1_TRIM_3\fP.
- .SH DESCRIPTION
- \%\f3gluPwlCurve\fP 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.
- .P
- If \f2type\fP is
- \%\f3GLU_MAP1_TRIM_2\fP, then it describes a curve in two-dimensional (\f2u\fP
- and \f2v\fP) parameter space. If it is \%\f3GLU_MAP1_TRIM_3\fP, then it
- describes a curve in two-dimensional homogeneous (\f2u\fP, \f2v\fP,
- and \f2w\fP) parameter space.
- See the \%\f3gluBeginTrim\fP reference page for more information
- about trimming curves.
- .SH NOTES
- To describe a trim curve that closely follows the contours of a NURBS
- surface, call \%\f3gluNurbsCurve\fP.
- .SH SEE ALSO
- \%\f3gluBeginCurve(3G)\fP, \%\f3gluBeginTrim(3G)\fP, \%\f3gluNewNurbsRenderer(3G)\fP, \%\f3gluNurbsCurve(3G)\fP
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