70 lines
2.0 KiB
Plaintext
70 lines
2.0 KiB
Plaintext
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'\" e
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'\"! eqn | mmdoc
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'\"macro stdmacro
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.ds Vn Version 1.2
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.ds Dt 6 March 1997
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.ds Re Release 1.2.0
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.ds Dp May 02 11:53
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.ds Dm 37 pwlcurve.
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.ds Xs 35475 4 pwlcurve.gl
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.TH GLUPWLCURVE 3G
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.SH NAME
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.B "gluPwlCurve
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\- describe a piecewise linear NURBS trimming curve
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.SH C SPECIFICATION
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void \f3gluPwlCurve\fP(
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GLUnurbs* \fInurb\fP,
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.nf
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.ta \w'\f3void \fPgluPwlCurve( 'u
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GLint \fIcount\fP,
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GLfloat* \fIdata\fP,
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GLint \fIstride\fP,
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GLenum \fItype\fP )
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.fi
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.EQ
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delim $$
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.EN
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.SH PARAMETERS
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.TP \w'\fIstride\fP\ \ 'u
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\f2nurb\fP
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Specifies the NURBS object (created with \%\f3gluNewNurbsRenderer\fP).
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.TP
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\f2count\fP
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Specifies the number of points on the curve.
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.TP
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\f2data\fP
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Specifies an array containing the curve points.
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.TP
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\f2stride\fP
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Specifies the offset (a number of single-precision floating-point values)
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between points on the curve.
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.TP
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\f2type\fP
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Specifies the type of curve.
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Must be either \%\f3GLU_MAP1_TRIM_2\fP or \%\f3GLU_MAP1_TRIM_3\fP.
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.SH DESCRIPTION
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\%\f3gluPwlCurve\fP describes a piecewise linear trimming curve for a NURBS surface.
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A piecewise linear curve consists of a list of
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coordinates of points in the parameter space for the
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NURBS surface to be trimmed. These points are connected
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with line segments to form a curve. If the curve is
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an approximation to a curve that is not piecewise linear,
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the points should be close enough in parameter space that the
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resulting path appears curved at the resolution used in the application.
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.P
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If \f2type\fP is
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\%\f3GLU_MAP1_TRIM_2\fP, then it describes a curve in two-dimensional (\f2u\fP
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and \f2v\fP) parameter space. If it is \%\f3GLU_MAP1_TRIM_3\fP, then it
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describes a curve in two-dimensional homogeneous (\f2u\fP, \f2v\fP,
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and \f2w\fP) parameter space.
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See the \%\f3gluBeginTrim\fP reference page for more information
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about trimming curves.
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.SH NOTES
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To describe a trim curve that closely follows the contours of a NURBS
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surface, call \%\f3gluNurbsCurve\fP.
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.SH SEE ALSO
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\%\f3gluBeginCurve(3G)\fP, \%\f3gluBeginTrim(3G)\fP, \%\f3gluNewNurbsRenderer(3G)\fP, \%\f3gluNurbsCurve(3G)\fP
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