61 lines
1.9 KiB
Plaintext
61 lines
1.9 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 loadsamp
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.ds Xs 25465 4 loadsamplingmatrices.gl
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.TH GLULOADSAMPLINGMATRICES 3G
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.SH NAME
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.B "gluLoadSamplingMatrices
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\- load NURBS sampling and culling matrices
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.SH C SPECIFICATION
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void \f3gluLoadSamplingMatrices\fP(
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GLUnurbs* \fInurb\fP,
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.nf
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.ta \w'\f3void \fPgluLoadSamplingMatrices( 'u
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const GLfloat \fI*model\fP,
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const GLfloat \fI*perspective\fP,
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const GLint \fI*view\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'\fIperspective\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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\f2model\fP
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Specifies a modelview matrix (as from a \f3glGetFloatv\fP call).
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.TP
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\f2perspective\fP
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Specifies a projection matrix (as from a \f3glGetFloatv\fP call).
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.TP
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\f2view\fP
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Specifies a viewport (as from a \f3glGetIntegerv\fP call).
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.SH DESCRIPTION
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\%\f3gluLoadSamplingMatrices\fP uses \f2model\fP, \f2perspective\fP, and \f2view\fP to recompute the sampling and culling
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matrices stored in \f2nurb\fP.
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The sampling matrix determines how finely a NURBS curve or surface
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must be tessellated to satisfy the sampling tolerance (as determined by the
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\%\f3GLU_SAMPLING_TOLERANCE\fP property).
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The culling matrix is used in deciding if a NURBS curve or surface
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should be culled before
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rendering (when the \%\f3GLU_CULLING\fP property is turned on).
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.P
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\%\f3gluLoadSamplingMatrices\fP is necessary only if the \%\f3GLU_AUTO_LOAD_MATRIX\fP property is turned
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off (see \%\f3gluNurbsProperty\fP).
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Although it can be convenient to leave the \%\f3GLU_AUTO_LOAD_MATRIX\fP
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property turned on, there can be a performance penalty for doing so.
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(A round trip to the GL server is needed to fetch the current values
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of the modelview matrix, projection matrix, and viewport.)
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.SH SEE ALSO
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\%\f3gluGetNurbsProperty(3G)\fP,
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\%\f3gluNewNurbsRenderer(3G)\fP,
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\%\f3gluNurbsProperty(3G)\fP
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