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SuSE 11.3 - man page for gluloadsamplingmatrices (suse section 3G)

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GLULOADSAMPLINGMATRICES(3G)					      GLULOADSAMPLINGMATRICES(3G)

NAME
       gluLoadSamplingMatrices - load NURBS sampling and culling matrices

C SPECIFICATION
       void gluLoadSamplingMatrices( GLUnurbs* nurb,
				     const GLfloat *model,
				     const GLfloat *perspective,
				     const GLint *view )

PARAMETERS
       nurb	    Specifies the NURBS object (created with gluNewNurbsRenderer).

       model	    Specifies a modelview matrix (as from a glGetFloatv call).

       perspective  Specifies a projection matrix (as from a glGetFloatv call).

       view	    Specifies a viewport (as from a glGetIntegerv call).

DESCRIPTION
       gluLoadSamplingMatrices	uses  model,  perspective, and view to recompute the sampling and
       culling matrices stored in nurb.  The sampling matrix determines how finely a NURBS  curve
       or  surface  must  be  tessellated to satisfy the sampling tolerance (as determined by the
       GLU_SAMPLING_TOLERANCE property).  The culling matrix is used in deciding if a NURBS curve
       or surface should be culled before rendering (when the GLU_CULLING property is turned on).

       gluLoadSamplingMatrices	is  necessary only if the GLU_AUTO_LOAD_MATRIX property is turned
       off  (see   gluNurbsProperty).	 Although   it	 can   be   convenient	 to   leave   the
       GLU_AUTO_LOAD_MATRIX  property turned on, there can be a performance penalty for doing so.
       (A round trip to the GL server is needed to fetch the  current  values  of  the	modelview
       matrix, projection matrix, and viewport.)

SEE ALSO
       gluGetNurbsProperty(3G), gluNewNurbsRenderer(3G), gluNurbsProperty(3G)

								      GLULOADSAMPLINGMATRICES(3G)
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