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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 )

       delim $$

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)

								 March 1, 2011

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