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GLULOADSAMPLINGMATRICES(3gl)			  GLULOADSAMPLINGMATRICES(3gl)

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 gluNewNurbsRen‐
		    derer).

       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_TOL‐
       ERANCE  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 con‐
       venient 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, projec‐
       tion matrix, and viewport.)

SEE ALSO
       gluGetNurbsProperty, gluNewNurbsRenderer, gluNurbsProperty

				   15 Mar 97	  GLULOADSAMPLINGMATRICES(3gl)
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