gluLoadSamplingMatrices(3G)    OpenGL Reference	   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 OpenGL
     server is needed to fetch the current values of the modelview matrix,
     projection	matrix,	and viewport.)


SEE ALSO
     gluGetNurbsProperty, gluNewNurbsRenderer, gluNurbsProperty














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