gluLoadSamplingMatrices(3G)    OpenGL Reference	   gluLoadSamplingMatrices(3G)

NAME    [Toc]    [Back]

     gluLoadSamplingMatrices - load NURBS sampling and culling matrices

C SPECIFICATION    [Toc]    [Back]

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

PARAMETERS    [Toc]    [Back]

     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    [Toc]    [Back]

     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    [Toc]    [Back]

     gluGetNurbsProperty, gluNewNurbsRenderer, gluNurbsProperty


									PPPPaaaaggggeeee 1111