gluLoadSamplingMatrices man page on DigitalUNIX

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gluLoadSamplingMatrices()			     gluLoadSamplingMatrices()

       gluLoadSamplingMatrices - load NURBS sampling and culling matrices

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

       Specifies the NURBS object (created with gluNewNurbsRenderer()).	 Spec‐
       ifies a modelview matrix (as from a glGetFloatv() call).	  Specifies  a
       projection matrix (as from a glGetFloatv() call).  Specifies a viewport
       (as from a glGetIntegerv() call).

       gluLoadSamplingMatrices() uses model, perspective, and view  to	recom‐
       pute  the  sampling  and	 culling matrices stored in nurb. The sampling
       matrix determines how finely a NURBS curve or surface must  be  tessel‐
       lated  to satisfy the sampling tolerance (as determined by the GLU_SAM‐
       PLING_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.)

       gluGetNurbsProperty(3), gluNewNurbsRenderer(3), gluNurbsProperty(3)


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