GLULOADSAMPLINGMATRICES(3G)                        GLULOADSAMPLINGMATRICES(3G)



NAME
       gluLoadSamplingatrices - load NURBS sampling and culling matrices


C SPECIFICATION
       void gluLoadSamplingatrices( 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
       gluLoadSamplingatrices 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
       GLUSAMPLINGTOLERANCE property).  The culling matrix is used in decid-
       ing if a NURBS curve or surface should be culled before rendering (when
       the GLUCULING property is turned on).

       gluLoadSamplingatrices is necessary only if  the  GLUAUTOLOADMATRIX
       property is turned off (see gluNurbsProperty).  Although it can be con-
       venient to leave the GLUAUTOLOADMATRIX 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



                                                   GLULOADSAMPLINGMATRICES(3G)