gluLoadSamplingMatrices()               gluLoadSamplingMatrices()

NAME    [Toc]    [Back]

       gluLoadSamplingMatrices  - load NURBS sampling and culling
       matrices

SYNOPSIS    [Toc]    [Back]

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

PARAMETERS    [Toc]    [Back]

       Specifies the NURBS object (created  with  gluNewNurbsRenderer()).
   Specifies 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).

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



                                        gluLoadSamplingMatrices()