getnur(3G)

NAME
     getnur - returns the current value of a trimmed NURBS surfaces display
     property

FORTRAN 77 SPECIFICATION
     subroutine getnur
     integer*4 property
     real value

PARAMETERS
     property   expects the name of the property to be queried.

     value      expects variable into which the system should write the value
                of the named property.

DESCRIPTION
     The display of NURBS surfaces can be controlled in different ways.  The
     following is a list of the display properties that can be affected.

     NERRO:    If value is 1.0, some error checking is enabled.  If error
               checking is disabled, the system runs slightly faster.  The
               default value is 0.0.

     NPIXEL:   The value is the maximum length, in pixels, of egdes of
               polygons on the screen used to render trimmed NURBS surfaces.
               The default value is 50.0 pixels.

     An enumeration that dictates the surface rendering
               format; it affects surfaces only.  Possible values are NFILL,
               NOUTPO, and NOUTPA.  NFILL instructs the GL to fill all
               polygons generated in the tessellation of the surface.  NOUTPO
               instructs the GL to outline all polygons generated.  NOUTPA
               instructs the GL to outline the boundary of all surface patches
               and trim curves.

     A Boolean value that, when TRUE, instructs the GL
               to discard before tessellation, all patches that are outside
               the current viewport.

SEE ALSO
     bgnsur, bgntri, nurbsc, nurbss, pwlcur, setnur

NOTE
     This routine is available only in immediate mode.  Nurbs properties are
     on a per window basis.