glugetnurbsproperty(3g) [xfree86 man page]

GLUGETNURBSPROPERTY(3G) 												   GLUGETNURBSPROPERTY(3G)

NAME

       gluGetNurbsProperty - get a NURBS property

C SPECIFICATION

       void gluGetNurbsProperty( GLUnurbs* nurb,
				 GLenum property,
				 GLfloat* data )

PARAMETERS

       nurb	 Specifies the NURBS object (created with gluNewNurbsRenderer).

       property  Specifies  the  property  whose  value  is to be fetched. Valid values are GLU_CULLING, GLU_SAMPLING_TOLERANCE, GLU_DISPLAY_MODE,
		 GLU_AUTO_LOAD_MATRIX, GLU_PARAMETRIC_TOLERANCE, GLU_SAMPLING_METHOD, GLU_U_STEP, GLU_V_STEP and GLU_NURBS_MODE.

       data	 Specifies a pointer to the location into which the value of the named property is written.

DESCRIPTION

       gluGetNurbsProperty retrieves properties stored in a NURBS object. These properties affect the way that NURBS curves and surfaces are  ren-
       dered. See the gluNurbsProperty reference page for information about what the properties are and what they do.

SEE ALSO

       gluNewNurbsRenderer(3G), gluNurbsProperty(3G)

															   GLUGETNURBSPROPERTY(3G)

GLULOADSAMPLINGMATRICES(3G)											       GLULOADSAMPLINGMATRICES(3G)

NAME

       gluLoadSamplingMatrices - load NURBS sampling and culling matrices

C SPECIFICATION

       void gluLoadSamplingMatrices( 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

       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

       gluGetNurbsProperty, gluNewNurbsRenderer, gluNurbsProperty

														       GLULOADSAMPLINGMATRICES(3G)