gluEndTrim man page on Solaris

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GLUBEGINTRIM(3gl)					     GLUBEGINTRIM(3gl)

NAME
       gluBeginTrim, gluEndTrim - delimit a NURBS trimming loop definition

C SPECIFICATION
       void gluBeginTrim( GLUnurbs* nurb )

       void gluEndTrim( GLUnurbs* nurb )

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

DESCRIPTION
       Use  gluBeginTrim  to  mark  the beginning of a trimming loop, and glu‐
       EndTrim to mark the end of a trimming loop. A trimming loop is a set of
       oriented curve segments (forming a closed curve) that define boundaries
       of a NURBS surface. You include these trimming loops in the  definition
       of a NURBS surface, between calls to gluBeginSurface and gluEndSurface.

       The definition for a NURBS surface can contain many trimming loops. For
       example, if you wrote a definition for a NURBS surface that resembled a
       rectangle  with	a  hole	 punched out, the definition would contain two
       trimming loops. One loop would define the outer edge of the  rectangle;
       the other would define the hole punched out of the rectangle. The defi‐
       nitions of each of these trimming loops would be bracketed by a	gluBe‐
       ginTrim/gluEndTrim pair.

       The definition of a single closed trimming loop can consist of multiple
       curve segments, each described as a piecewise linear curve (see gluPwl‐
       Curve) or as a single NURBS curve (see gluNurbsCurve), or as a combina‐
       tion of both in any order. The only library calls that can appear in  a
       trimming	 loop  definition  (between the calls to gluBeginTrim and glu‐
       EndTrim) are gluPwlCurve and gluNurbsCurve.

       The area of the NURBS surface that is displayed is the  region  in  the
       domain  to  the	left  of  the  trimming	 curve	as the curve parameter
       increases. Thus, the retained region of the NURBS surface is  inside  a
       counterclockwise	 trimming  loop and outside a clockwise trimming loop.
       For the rectangle mentioned earlier, the trimming loop  for  the	 outer
       edge  of	 the  rectangle runs counterclockwise, while the trimming loop
       for the punched-out hole runs clockwise.

       If you use more than one curve to define a single  trimming  loop,  the
       curve  segments	must form a closed loop (that is, the endpoint of each
       curve must be the starting point of the next curve, and the endpoint of
       the  final curve must be the starting point of the first curve). If the
       endpoints of the curve are sufficiently close together but not  exactly
       coincident,  they  will	be coerced to match.  If the endpoints are not
       sufficiently close, an error results (see gluNurbsCallback).

       If a trimming loop definition contains multiple curves,	the  direction
       of  the	curves	must be consistent (that is, the inside must be to the
       left of all of the curves). Nested trimming loops are legal as long  as
       the  curve  orientations	 alternate  correctly.	If trimming curves are
       self-intersecting, or intersect one another, an error results.

       If no trimming information is given for a  NURBS	 surface,  the	entire
       surface is drawn.

EXAMPLE
       This  code fragment defines a trimming loop that consists of one piece‐
       wise linear curve, and two NURBS curves:

       gluBeginTrim(nobj);
	  gluPwlCurve(..., GLU_MAP1_TRIM_2);
	  gluNurbsCurve(..., GLU_MAP1_TRIM_2);
	  gluNurbsCurve(..., GLU_MAP1_TRIM_3);
       gluEndTrim(nobj);

SEE ALSO
       gluBeginSurface, gluNewNurbsRenderer, gluNurbsCallback,	gluNurbsCurve,
       gluPwlCurve

				   15 Mar 97		     GLUBEGINTRIM(3gl)
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