NAME

gluBeginCurve, gluEndCurve - delimit a NURBS curve definition

C SPECIFICATION

void gglluuBBeeggiinnCCuurrvvee( GLUnurbs* _n_u_r_b )

        

void gglluuEEnnddCCuurrvvee( GLUnurbs* _n_u_r_b )


        

delim $$

PARAMETERS

_n_u_r_b
Specifies the NURBS object (created with gglluuNNeewwNNuurrbbssRReennddeerreerr).

DESCRIPTION

Use gglluuBBeeggiinnCCuurrvvee to mark the beginning of a NURBS curve definition. After calling gglluuBBeeggiinnCCuurrvvee, make one or more calls to gglluuNNuurrbbssCCuurrvvee to define the attributes of the curve. Exactly one of the calls to gglluuNNuurrbbssCCuurrvvee must have a curve type of GGLL__MMAAPP11__VVEERRTTEEXX__33 or GGLL__MMAAPP11__VVEERRTTEEXX__44. To mark the end of the NURBS curve definition, call gglluuEEnnddCCuurrvvee.

GL evaluators are used to render the NURBS curve as a series of line segments. Evaluator state is preserved during rendering with ggllPPuusshhAAttttrriibb(GGLL__EEVVAALL__BBIITT) and ggllPPooppAAttttrriibb(). See the ggllPPuusshhAAttttrriibb reference page for details on exactly what state these calls preserve.

EXAMPLE

The following commands render a textured NURBS curve with normals; texture coordinates and normals are also specified as NURBS curves:

gluBeginCurve(nobj); gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2); gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL); gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4); gluEndCurve(nobj);

SEE ALSO

gglluuBBeeggiinnSSuurrffaaccee((33GG)), gglluuBBeeggiinnTTrriimm((33GG)), gglluuNNeewwNNuurrbbssRReennddeerreerr((33GG)), gglluuNNuurrbbssCCuurrvvee((33GG)), ggllPPooppAAttttrriibb((33GG)), ggllPPuusshhAAttttrriibb((33GG))