GLUBEGINSURFACE() GLUBEGINSURFACE() NAME gluBeginSurface, gluEndSurface - delimit a NURBS surface definition C SPECIFICATION void gluBeginSurface( GLUnurbs* nurb ) void gluEndSurface( GLUnurbs* nurb ) delim $$ PARAMETERS nurb Specifies the NURBS object (created with gluNewNurbsRenderer). DESCRIPTION Use gluBeginSurface to mark the beginning of a NURBS surface definition. After calling gluBeginSurface, make one or more calls to gluNurbsSurface to define the attributes of the surface. Exactly one of these calls to gluNurbsSurface must have a surface type of GL_MAP2_VERTEX_3 or GL_MAP2_VERTEX_4. To mark the end of the NURBS surface definition, call gluEndSurface. Trimming of NURBS surfaces is supported with gluBeginTrim, gluPwlCurve, gluNurbsCurve, and gluEndTrim. See the gluBeginTrim reference page for de- tails. GL evaluators are used to render the NURBS surface as a set of polygons. Evaluator state is preserved during rendering with glPushAt- trib(GL_EVAL_BIT) and glPopAttrib(). See the glPushAttrib reference page for details on exactly what state these calls preserve. EXAMPLE The following commands render a textured NURBS surface with normals; the texture coordinates and normals are also described as NURBS surfaces: gluBeginSurface(nobj); gluNurbsSurface(nobj, ..., GL_MAP2_TEXTURE_COORD_2); gluNurbsSurface(nobj, ..., GL_MAP2_NORMAL); gluNurbsSurface(nobj, ..., GL_MAP2_VERTEX_4); gluEndSurface(nobj); SEE ALSO gluBeginCurve, gluBeginTrim, gluNewNurbsRenderer, gluNurbsCurve, gluNurb- sSurface, gluPwlCurve GLUBEGINSURFACE()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | EXAMPLE | SEE ALSO
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