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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 defini- tion. After calling gluBeginSurface, make one or more calls to gluNurb- sSurface 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 details. GL evaluators are used to render the NURBS surface as a set of poly- gons. 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 sur- faces: 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, gluNurbsSurface, gluPwlCurve GLUBEGINSURFACE()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | EXAMPLE | SEE ALSO
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