HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 411

T gluTessBeginPolygon gluTessBeginPolygon gluTessBeginPolygon: delimit a polygon description. C Specification void gluTessBeginPolygon( GLUtesselator* tess, GLvoid* data) Parameters tess data Specifies the tessellation object (created with gluNewTess). Specifies a pointer to user polygon data. Description gluTessBeginPolygon and gluTessEndPolygon delimit the definition of a non-convex polygon. Within each gluTessBeginPolygon/gluTessEndPolygon pair, there must be one or more calls to gluTessBeginContour/gluTessEndContour. Within each contour, there are zero or more calls to gluTessVertex. The vertices specify a closed contour (the last vertex of each contour is automatically linked to the first). See the gluTessVertex, gluTessBeginContour, and gluTessEndContour reference pages for more details. data is a pointer to a user-defined data structure. If the appropriate callback(s) are specified (see gluTessCallback), then this pointer is returned to the callback function(s). Thus, it is a convenient way to store per-polygon information. Once gluTessEndPolygon is called, the polygon is tessellated, and the resulting triangles are described through callbacks. See gluTessCallback for descriptions of the callback functions. See Also gluNewTess, gluTessBeginContour, gluTessVertex, gluTessCallback, gluTessProperty, gluTessNormal gluTessEndPolygon Chapter 18 411