gluTessVertex - specify a vertex on a polygon
void gluTessVertex( GLUtesselator *tess, GLdouble coords, void *data )
tess Specifies the tessellation object (created with gluNewTess). coords Specifies the location of the vertex. data Specifies an opaque pointer passed back to the user with the vertex callback (as specified by gluTessCallback).
gluTessVertex describes a vertex on a polygon that the user is defining. Successive gluTessVertex calls describe a closed contour. For example, if the user wants to describe a quadrilateral, then gluTessVertex should be called four times. gluTessVertex can only be called between gluTessBeginContour and gluTessEndContour. data normally points to a structure containing the vertex location, as well as other per-vertex attributes such as color and normal. This pointer is passed back to the user through the GLU_TESS_VERTEX or GLU_TESS_VERTEX_DATA callback after tessellation (see the gluTessCallback reference page).
A quadrilateral with a triangular hole in it can be described as follows: gluTessBeginPolygon(tobj, NULL); gluTessBeginContour(tobj); gluTessVertex(tobj, v1, v1); gluTessVertex(tobj, v2, v2); gluTessVertex(tobj, v3, v3); gluTessVertex(tobj, v4, v4); gluTessEndContour(tobj); gluTessBeginContour(tobj); gluTessVertex(tobj, v5, v5); gluTessVertex(tobj, v6, v6); gluTessVertex(tobj, v7, v7); gluTessEndContour(tobj); gluTessEndPolygon(tobj);
gluTessBeginPolygon, gluNewTess, gluTessBeginContour, gluTessCallback, gluTessProperty, gluTessNormal, gluTessEndPolygon
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Fri Dec 6 11:18:03 EST 1996
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