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gluTessBeginPolygon

Chapter 18

411

gluTessBeginPolygon

gluTessBeginPolygon: delimit a polygon description.

C Speciﬁcation

void gluTessBeginPolygon(

GLUtesselator* tess,

GLvoid* data)

Parameters

tess Speciﬁes the tessellation object (created with gluNewTess).

data 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.

HP b2600 Reference Guide

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