gluTessBeginPolygon
Begins a new polygon definition for tessellation using the GLU tessellator. This method starts the specification of a polygon, which will be defined using vertices and may consist of multiple contours. The data
parameter allows attaching custom application-specific data to the polygon, which can be retrieved during callback events.
Parameters
data
Custom application-specific data associated with the polygon. This can be any object, and its use is determined by the application.