gluNurbsCallbackData — set a user data pointer
Specifies the NURBS object (created with gluNewNurbsRenderer).
Specifies a pointer to the user's data.
gluNurbsCallbackData is used to pass a pointer to the application's data to NURBS
tessellator. A copy of this pointer will be passed by the tessellator
in the NURBS callback functions (set by gluNurbsCallback).
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