Manpage of glutRemoveLayer
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glutRemoveOverlay - removes the overlay (if one exists) from the current window.
glutRemoveOverlay removes the overlay (if one exists). It is safe
to call glutRemoveOverlay even if no overlay is currently
established--it does nothing in this case. Implicitly, the window's
layer in use changes to the normal plane immediately once the
overlay is removed.
If the program intends to re-establish the overlay later, it is typically
faster and less resource intensive to use glutHideOverlay and
glutShowOverlay to simply change the display status of the
Mark J. Kilgard (email@example.com)
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Time: 13:00:48 GMT, March 25, 2001