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tqt3/examples/opengl/overlay/overlay.doc

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/*! \page opengl-overlay-example.html
\ingroup opengl-examples
\title OpenGL Overlay Example
This example demonstrates how to use OpenGL overlays with the Qt OpenGL
Extension. It features a QGLWidget with a relatively expensive redrawing
operation, and rubber-band drawing in the overlay plane. Using the
overlay has the advantage that the rubber-band may be drawn and erased
without damaging the image in the main plane, so costly redraws are
avoided.
See \c{$QTDIR/examples/opengl/overlay} for the source code.
*/