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