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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>OpenGL Overlay Example</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>OpenGL Overlay Example</h1>
<p>
This example demonstrates how to use OpenGL overlays with the TQt OpenGL
Extension. It features a <a href="tqglwidget.html">TQGLWidget</a> 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.
<p> See <tt>$TQTDIR/examples/opengl/overlay</tt> for the source code.
<p> <p>See also <a href="opengl-examples.html">OpenGL Examples</a>.
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