<area shape="rect" href="$a01480.html" title="abstract specification for renderers" alt="" coords="31,229,127,256"> <area shape="rect" href="$a01833.html" title="abstract specification for Viewports" alt="" coords="32,155,125,181"> <area shape="rect" href="$a01084.html" title="abstract base class for most VTK objects" alt="" coords="39,80,119,107"> <area shape="rect" href="$a01085.html" title="abstract base class for most VTK objects" alt="" coords="24,5,133,32">