void pick(const osgGA::GUIEventAdapter& ea, osgViewer::Viewer* viewer)
{
osgUtil::PolytopeIntersector* picker;
double mx = ea.getXnormalized();
double my = ea.getYnormalized();
double w = 0.05;
double h = 0.05;
picker = new osgUtil::PolytopeIntersector(
osgUtil::Intersector::MODEL, mx-w, my-h, mx+w, my+h );
}
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