Added range of camera manipulators and a center of screen test intersection that is insticated by pressing 'c' key
Added range of camera manipulators and a center of screen test intersection that
is insticated by pressing 'c' key


artoolkit/osg,scrawl/osg,artoolkit/osg,tomasthoresen/osg,openscenegraph/osg,scrawl/osg,marchelbling/osg,jtorresfabra/osg,tomasthoresen/osg,jtorresfabra/osg,openscenegraph/osg,marchelbling/osg,tomasthoresen/osg,jtorresfabra/osg,marchelbling/osg,tomasthoresen/osg,openscenegraph/osg,artoolkit/osg,jtorresfabra/osg,marchelbling/osg,scrawl/osg,artoolkit/osg,scrawl/osg,openscenegraph/osg