Added near/far compute.
Added near/far compute.


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