Updated stereo documentation to include details about horizontal and vertical split stereo.
Updated stereo documentation to include details about horizontal and vertical
split stereo.


XiaoCC/osg,omega-hub/osg,stmh/osg,ntoand/osg,koshman86/osg,stmh/osg,omega-hub/osg,ghub/osg,koshman86/osg,stmh/osg,koshman86/osg,artoolkit/osg,koshman86/osg,stmh/osg,ntoand/osg,ntoand/osg,omega-hub/osg,XiaoCC/osg,ghub/osg,stmh/osg,ghub/osg,XiaoCC/osg,ghub/osg,ntoand/osg,artoolkit/osg,artoolkit/osg,XiaoCC/osg,omega-hub/osg,XiaoCC/osg,artoolkit/osg