Added support for OSG_CAMERA_THREADING env variable which is set to "SingleThreaded" will ensure that OsgCameraGroup runs singe threaded.
Added support for OSG_CAMERA_THREADING env variable which is set to
"SingleThreaded" will ensure that OsgCameraGroup runs singe threaded.


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