Added environmental variable for setting the height of the drive manipulator.
Added environmental variable for setting the height of the drive manipulator.


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