Fixed possible divide by zero
Fixed possible divide by zero

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