Added handling of potential zero divisor
Added handling of potential zero divisor

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