Added sphere segment to osgsimulator.
Added sphere segment to osgsimulator.


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