Improves a little bit node graph visitor
Improves a little bit node graph visitor

Adds source geometry and different color from classname

hishamabdelrahman/osgjs,gideonmay/osgjs,hishamabdelrahman/osgjs,jtorresfabra/osgjs,cedricpinson/osgjs,hishamabdelrahman/osgjs,gideonmay/osgjs,jtorresfabra/osgjs,gideonmay/osgjs,cedricpinson/osgjs,jtorresfabra/osgjs,cedricpinson/osgjs