MingWei, It sounds like what you are trying to do it to "drape" the country polygon geometry onto a VPB globe. I assume you are using geocentric whole-earth models. Usually you can drape the polygon geometry to the terrain using an osgSim::OverlayNode. Here is a screenshot showing the technique in action: http://osggis.org/wiki/index.php?title=Image:States2.jpg
However, it only works for areas of limited geographic size. Overlaying a geocentric model onto a geocentric globe using osgSim::OverlayNode doesn't work for projecting models that cover larger areas or the entire earth. Robert may be able to shed some light on why this is the case. In any case, the way to view overlays in osggis_viewer is with the "--overlay" parameter, like this: osggis_viewer terrain.osga --overlay features.osga (Note, I am cross-posting this to the osgGIS mailing list.) -gw On Jan 6, 2008 8:38 PM, MingWei <[EMAIL PROTECTED]> wrote: > Hi! > I am learning about the VirtualPlanetBuilder and osgGIS, both are > necessary for the Geography Infomation system, I want to know how to use > them together, When I use the osggis_viewer application, I cannot find the > right way to display the osgGis models and VPB models together, my data > include global image, dem and the world courtys polygon vector. > > I want to add the vector as a layer, and blend the vector with the > terrain and adjust the transparency. Can I did that using osgGIS? Any one > can tell me the right way. > > Thanks. > > > > > ------------------------------ > 网 易 有 道 词 典 －－ 全 球 最 强 大 的 免 费 英 汉 互 译 词 典 （ 只 有 2 兆 ） > <http://event.mail.163.com/chanel/click.htm?from=NO_25&domain=163> > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- Glenn Waldron : Pelican Mapping : http://pelicanmapping.com : 703-652-4791
_______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
