Hi, On Fri, 2009-11-06 at 17:34 -0200, Thiago Bastos wrote: > Hi Gerrit, > > Thanks for your reply! > > On 05/11/2009, at 23:20, Gerrit Voß wrote: > > >> Something in the likes of Google Earth, NASA World Wind, etc. -- with > >> CLOD, hierarchical tiling, on-demand loading of imagery and elevation > >> data (ideally from a map server), etc? > > > > I have a sample implementation for hierarchical tiling, it is > > basically > > a quadtree hierarchy. It is not quite finished yet as for the direct > > disk to gpu transfer it needed some infrastructure in OpenSG which > > is finally done ;), so I see that I can update and finish it. > > > > One problem is that it currently depends on my tree and addon stuff > > > > http://github.com/vossg , the treegv and addongv. > > > > I plan to merge treegv back into the main tree but I have to sort > > out gdal support first. > > I am not sure about what you got in treeGV, but some things in > OSGAddOnsGV seem pretty interesting. > Are you planning to merge OSGContribLabeling back into the main tree > anytime soon? I assume it depends on treeGV, right?
this one IIRC not, but it has some global static caches I want to look at first. > >> I've done some research and found a handful of interesting projects, > >> but unfortunately most of them have gone the OpenSceneGraph way. > >> > >> 1) osgEarth - http://wush.net/trac/osgearth/ > >> This is exactly what I'd like to have, but unfortunately it's made > >> specifically for OpenSceneGraph. > >> > >> 2) ossimPlanet - http://www.ossim.org/OSSIM/ossimPlanet.html > >> Similar to osgEarth (although it seems like a bigger project), and > >> also based on OpenSceneGraph. > >> > >> These first two are able to incrementally load data from open map > >> servers (WMS). If you don't need a WMS, there's a third option: > >> > >> 3) Virtual Terrain Project - http://www.vterrain.org/ > >> Not exactly what I need, but seems like a good starting point. > >> Technically it is scene-graph independent, but then again, the > >> OpenSceneGraph integration is well maintained, unlike the OpenSG > >> integration (unfortunately). > > > > I started looking into it at one point and have a rough idea how this > > one works. If urgently needed I could pick it up again. IIRC I got > > the basics working with OpenSG2 > > By "this one", do you mean WMS or VTerrain? VTerrain. > WMS support is not really necessary for us, but somehow we must be > able to load tons of terrain data incrementally from a data server. > I'm not sure if VTerrain supports the concept of a data server, but it > seems like libMini does, and its solution is simple and efficient (to > load, not as much to generate). > > >> Finally, as a last resort, there's libMini -- one interesting OpenGL- > >> only terrain-rendering library: > >> > >> 4) libMini - http://stereofx.org/terrain.html > >> I guess it wouldn't be too difficult to create a custom Node for > >> wrapping libMini... > > > > I should have this lying around somewhere I'll check in which > > state it is and push it to my addon tree if it is in reasonable > > shape. > > Wow, do you mean you have (or had) a working libMini integration for > OpenSG? > That would be awesome :-) yes, I found it, but it is very simple (e.g. a callback algorithm stage). Give me a little to check if it still works. I put it back into the main contrib and add libMini to the support libs. > > Final question, as this is quite a wide topic, could you narrow > > down a little what you are looking for, e.g. something like Google > > Earth with has to deal with the whole planet and wrap arounds or > > more a localized area ? > > Well, our ultimate goal is to visualize the whole Earth. As a start > we'd probably use a smaller dataset, such as NASA's Blue Marble (1km > per pixel), which I guess is fairly feasible with libMini. Then later > on we'd see how to handle more detailed imagery (<15m per pixel, or > 30m for elevation data), as I guess that'd be too painful to handle > with libMini's data model. ok. We did quite some work on parallel disk to gpu loading recently so this should help. I'll try to finish the AddOn BlockBaseQuadTree terrain as an example. Not sure if this is the best approach but it should be a good example. kind regards gerrit ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Opensg-users mailing list Opensg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/opensg-users
