This is nice but what I'm using this for is something like a Google map. You see it from a high view and it you can close in on an area in the terrain. So I don't mind using the full range of level of detail.
I was under the impression that you had to set the level of detail get the most detail from the data, but if VPB does that all the better for me. I would just like to understand this because I also have to explain how this works if anyone is going to have any confidence in the data it makes. That is why I'm doing the paper on it! The only other thing was that we had to make a tool that changed the range mode on the PagedLOD node from distance to Pixel Size on Screen. As far as I could tell there was no command setting for this in VPB. We also did a pruning tool that allows us to cut back LOD on all but a given areas of the terrain. The sole reason is there are some areas on the terrain that require higher levels of detail than others so we can prune all but these areas down to a lower detail. This cuts down on the massive size of the terrain that makes it difficult to transport to other systems. Basically if we don't use the prune tool, a chunk of terrain can take up about 58 gigs of hard drive disk space on an average. But after using the prune tool, the same terrain is shunk down to a disk footprint of only 8 Gigs without any real loss of data - given that the data that is pruned out is redundant. This makes the terrain more practical to distribute. It's a little pricy from a logistical standpoint to be handing out USB bricks when compared to handing out a double layered DVD. D Glenn declic creation wrote: > Yes, I think so.There is also this command which may be interesting for you : > --levels <begin_level> <end_level> Specify the range of levels that the > next source Texture or DEM will contribute to. > > > http://www.openscenegraph.org/projects/VirtualPlanetBuilder/wiki/CommandLineOptions > > (http://www.openscenegraph.org/projects/VirtualPlanetBuilder/wiki/CommandLineOptions) > > > > > > > > > -- > Christophe > > > 2012/10/31 David Glenn < ()> > > > O.K. Then the -l command sets the limit of the LOD you can have and not > > how many LOD's your terrain is going to have! By default it maxes out at 30 > > and the only reason to use it is to limit the LOD's (and detail) of your > > terrain, Right? > > > > D Glenn > > > > > > declic creation wrote: > > > > > Hi David, > > > > > > If osgdem get to the level where the texture resolution is the highest it > > > stops, even if it's before the max number of levels you specified. > > > So L11 might be the last level with the highest resolution texture for > > > your database. > > > > > > > > > -- > > > Christophe > > > > > > > > > > > > > > > > 2012/10/30 David Glenn < ()> > > > > > > > > > > > > > > robertosfield wrote: > > > > > > > > > > > > > Hi David, > > > > > > > > > > I can't recall all the options off the top of my head so with the help > > > > > of osgdem --help and grep I get: > > > > > > > > > > $ osgdem --help | grep LOD > > > > > --LOD Create a LOD'd database. > > > > > --PagedLOD Create a PagedLOD'd database. > > > > > --subtile <LOD> <X> <Y> > > > > > -l <numOfLevels> Specify the number of PagedLOD levels to generate. > > > > > > > > > > So the last one is the one you want, so just add a -l 5 or something > > > > > similar to your osgdem or vpbmaster command line. > > > > > > > > > > Robert. > > > > > > > > > > > > > > > > > > > > On 5 September 2012 23:44, David Glenn <> wrote: > > > > > > > > > > > > > > > > > > > > > Greetings All! > > > > > > > > > > > > I'm just getting the time to do some real study on VPB and I had > > > > > > some questions about LOD and controlling it! > > > > > > > > > > > > First of all, I'm going to reverence a tool that I know “Terra > > > > > > Vista” for an example. If you don't know about this tool, I > > > > > > understand and try to explain in more detail. > > > > > > > > > > > > One of the tricks you can do in Terra Vista is that you can limit > > > > > > the amount of LOD's you can use in a given area over others. This > > > > > > allows you to build terrain that has higher level of detail in some > > > > > > areas (where it matters ) and allows other areas to max out at a > > > > > > lower level of detail. This in the end would make the terrain take > > > > > > up less space than of all of the terrain was at a high level of > > > > > > detail. > > > > > > > > > > > > I managed to get a group of satellite data at 1 meter resolution > > > > > > and it works fine, but it's taking up over 50 gigs of Hard disk > > > > > > space. I like to cut it back a bit so I can at lease maybe get it > > > > > > on a double layer DVD, if not , a blue ray disk. I figure that if > > > > > > I can cut back on the resolution in areas that I don’t need to be > > > > > > at 1 meter resolution, I can cut the size in whole of the terrain > > > > > > to something more manageable. > > > > > > > > > > > > Dglenn > > > > > > > > > > > > ------------------------ > > > > > > David Glenn > > > > > > --------------- > > > > > > D Glenn 3D Computer Graphics & Media Systems. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > www.dglenn.com (http://www.dglenn.com) (http://www.dglenn.com > > > > > > (http://www.dglenn.com)) > > > > > > > > > > > > ------------------ > > > > > > Read this topic online here: > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > http://forum.openscenegraph.org/viewtopic.php?p=49791#49791 > > > > > > (http://forum.openscenegraph.org/viewtopic.php?p=49791#49791) > > > > > > (http://forum.openscenegraph.org/viewtopic.php?p=49791#49791 > > > > > > (http://forum.openscenegraph.org/viewtopic.php?p=49791#49791)) > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > > osg-users mailing list > > > > > > > > > > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > > > > > > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org) > > > > > > > > > > > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > > > > > > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org)) > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > osg-users mailing list > > > > > > > > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > > > > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org) > > > > > > > > > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > > > > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org)) > > > > > > > > > > ------------------ > > > > > Post generated by Mail2Forum > > > > > > > > > > > > > > > > > > > > > > Well, I have made some headway on Paged LOD's and made some terrains > > > > files, but I also found something interesting and I was wondering is > > > > someone can explain this to me! > > > > > > > > When I make a terrain with -l set to 20, I get a bunch of files titled > > > > with the name, level of detail number, the X location in the grid and a > > > > Y location on the grid fallowed with "_subtile"! I figured that I would > > > > find at least 19 sets of files listed from L0 up to L19 or L20 but what > > > > I get is 12 sets listed from L0 to L11. Can anyone explain this to me? > > > > I'm in the middle of writing a paper on this and after reviewing code > > > > and files, I thought I knew what was going on, but now I'm confused!! > > > > :? > > > > > > > > ------------------------ > > > > David Glenn > > > > --------------- > > > > D Glenn 3D Computer Graphics & Media Systems. > > > > > > > > > > > > > > > > > > www.dglenn.com (http://www.dglenn.com) (http://www.dglenn.com > > > > (http://www.dglenn.com)) > > > > > > > > ------------------ > > > > Read this topic online here: > > > > > > > > > > > > > > > > > > http://forum.openscenegraph.org/viewtopic.php?p=50901#50901 > > > > (http://forum.openscenegraph.org/viewtopic.php?p=50901#50901) > > > > (http://forum.openscenegraph.org/viewtopic.php?p=50901#50901 > > > > (http://forum.openscenegraph.org/viewtopic.php?p=50901#50901)) > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > osg-users mailing list > > > > () > > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org) > > > > > > > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org)) > > > > > > > > > > > > > > > > > ------------------ > > > Post generated by Mail2Forum > > > > > > > > > > > ------------------------ > > David Glenn > > --------------- > > D Glenn 3D Computer Graphics & Media Systems. > > www.dglenn.com (http://www.dglenn.com) > > > > ------------------ > > Read this topic online here: > > > > http://forum.openscenegraph.org/viewtopic.php?p=50922#50922 > > (http://forum.openscenegraph.org/viewtopic.php?p=50922#50922) > > > > > > > > > > > > _______________________________________________ > > osg-users mailing list > > () > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org) > > > > > > > > > ------------------ > Post generated by Mail2Forum ------------------------ David Glenn --------------- D Glenn 3D Computer Graphics & Media Systems. www.dglenn.com ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=50927#50927 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
