Hartwig, By "coordinate systems" do you mean different spatial reference systems (SRS), e.g. UTM vs. mercator? If so, then the answer is probably no - there isn't a good way to do this at run time for arbitrary SRS pairs. Not only is the math CPU-intensive, but the two SRS's may have different domains that make consistent transformation impossible.
The best approach is really to store the database in each SRS, and just convert between individual coordinates at run time (like for picking or object placement, for example). You said you can't do that because the amount of data is too large ... can you elaborate? Too large to fit on disk? In memory? Glenn Waldron : Pelican Mapping : http://pelicanmapping.com : +1.703.652.4791 On Fri, Dec 4, 2009 at 3:57 PM, Hartwig Wiesmann < hartwig.wiesm...@wanadoo.nl> wrote: > Hi, > > I am looking for a recommendation how to implement best the following > problem using OSG: > > assume that I have terrain data in a (paged) LOD using a specific > coordinate system. > Now, I want to visualize the same terrain data that is stored in coordinate > system "A" in coordinate system "B" or by using a special projection. What > is the recommended way of doing this? > > Some further information: > > - I cannot store the same data in a couple of (paged) LOD databases as the > amount of data is too large. > - The LOD element selection does not have to be perfect (if it is difficult > to implement or too time consuming for visualization). The LOD element > selection could still be done on the original coordinate system but the > visualization of the data has to be in the "other" coordinate system or > projection. > - I cannot change the database each time I would like to use a different > coordinate system for visualization - even if it is a "fast" process - as > two windows might visualize the same data but with different coordinate > systems. > > > Any ideas how to implement this? Perhaps I have overseen something very > trivial as I am new to OSG. > > Thank you! > > Cheers, > Hartwig > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=20929#20929 > > > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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