Hi Robert,
After compiling OSG svn trunk (linux 64bit), the following commands
worked like charm:
> wget http://www.openscenegraph.org/data/earth_bayarea/bay.path
> osgviewer http://www.openscenegraph.org/data/earth_bayarea/earth.ive
-p bay.path --file-cache MyFileCache
The second time I ran the viewer, it was obvious that the file cache was
being used.
Great features!
/ John
Robert Osfield wrote:
Hi All,
Last night I uploaded a 547Mb paged database to openscenegraph.org.
The .ive files are all generated using zlib compression that is built
into the svn/trunk version of the OSG, you won't be able to load them
with any prior version of the OSG I'm afraid as the compression
support has just been introduced. To view the database you can use:
osgviewer http://www.openscenegraph.org/data/earth_bayarea/earth.ive
The database I generated with the svn/trunk version of
VirtualPlanetBuilder, using options to generate the compressed data,
to use non power of two textures for the highest res tiles, and
disabled mipmapping. These options all work to minimize the tile
sizes which in turn means that the data is better suited for streaming
over http.
The data itself is composed of the Nasa blue marble 1km data, with
high res insert in the bay area of california. You should be able to
find the Don Burn's local hang gliding hill that the osghangglide
example is based on, which in turn was the original inspiration for
the whole OpenSceneGraph odyssey. To help find this little insert
I've uploaded an animation path:
http://www.openscenegraph.org/data/earth_bayarea/bay.path
Grab this then run osgviewer with the path:
osgviewer http://www.openscenegraph.org/data/earth_bayarea/earth.ive
-p bay.path
This will set up an AnimationPathManipulator that zooms you into the
high res insert, and then around the globe. Pressing '4' will take
you to the TerrainManipulator so you can then start exploring
manually, pressing '5' will take you back to the animation path.
The next little thing your can try is to populate a local file cache,
so the next time you load up the data you can pick up on locally cache
files rather than hitting the server.
osgviewer http://www.openscenegraph.org/data/earth_bayarea/earth.ive
--file-cache MyFileCache
Or via an env var:
export OSG_FILE_CACHE = /home/me/Data/MyFileCache # change to
setenv or set for your system...
osgviewer http://www.openscenegraph.org/data/earth_bayarea/earth.ive
Now this dataset is really a tiny one compared to what
VirtualPlanetBuilder is capable of building, one I routinely test
against is 20,000 times bigger, alas the data isn't public so you'll
just have to find your own data and build your databases for such a
Terrabyte database. All the tools are there for you, you just need to
add the data. In terms of runtime need to view the bigger datasets
there are no differences, osgviewer works for all of them equally.
Have fun.
Robert.
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Best regards,
John
WeatherOne
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