Robert Osfield wrote:
Hi Hannes,
On Fri, Aug 29, 2008 at 8:27 PM, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
someone from the project came up with this question:
"the project" being?? Your own project?
http://sourceforge.net/projects/csp
http://csp.sourceforge.net/
The Combat Simulator Project
I think this demo never became part of OSG, which is also what Robert
states in his response to your question. Anyway, I don't get what
exactly he's talking about in terms of the relationship between
ChunkedLOD and osgDB::DatabasePager. The chunking aspect in
ChunkedLOD refers to the fact the rendering algorithm divides the
terrain mesh into individual chunks that can be sent to the gfx
adapter separately, eliminating the need to re-build the whole mesh
every time the camera perspective changes. In my understanding,
osgDB::DatabasePager is used to load terrain tiles in a background
thread, but is not directly to the actual rendering operations.
DatabasePager only does loading of subgraps in a background thread,
incremental compiling of OpenGL objects, merge of new subgraphs and
deleting of expired subgraphs. This is not equivalent to ChunkedLOD,
rather just one component of such as system, although I'd guess
DatabasePager is far more capable than most paging systems that you'll
find on ChunkedLOD implementations.
The division of the database up is pre-processing step that is done by
VirtualPlanetBuilder, which builds a hierarchical tiled database. VTP
is extremely scalable and can terrabyte geospatial whole earth
databases. All the databases generated by VTB are viewable in OSG
applications, with the DatabasePager managing the paging automatically
for you, and either standard osg::Geometry/osg::StateSet/osg::Node
subgraphs or osgTerrain based subgraphs handling the scene
representation and rendering. VTB is the only source tool of its
kind as far as I'm aware.
Put osgDB::DatabasePager and VTP generated databases together and you
have something that is far more scalable and capable than a ChunkedLOD
implementation.
Robert.
originally someone did a test with photo realistic terrain.
video (40s):
High resolution (26 Mo) http://documents.cigognes.net/csp/csp-terrain-photo.avi
Low resolution (YouTube) http://fr.youtube.com/watch?v=1NlZoylXrlo
we are a little bit confused.
http://csp.sourceforge.net/forum/viewtopic.php?p=4616#4616
is http://www.openscenegraph.org/projects/osg/wiki/Support/UserGuides/osgdem
what you mean or are we on the wrong way?
with VirtualPlanetBuilder you mean
http://www.openscenegraph.org/projects/VirtualPlanetBuilder
with VTP you mean http://www.vterrain.org/
i did not find anything about VTB, is it a mistyped VTP?
thanks for your help in our confusion.
best regards
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