Thanks Robert
i will contact people on vtp
Cedric
Robert Osfield wrote:
Hi Cedric,
I'm not a CLOD expert, so I'd recommend asking some like Ben Discoe,
or others from the VirtualTerrainProject community, as VTP has plenty
of CLOD implementations to choose from so have lots of first hand
experience.
In terms of osgTerrain integration, the part you'd need to implement
would be a custom osgTerrain::TerrainTechnique that build/renders a
single TerrainTile according to the Elevation and Colour Layers
attached to it.
Right now VirtualPlanetBuilder assigns a GeometryTechnique to each
TerrainTile, but at runtime you can replace this with your own
technique via a Registry::ReadCallback that traverses loaded subgraphs
and does the replace. Longer term, possible in the OSG-2.8 time
frame, my plan is to have the osgTerrain::Terrain node, that can be
used to decorate a subgraph containing TerrainTile, to provide the
default TerrainTechnique to use, this way you wouldn't need to have
the ReadCallback, you could just set the terrain technique on the
Terrain, and all its children would then use it.
Robert.
On Sat, Sep 13, 2008 at 4:55 PM, Cedric Pinson <[EMAIL PROTECTED]> wrote:
Hi Robert,
I think to implement a clod technique for osg, i did not check all clod
technique yet. My first candidate to evaluate is libmini. Would you have
some advise about clod technique to use ? Ideally i would like to plug it to
osgTerrain.
Cheers,
Cedric
Cedric Pinson wrote:
Thank you Robert for those informations.
Cedric
Robert Osfield wrote:
Hi Cedric,
VPB/osgTerrain doesn't yet have any blending between LOD levels so
"popping" is still apparent. The effect is less apparent now when
using the --terrain option in VPB, as it creates tiles of higher
resolution so the pixel errors associated with moving between LOD
levels is lower.
W.r.t libmini, the author of this library, Stefan Roettger, was
planning on writing an OSG NodeKit to interface the library with the
OSG. This was last year, but haven't had an update recently from
Stephan so I don't know the status of this work.
With the development of osgTerrain I designed it so we could implement
new TerrainTechnique implementations, just now we just have a crude
brute force GeometryTechnique implementation, but the path is
available to integrate CLOD techniques as custom TerrainTechnique
implementations, this would allow one to integrate external techniques
but reuise the osgTerrain::TerrainTile data structure, so even in
theory allow you to use VPB generated database with a tool like
libmini.
Robert.
On Tue, Aug 19, 2008 at 8:11 PM, Cedric Pinson <[EMAIL PROTECTED]>
wrote:
Hi all,
Is there someone that has already try this library
(http://www.stereofx.org/terrain.html) in production ? On the example it
seems a little slow, i would just want feedback compared to vpb osg.
Then i
have a second question, i did not try a recent version of vpb but i
remember
last time i used it there was some little popup when switching lod
level. Is
there something new to attenuate this effect ?
Then my last question, do you think that it would be useful to use new
algorithms that works with data in live like libmini ? I guess it
depends
the needed of the application, but i would like different opinions
Cheers,
Cedric
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