[osg-users] vpb - libmini - opinion

Cedric Pinson mornifle at plopbyte.net
Sat Sep 13 08:55:38 PDT 2008


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 
>> <mornifle at plopbyte.net> 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
>>>
>>> -- 
>>> +33 (0) 6 63 20 03 56  Cedric Pinson mailto:mornifle at plopbyte.net
>>> http://www.plopbyte.net
>>>
>>>
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>>>
>>>     
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>>   
>

-- 
+33 (0) 6 63 20 03 56  Cedric Pinson mailto:mornifle at plopbyte.net http://www.plopbyte.net





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