[Opensim-dev] scene import/export to another app: oar? dotscene? collada?

[Toni Alatalo]

Justin Clark-Casey kirjoitti:
>> I've now been leaning against writing OAR support elsewhere exactly 
>> 'cause it is the internal structure and perhaps awkward for what need 
>>     
> That's theoretically true, but I should think that the old format will still be 
> loadable in some way since changes here would break everybody's existing content
>   

Yah was thinking about the same - I guess there are ways to deal with 
that .. perhaps kind of loosing the initial comfort of automatic 
serialization though, needing manual processing for backwards compat.

> Separate files for objects and assetes were used in order to potentially allow 
> regions to be more easily composed out of world from separate components. 
> Whether this is a good thing or whether there are more advantages to a single 
> monolithic file is, I'm sure, something that could be debated.
>   

Agreed - I think assets in separate files easily make sense, and for 
SL/Opensim like prims too 'cause there is no distinction of the specific 
geom and it's instance(s) in the scene. That said the single file 
Collada .dae files that am working with now seem sensible too.

>> Collada and X3D would be engine independent standards that would
>>     

I built something called 'ColladaDotNet', using the Collada Document 
class from the Collada for XNA project, and have succesfully tested 
using that to read reference Collada scene files, and my own exports 
from Blender.

Am planning to test importing scene info to Opensim / ModRex using that 
.. first just object positions. May test in the Naali viewer (first) too 
.. reading collada files there for local preview (may use with the 
pycollada lib there, have the same test as for ColladaDotNet working now 
with that too).

~Toni

>>> Toni Alatalo wrote:
>>>   
>>>       
>>>> Hi,
>>>>
>>>> I started looking into implementing scene exchange between Opensim and 
>>>> Blender yesterday, and am planning to continue later today. Was reading 
>>>> OARs and the code in OpenSim.Region.Framework.Scenes.Serialization .. 
>>>> where SceneObjectPart #region XML Schema seems to be the fields that are 
>>>> autoserialized by some .net writer, right?
>>>>
>>>> It seems well possible to read and write OAR elsewhere, but I'm not sure 
>>>> if it makes sense, or whether it's more the internal representation in 
>>>> Opensim. Are there any alternatives? With Ogre we've sometimes used the 
>>>> simple DotScene (.scene) made for it, and basically that would cover the 
>>>> info I'm interested in now (positions of meshes in a scene, not prim 
>>>> geom 'cause am not having prims in Blender at least right now anyway). 
>>>> There is an existing DotScene exporter for Blender, would it make sense 
>>>> to write an importer to OpenSim? Or a Collada scene importer perhaps? I 
>>>> haven't looked (yet) what the scene format there looks like. For the 
>>>> Ogre format there is a 15 line complete scene example at 
>>>> http://www.ogre3d.org/wiki/index.php/DotScene
>>>>
>>>> In one way the question is: does OAR loading work with 'partial' data, 
>>>> or would I have to make the exporter write all the fields? Am now 
>>>> looking into exchanging this data first:
>>>> <GroupPosition><X>123</X><Y>129.55</Y><Z>29.340004</Z></GroupPosition>
>>>> <OffsetPosition><X>0</X><Y>0</Y><Z>0</Z></OffsetPosition>
>>>> <RotationOffset><X>0</X><Y>0</Y><Z>0</Z><W>1</W></RotationOffset>
>>>> <Scale><X>17.7774</X><Y>22.8028</Y><Z>69.2987</Z></Scale>
>>>>
>>>> and things like velocity would not apply .. also, are valid region 
>>>> handles, creator-id etc. required, and should I generate GUIDs at export?
>>>>
>>>> I'll experiment what happens at loads of partial data etc., and of 
>>>> course can just make the exporter write all those fields, but hints are 
>>>> welcome so would not be banging my head against the most irrelevant walls.
>>>>
>>>> ~Toni
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>>>>
>>>>   
>>>>     
>>>>         
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