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

[Paul Fishwick]

Could OAR be generalized to include scene graphs with meshes? That would
be really nice as it would create two things not currently supported: 
hierarchical
scene graphs and triangular mesh. If an importer is written to opensim, 
then it is
a matter of coaxing the viewer to render these.. In your list of 
options, you might
also consider the indexedfaceset of X3D for the mesh (X3D also supports 
a true
scene graph).
-p


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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