How to import from blender

Hello,
My purpose is to make a planetarium. I want the user to see stars and to click on a star to select it and get informations.
I made a 3D scene with blender and python scripting: I made 500 white filled circles around a sphere (the 500 stars are at the good position, facing the center). The light and the camera are in the center of the scene. I can render it in Blender.

Next, I need to import the objects in my Urho3D project.

These are few questions :

1. the Blender Urho3D addon seems not to work with Blender 2.8. Right?
   I need to use Assetimport to convert my scene.
2. Can I convert a full node with all the circles in it. assimp does not propose me Urho3D export command. How should I do? Is there any step by step documentation?
3. what should I get? a xml file? 500 xml files? a mdl file?

I made python scripting in blender to draw the sky.
4. would it be a better (faster or easier) solution to draw the sky in urho editor with angelscript?

Thank you for your help and your advices

reattiva’s exporter has a branch named 2_80. Clone the repo and switch to that branch (or just visit that link, and choose download ZIP, then follow the README instructions to install the addon in Blender) . The exporter worked the last time I tried it with Blender 2.8.

There’s also AssetImporter.exe if you build it with Urho3D, where you can pass it a collada file or a blend (?) and get an mdl + Textures, animations, etc.

Great, it works!
So I exported 7 selected circles as 7 .mdl files. (I can’t attach any picture at this time
Is it possible to export one mdl file with all the 500 circles as children nodes?
Will the user be able, from a urho3d project, to select one circle among the 500 circles mdl unic file?

So I ticked the “Merge objects” box and exported a 134 Ko .mdl file. I guess I made it.
I will try to render it in a urho3d project and see if the user can select one circle and if I can get the name of the object clicked…

The exporter also has the option to export an XML scene file, which may be useful.

Thank you for your answers.
I was able to see my model in a urho3D project. But I can’t see the Materials (the color of the disks).
I tried to export the materials but I get this error:

Traceback (most recent call last):
File “C:\Users\pierre-louis\AppData\Roaming\Blender Foundation\Blender\2.81\scripts\addons\Urho3D-Blender-2_80_init_.py”, line 937, in invoke
return self.execute(context)
File “C:\Users\pierre-louis\AppData\Roaming\Blender Foundation\Blender\2.81\scripts\addons\Urho3D-Blender-2_80_init_.py”, line 933, in execute
ExecuteAddon(context)
File “C:\Users\pierre-louis\AppData\Roaming\Blender Foundation\Blender\2.81\scripts\addons\Urho3D-Blender-2_80_init_.py”, line 1600, in ExecuteAddon
ExecuteUrhoExport(context)
File “C:\Users\pierre-louis\AppData\Roaming\Blender Foundation\Blender\2.81\scripts\addons\Urho3D-Blender-2_80_init_.py”, line 1473, in ExecuteUrhoExport
Scan(context, tDataList, settings.errorsMem, tOptions)
File “C:\Users\pierre-louis\AppData\Roaming\Blender Foundation\Blender\2.81\scripts\addons\Urho3D-Blender-2_80\decompose.py”, line 2500, in Scan
DecomposeMesh(scene, obj, tData, tOptions, errorsMem)
File “C:\Users\pierre-louis\AppData\Roaming\Blender Foundation\Blender\2.81\scripts\addons\Urho3D-Blender-2_80\decompose.py”, line 1938, in DecomposeMesh
DecomposeMaterial(mesh, material, tMaterial)
File “C:\Users\pierre-louis\AppData\Roaming\Blender Foundation\Blender\2.81\scripts\addons\Urho3D-Blender-2_80\decompose.py”, line 1724, in DecomposeMaterial
tMaterial.twoSided = mesh.show_double_sided
AttributeError: ‘Mesh’ object has no attribute ‘show_double_sided’

Exporting materials from Blender 2.8 not implemented yet, becouse in Blender 2.8 internal rederer was removed. You can still use Blender 2.7. Currently I am experimenting with convertig Urho’s shaders to Cycles one to one (Unlit and Solid) but I can’t say when I public something

Urho blender 2.81858×1080 447 KB

@1vanK no worries, there is no hurry.
I guess I can add materials in my urho project, after I have imported the model or in urho editor…

Some progress

UPD:
https://github.com/1vanK/Urho3D-Blender/tree/2_80
data.blend + textures for testing

It is a surprise for me, but custom shaders work not only in Cycle, but also in Eevee