Victor
Has anyone heard of this particular technique for shading?
https://jose-villegas.github.io/post/deferred_voxel_shading/
I’ve recently stumbled upon it and was thinking it may be a viable solution for GI in Urho that is supported for OpenGL and DirectX (perhaps?). Not sure when I would be able to get around to porting it, although if anyone else has time I think it would be worth it. 
It might also help to use CodeMonkey’s Geometry Shaders for Urho3D.