How to properly merge the Scenes from multiple trimeshes?

[dmikushin]

I apologize for a possible misunderstanding, the code is very difficult for me to follow.

I've figured out that a trimesh may already return a Scene, if an input file contains multiple meshes.

The Viewer needs a single scene to be viewed, therefore all scenes somehow must be squeezed into one Scene for viewing.

Scene is a Graph containing the hierarchy of geometries.

As far as I can see, the library does not provide an explicit API for merging scenes, however intuitively it should exist.

The example shows that something along these lines is possible:

desk = trimesh.load('./models/desk.obj')
for trimesh in desk.geometry.values():
    mesh = Mesh.from_trimesh(trimesh)
    scene.add(mesh)

But this approach clearly does not preserve the graphs coming for the individual trimeshes, all of them are added flattened to the final scene. If this can be correct, what was the point to initially have a graph inside each Scene? If it's not correct, kindly what is the proper way? Unfortunately, it is not clear from the documentation.