I'm sorry, I don't know how to attach images or files to the message!
Basically, what I don't understand is the following. The topology is the following:
Camera can see MeshInstance.
Now, if I do the following:
I.e. MeshInstance2 parent is also Viewport. Camera cannot see MeshInstance2.
And in this topology camera can see both MeshInstance and MeshInstance2.
In all cases global positions of all MeshInstance-s are (0,0,0).
May I know why in 2-d case (both are parented to Viewport) Camera sees only its direct parent but doesn't see parent's sibling?