inherited or not ?

[warm ginkgo]

Its because mesh is not a class but a variable inside of MeshInstance3D classes

So this isnt inheritence, since MeshInstance3D does not inherit Mesh nor the other way around. MeshInstance3D is a 3D node that allows a mesh to be set thru its variable mesh. Mesh itself is a resource that contains the data for the mesh (my knowledge on this is low since I barely use 3D). But yeah

[solid marsh]

Btw. if you want to check node/class inheritance, the manual shows it quite clearly