the cameras found on nodes, in node order
the parsed JSON document, for anything the loader does not map
the KHR_lights_punctual lights found on nodes, in node order
every material the loader created: one per glTF material and per combination of draw mode and vertex attributes it is used with (map presence and vertex colours are baked into the shader source)
every node of the file as a scene graph object, by glTF index
the default scene of the file (or its first scene; empty if it has none)
every scene of the file, by glTF index
every texture the loader created: one per glTF texture and colour space
What loadGltf and parseGltf return