Given a set of gltf input LODs that have the same materials for each LOD:

1. the images get packed multiple times (once per GLTF file), even though they could be packed just once if they're identical
2. the merged GLTF json will contain redundant material information
3. the exported GLB will as a result embed the same data (textures/images etc) once per LOD level, whereas it should really all share the one set of materials/textures/images

Some possible solutions:

1. Add a flag to WindowsMRAssetConverter to specify whether the materials are shared between LODs, and if so, make the merger avoid adding new resources.
2. Detect duplicate resources in the merger by binary comparision, and then resolve/remap all necessary places in the resulting GLTF json. Note that this wouldn't fix the issue with doing packing once per GLTF input file. Pack the images/textures after merging, assuming the merge step has eliminated all duplicates.