In godot engine we decide to do a continuous level of detail based a pixel error metric. (simplified explanation pixel-error -> based on fov -> based on floating point error of the meshopt_simplifyWithAttributes function)
Jason Booth (the author) also has a YouTube channel talking about similar topics.
I really liked his 'Practical Optimizations' video: https://youtu.be/NAVbI1HIzCE
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[ 3.1 ms ] story [ 21.4 ms ] threadThe 12 ish lods are automatically generated by https://github.com/zeux/meshoptimizer.
https://docs.godotengine.org/en/stable/tutorials/3d/mesh_lod...
We allow a hierarchical level of detail if people want to set it up.