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Instead of simplifying every LOD from the original down to an increasing number of triangles, we simplify each LOD from the previous LOD and stop when the simplification can't proceed further. This has a few benefits: - It's significantly faster; using sparse flag helps ensure that subsequent simplifications after the first one are increasingly cheaper. - It results in higher quality attributes on generated LODs; attribute quadrics reduce the quality of attribute preservation the more they are accumulated, so recomputing them from intermediate geometry helps. - It results in monotonic appearance: if a feature is reduced in a higher LOD, it will stay reduced or get reduced more significantly in lower LODs. This is not a significant problem right now, but can be helpful to ensure if the number of LODs increases or some newer features get enabled.