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(1) The docs suggest that normal indices are optional. I just took a
working mesh, added *only* a normal_vectors section, and got an error
message about missing normal_indices.
(2) IMHO, you should build a complete, non-optimized mesh with all its
components (i.e., normal_indices) before optimizing it. The way it's
done in the docs leaves me totally confused as to what a normal_indices is.
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