I skimmed through the documention, seems like this function is not support?
In your case it would be much simpler to work at the vertex data level.
yes, more workable, but it seems like there are no available documents or demos about this situation? if not, it would be helpful to share some links
Nothing about editing or deleting facets directly but these docs links might be useful in producing such a feature
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it seems like these are not what I want, thanks anyway 
removing faces should be as simple as updating the indices with mesh.updateIndices ? you could leave the rest of the vertices in
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