I think that I have found a problem with the rendering of semi-opaque 
surfaces in threejs : some portions of semi-opaque surfaces that should be 
rendered as if seen "through" other semi-opaque surfaces  "snap" in and out 
of existence when the graph is rotated or rescaled.

This is much more easily shown than explained. Run the attached Jupyter 
notebook worksheet (after scannig it with your favorite anti-virus 
software...) : it allows to compare the behaviour of jmol (sjow and 
not-so-clean, but correct) and threejs (faster, smoother, but scarce in 
details and sometimes just plain wrong).

This is *not* reported on Trac (at least, none of the 28 tickets (4 open) 
retrieved by a search on "threejs" treat it).

Is it ticket-worthy ?

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Attachment: ThreeJS opacity problem..ipynb
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