Is that related to the fact (empirical constatation) that a triangle with 
at least a non-numeric vertex (e. g. "NaN" float as the z coordinate) is 
eliminated from rendition in jmol and cython ?

--
Emmanuel Charpentier

Le lundi 16 octobre 2017 19:30:21 UTC+2, Andrey Novoseltsev a écrit :
>
> It is known - I have complained several times over the years, but my 
> understanding is that solving this is difficult. It has to do with the 
> algorithm that throws away triangles as invisible, and when the surface is 
> simple like a plain and contains few triangles, you see this behaviour. It 
> can be solved in each particular case by subdividing surfaces, but 
> something generic and automatic will be trickier. Paul Masson who wrote the 
> current implementation may say more perhaps.
>

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