Thank you for your answers ;)

Can be a beginning of solution: the spherical triangle is obtained by
the difference between the sphere and three planes defined by the normal
of the three vectors taken two by two.

Now I have to find out how to draw the arcs (not necessarily "great
circles") connecting the points.

Image of the first experiment here



-- 
Kurtz le pirate
Compagnie de la Banquise

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