While investigating the stl export from 3D plots, (which have been recently
improved, see trac-ticket-22144 <https://trac.sagemath.org/ticket/22144>) I
found a method in plot/plot3d/parametric_surface.pyx
<https://github.com/sagemath/sage/blob/develop/src/sage/plot/plot3d/parametric_surface.pyx>
that is called *triangulate*, but that actually quadrangulates the
underlying self (maybe it also produces triangles, when some quadrilateral
is degenerate, I am not sure).
def triangulate(self, render_params=None):
r"""
[…] so normals of the triangles […]
"""
# […]
face.n = 4 # […]
The reason I looked into it was that it caused problem for saving to stl
format because the old version of *stl_ascii_string* method assumed that
the output of a method called *triangulate* would always have only
*triangles*. *stl_ascii_string* have been modified in ticket 22144
<https://trac.sagemath.org/ticket/22144>, but I still thing it's kind of
counterintuitive to have a *triangulate* method that do not produces
triangles but quadrilaterals instead.
Does anybody here knows what were the reasons behind this choice ? And
where is it used ?
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