[Octave-bug-tracker] [bug #55493] Orientation of automatically calculated normals differ from Matlab

[Markus Mützel]

URL:
  <https://savannah.gnu.org/bugs/?55493>

                 Summary: Orientation of automatically calculated normals
differ from Matlab
                 Project: GNU Octave
            Submitted by: mmuetzel
            Submitted on: Wed 16 Jan 2019 07:40:04 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

Running "demo isonormal 1" in Octave and in Matlab (see bug #55481), the
direction of the automatically calculated normals is different in Matlab and
in Octave. 
While in Matlab all normals seem to point towards the center (the origin or
the barycenter of the patch?), they point in different directions in Octave
(determined by the order of the vertices in each face).
This is not a bug in isonormal but in the algorithm that is used to
automatically calculate the normals.




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