[Octave-bug-tracker] [bug #57553] ML/Octave visual differences in plotting

[Markus Mützel]

Follow-up Comment #37, bug #57553 (project octave):

The additional faces in "demo light 10" were due to a bug in "isosurface".
When "__unite_shared_vertices__" is called with faces that contain NaN
vertices, those vertices are changed to a "valid" vertex. "isosurface" when
called with "noshare" was not affected.
I resolved this by eliminating all "non-valid" faces in "isosurface" before
calling "__unite_shared_vertices__" here:
http://hg.savannah.gnu.org/hgweb/octave/rev/7cc9f35c2829

We probably need another fix for "reducepatch" which also uses
"__unite_shared_vertices__".

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