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Hi, This is a duplicate of bug #44181 which has been close because Matlab doesn't do better: this is an intrinsic "feature" of OpenGl that it breaks polygons into smaller triangles. The lines that we see are due to anti-aliasing issues.
Reproduction protocol: Use the second fill demo (dark blue and dark red polyons) and save the figure as either png or pdf. The image files show transparent lines between the triangles of the polygons. The lines are very thin, but clearly visible. See attached files. The on-screen figure does not show these lines. The problem occurs in either combination of Windows, GNU/Linux, Octave 3.8.2 and Octave 4.0rc4 with both fltk and qt (gnuplot is not affected). Expected result: No visible lines in the PNG and connected polygon in the PDF.
(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)
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