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[Octave-bug-tracker] [bug #51444] surf(): additional white lines in surf

From: Rik
Subject: [Octave-bug-tracker] [bug #51444] surf(): additional white lines in surface plot
Date: Thu, 13 Jul 2017 21:27:17 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:54.0) Gecko/20100101 Firefox/54.0

Update of bug #51444 (project octave):

                  Status:                    None => Confirmed              


Follow-up Comment #3:

The white lines are simply the axes color showing through.  You can check that
by setting the axes background color to something vivid.  Assuming the sample
code from comment #2 has been executed, try

set (gca, 'color', 'b')

This might be an Octave problem, but it's not an obvious one.  The lines
appear to be where OpenGL has broken surfaces into triangles when tessellating
the surface.  In particular, a square gets broken in to two triangles which
"overlap" along the diagonal of the square.  I think someone who is a real
OpenGL expert needs to review libinter/corefcn/gl-render.cc.


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