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[Octave-bug-tracker] [bug #56979] Using plot3 parts of the curves are no

From: Pantxo Diribarne
Subject: [Octave-bug-tracker] [bug #56979] Using plot3 parts of the curves are not visible
Date: Wed, 2 Oct 2019 15:53:04 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0

Update of bug #56979 (project octave):

                Category:                Plotting => Plotting with OpenGL   
              Item Group:                    None => Inaccurate Result      
                 Release:                   5.1.0 => dev                    
        Operating System:       Microsoft Windows => Any                    


Follow-up Comment #2:

I can confirm the bug shown in comment #1. I think there are two issues:
* z-fighting between grid lines and (1) plot lines or (2) axes main lines
(y-axis in second image). The workaround is to either avoid using grids in 3D
plots or manually change zlim so that grid and plot positions don't overlap
(won't solve(2)), e.g:

ylim([0.95 2.05])

* Even without any grid line or background axes plane, curves with high
definition have spurious white pixels (onscreen and in raster printout). When
the anti-aliasing is turned off, this effect disappears as noted in comment 9
of bug #54554. My guess is that the OpenGL rasterizer has hard time deciding
what to do at line segment junctions.

Marking bug as OpenGL specific.


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