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[Octave-bug-tracker] [bug #52266] axis lines not shown in plot window

From: Rik
Subject: [Octave-bug-tracker] [bug #52266] axis lines not shown in plot window
Date: Wed, 25 Oct 2017 14:52:26 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0

Update of bug #52266 (project octave):

                Category:    Plotting with OpenGL => Documentation          


Follow-up Comment #13:

I think the benchmarking is a useful piece of code to have.  When it is fully
ready it should become part of the compare_plot_demos.m script so that we can
run this before each release to see if plotting or performance has suffered.

However, for this bug report, the issue is how to instruct a user on how to
set LIBGL_ALWAYS_SOFTWARE if they find innacurate renderings.  I changed the
Category of this bug to Documentation.  I don't know if the new documentation
should be in the manual, maybe in Appendix D about Known Bugs?  Or should it
be on the wiki?

Seems like there should be a brief explanation of how Octave emits OpenGL
instructions, but those instructions have to be interpreted by someone: 1)
either a software library, or 2) directly by HW in a graphics card.  Even
though Octave emits valid OpenGL code, problems can arise if there are bugs in
the implementation of either 1) or 2).

Then, ask the user to run the code

graphics_toolkit qt
plot ([0 1])

and see if the axes lines are visible.  If they aren't, recommend using the
environment variable to disable HW acceleration.


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