bugGNU Octave - Bugs: bug #37598, OpenGL lines render as dotted...


bug #37598: OpenGL lines render as dotted lines on some drivers

Submitted by:  Mike Miller <mtmiller>
Submitted on:  Thu 18 Oct 2012 08:08:05 PM UTC  
Category: Plotting with OpenGLSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Incorrect Result
Status: FixedAssigned to: None
Originator Name: Open/Closed: Closed
Release: devOperating System: GNU/Linux

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Sun 16 Feb 2014 03:33:49 PM UTC, comment #3:

This is fixed for me on the gui-release branch now with the following changeset:


Mike Miller <mtmiller>
Project Member
Sat 12 Oct 2013 08:03:11 PM UTC, comment #2:

Thanks for testing and confirming.

I also forgot to mention that the graphics card I see this on is a hybrid Optimus setup (Intel built-in plus Nvidia). When I use the Intel graphics I see the dotted lines as originally reported. If I use the Nvidia card (using bumblebee / optirun) the lines appear solid as they should.

Mike Miller <mtmiller>
Project Member
Sat 12 Oct 2013 07:58:41 PM UTC, comment #1:

This issue also affects the current 3.7.7+ version of octave.

I'm using the intel driver on Ubuntu 12.04.3.

The plotted line and grid line becomes visible if its width is set to 1 (instead of 0.5).

I could not reproduce this error with a simple fltk program where is plotted a line of 0.5 width. The line appears in all cases as a solid line independently of the setting of GL_LINE_SMOOTH.

Alexander Barth <abarth>
Thu 18 Oct 2012 08:08:05 PM UTC, original submission:

I asked this on the maintainers list first and the consensus was that this is not correct and it should be fixed to render the same on all graphics hardware.


FLTK plots on a Debian GNU/Linux system using the i965 Intel graphics driver appear as in this capture:


All other systems I have tried show up as in this capture:


which I assume is the way they should appear.

An uninitialized antialiasing setting was proposed as the possible problem here.

Mike Miller <mtmiller>
Project Member


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    Follow 3 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Sun 16 Feb 2014 03:33:49 PM UTCmtmillerStatusConfirmed=>Fixed
    Sat 12 Oct 2013 08:03:11 PM UTCmtmillerStatusNone=>Confirmed

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