Re: [Octave-bug-tracker] [bug #44415] OpenGL plotted image has vertical line every 4096 pixels

[Michael Godfrey]

On 03/03/2015 03:22 PM, Dan Sebald wrote:
> URL:
>    <http://savannah.gnu.org/bugs/?44415>
>
>                   Summary: OpenGL plotted image has vertical line every 4096
> pixels
>                   Project: GNU Octave
>              Submitted by: sebald
>              Submitted on: Tue 03 Mar 2015 08:22:07 PM GMT
>                  Category: Plotting with OpenGL
>                  Severity: 3 - Normal
>                  Priority: 5 - Normal
>                Item Group: Incorrect Result
>                    Status: None
>               Assigned to: None
>           Originator Name:
>          Originator Email:
>               Open/Closed: Open
>           Discussion Lock: Any
>                   Release: dev
>          Operating System: GNU/Linux
>
>      _______________________________________________________
>
> Details:
>
> I'm seeing for both FLTK and Qt graphics toolkits vertical lines in an image
> plot every 4096 pixels.  See the attached image for the result after running
> the commands
>
>
> N = 30000;
> grd = repmat((1:N)/N, 20, 1);
> image(32*grd);
I tried this on an Intel graphics system. In this case the vertical 
(white) lines are a function of the
size of the plot. Growing or shrinking the plot causes the lines to move 
or disappear.
This is a long-standing feature of Intel graphics (mine is HD Graphics 
5000).

Michael