[Octave-bug-tracker] [bug #53087] getframe not always rendering 3D surfaces properly

[Pantxo Diribarne]

URL:
  <http://savannah.gnu.org/bugs/?53087>

                 Summary: getframe not always  rendering 3D surfaces properly
                 Project: GNU Octave
            Submitted by: pantxo
            Submitted on: Wed 07 Feb 2018 12:28:57 PM UTC
                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

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Details:

As an example see the following example:


demo light 2
frame  = getframe (gcf); ## make use of glReadPixels
set (gcf, "visible", "off");
frame2  = getframe (gcf); ## make use of osmesa
imwrite (frame.cdata, "frame_visible.png")
imwrite (frame2.cdata, "frame_invisible.png")
open frame_visible.png 
open frame_invisible.png


I attached the resulting png files. When the figure is visible, getframe makes
use of glReadPixels and some primitives are simply not drawn. When the figure
is invisible, getframe makes use of osmesa pixel buffer and all primitives are
drawn properly. 



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File Attachments:


-------------------------------------------------------
Date: Wed 07 Feb 2018 12:28:57 PM UTC  Name: frame_invisible.png  Size: 14KiB 
 By: pantxo

<http://savannah.gnu.org/bugs/download.php?file_id=43199>
-------------------------------------------------------
Date: Wed 07 Feb 2018 12:28:57 PM UTC  Name: frame_visible.png  Size: 14KiB  
By: pantxo

<http://savannah.gnu.org/bugs/download.php?file_id=43200>

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