bugGNU Octave - Bugs: bug #45357, patch does not stack properly

 
 

bug #45357: patch does not stack properly

Submitted by:  Muhali <muhali>
Submitted on:  Fri 19 Jun 2015 02:31:20 PM UTC  
 
Category: Plotting with OpenGLSeverity: 3 - Normal
Priority: 5 - NormalItem Group: None
Status: DuplicateAssigned to: None
Originator Name: Open/Closed: Closed
Release: devOperating System: GNU/Linux

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Fri 19 Jun 2015 02:57:37 PM UTC, comment #1:

Hi,

Yes, this is a known issue (see bug #44735): see also the plot comparison page ([1], search for "patch" keyword).

Basically, when two patches have the same z coordinate, OpenGl has a way to disambiguate which one should be drawn on top of the other : glPolygonOffset. Unfortunately this doesn't work for line primitives that we associate with polygons (see e.g. [2]).

Can you report in bug #44735 the additional informations you brought: pdf are rendered correctly in ML.

Closing report as duplicate.

[1] http://tech-chat.de/compare_plot_demos/
[2) https://www.opengl.org/archives/resources/faq/technical/polygonoffset.htm

Pantxo Diribarne <pantxo>
Project Member
Fri 19 Jun 2015 02:31:20 PM UTC, original submission:

With two triangles created this way

one gets the figure attached. The right edge of the first (black) triangle should not be visible.

ML does it correctly, but interestingly, when printing to png one gets the same black line, while pdf prints are ok.

Muhali <muhali>

 

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Attached Files
file #34262:  octave.png added by muhali (29KiB - image/png)

 

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  • -unavailable- added by pantxo (Posted a comment)
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    Follow 4 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Fri 19 Jun 2015 02:57:45 PM UTCpantxoOpen/ClosedOpen=>Closed
    Fri 19 Jun 2015 02:57:37 PM UTCpantxoCategoryPlotting=>Plotting with OpenGL
      StatusNone=>Duplicate
    Fri 19 Jun 2015 02:31:20 PM UTCmuhaliAttached File-=>Added octave.png, #34262

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