[Octave-bug-tracker] [bug #38779] patch failure with quadrilateral face

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?38779>

                 Summary: patch failure with quadrilateral face
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sat 20 Apr 2013 01:27:22 AM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: Dan Newman
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.2
        Operating System: GNU/Linux

    _______________________________________________________

Details:

I'm using the fltk graphics toolkit.

The patch command sometimes (very rarely) fails to draw quadrilateral faces
correctly.  A minimal demo is:


pts = [    10.6946   -4.0000    3.0253;
   10.6946   -3.7071    3.0253;
   13.1352   -3.7071    2.9571;
   13.1352   -4.0000    2.5862 ]
facet = [ 1, 2, 3, 4 ];
patch('Faces',facet,'Vertices',pts);


This should draw a non-planar quadrilateral element.  Instead it draws a
triangular element joining points 2,3,4 only.

Note that this was extracted from a larger graphic with several hundred
vertices and faces, some quadrilateral and some triangular.  All were rendered
correctly except this one.





    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?38779>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/