[Octave-bug-tracker] [bug #54922] demo surfl 1 fails

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?54922>

                 Summary: demo surfl 1 fails
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Tue 30 Oct 2018 11:59:10 AM PDT
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  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:

I get an error when running the demos for surfl.  See session log below.


octave:1> demo surfl 1
surfl example 1:
 clf;
 [X,Y,Z] = sombrero ();
 colormap (copper (64));
 surfl (X,Y,Z);
 shading interp;
 title ("surfl() with defaults");

surfl example 1: failed
vn(_,_,2): but vn has size 0x0


The problem is in surfl.m


    vn = get (htmp, "vertexnormals");
    dar = get (hax, "dataaspectratio");
    vn(:,:,1) *= dar(1);
--> vn(:,:,2) *= dar(2);
    vn(:,:,3) *= dar(3);


The issue is that vn is empty.  I went and checked with Octave 4.2.1 and
apparently there should be data there.





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