[Octave-bug-tracker] [bug #41277] isosurface plotting performance poor on random data

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?41277>

                 Summary: isosurface plotting performance poor on random data
                 Project: GNU Octave
            Submitted by: None
            Submitted on: So 19 Jan 2014 12:44:26 UTC
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.0
        Operating System: Microsoft Windows

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Details:

Suppose you have the following piece of code

n=64
space = -n/2:n/2-1
[x,y,z] = meshgrid (space,space,space);
v = randn(n,n,n);   %some measurement data
isosurface (x, y, z, v, 0.8);


On my GNU Octave build for Windows, this script never displays anything. The
plotting window is frozen, CPU consumption is high, memory usage is high. 
The same script under Linux works, but the plot window reacts very slowly to
zoom/panning.

I know, my data is not the best, but I would not consider it bad on purpose!
Therefore plotting should work (by reducing the number of patches to draw,
subsampling,...) or issue a warning ("you are about to do something
stupid...")

Installed: http://octave.osuv.de/3.8/windows/octave-3.8.0-1-installer.exe)




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