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The [http://opendx.org/ OpenDX software is a powerful program for visualising multi-dimensional data].
== How to use dx ==
Run <code>dx</code>, and then in the '''Data explorer''' or '''DE'''.
* Click on <code>Edit Visual Programs...</code>.
* Select the <code>map.net</code> program created by relax,
Now in the <code>Visual Program Editor</code> or <code>VPE</code>.
* Select the menu entry <code>Execute->Execute on change</code>.
That's it.
You now have a 3D frame, but nothing in it. Therefore the contour levels must be too low or high. From the map file, the values are in the hundreds of thousands.
Then:
* In the main program window, double click on the <code>Isosurface elements</code>.
* Change the values until you see surfaces. In the first the value is 500. I changed this to 500,000. Multiply all by 1000.
* In the second, 100 -> 100000.
* In the third, 20 -> 20000.
* In the last, 7 -> 7000.
This should maybe be performed by the dx.map user function, determining reasonable contour levels.
With a bit of zooming, clicking on <code>File -> Save image</code> in the <code>Surface</code> window, <code>allowing rendering</code>, and outputting to a large TIFF file, <code>save current</code>, then <code>apply</code>.
An example image cropped and converted to PNG in the GIMP at https://gna.org/bugs/download.php?file_id=20641.
Note that for a good resolution plot, you will need many more increments. Using the lower and upper dx.map arguments will be useful to zoom into the space.
== See also ==