title: How to create `.u3d` files?
body: <p>I'm working on a project for school and I've got some 3D vector data as well as surface plots. These are saved in <code>.dat</code> files outputted from a <code>c++</code> program. </p>
  
  <p>I'm able to plot these files in <code>gnuplot</code> as wanted, but I'd really like to make <code>.u3d</code> files so I can include them in a TeX document (using the <code>movie15</code>package).</p>
  
  <p>How do I create u3d files? (I'm working on mac).</p>