3DzzD: Offscreen rendering - Java-Gaming.org

I'm trying to get 3DzzD to render without having a visible display - i've got the following which almost works, but the actual library doesn't want to give me any output:

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public class DzzdAppTest
{

   public static void main(String[] args)
   {
      Toolkit.getDefaultToolkit();
      
      DzzdAppTest app = new DzzdAppTest();
      app.run();
   }
   
   private JFrame frame;
   private OwnCanvas canvas;
   
   
   IRender3D render3d;
   IScene3D scene3d;
   
   
   
   public DzzdAppTest()
   {
      createDzzd();
      
      frame = new JFrame();
      frame.setLayout(new BorderLayout());
      
      canvas = new OwnCanvas();
      canvas.setMinimumSize( new Dimension(200, 200));
      canvas.setPreferredSize( new Dimension(200, 200));
      canvas.setMaximumSize( new Dimension(200, 200));
      
      frame.getContentPane().add(render3d.getCanvas(), BorderLayout.NORTH);
      frame.getContentPane().add(canvas, BorderLayout.CENTER);
      
      frame.setSize(200, 400);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      
      render3d.setScreenUpdateEnabled(true);
      render3d.setPixelUpdateEnabled(true);
      render3d.getCanvas().setVisible(true);
      render3d.getCanvas().invalidate();
      
      // This will not render anything
      renderSingleFrame();
      
      frame.pack();
      frame.setVisible(true);
      
      // Now the frame is visible (and the canvas is valid) this will render correctly
      renderSingleFrame();
   }
   
   private void createDzzd()
   {
      // Ask 3DzzD factory for a fresh Scene3D
      this.scene3d = DzzD.newScene3D();   
      
      //Create a Scene3D loader and link it to a 3DS file
      IScene3DLoader loader = DzzD.newScene3DLoader();
      loader.loadScene3D("file:/Users/Orangy/Documents/CodeRepository/Tectonicus/Data/Test/","CUBE.3DS");
      
      // Add the loader to the scene
      this.scene3d.setScene3DLoader(loader);
      
      // Wait until all object & texture are loaded
      while(this.scene3d.getNbMonitoredSceneObject()!=0)
      {
         this.scene3d.updateMonitoredSceneObjects();   
         DzzD.sleep(10);
      }
      
      // Set the active camera in the 3d scene
      this.scene3d.setCurrentCamera3DByName("Camera01");
      
      // Ask 3DzzD factory for a software 3D Render
      this.render3d = DzzD.newRender3D(this.getClass(), "SOFT", null);
      
      // Set the Render3D size and enable maximum antialias
      this.render3d.setSize(200, 200 ,7);
      
      // Set Camera Aspect ratio to 1:1
      this.scene3d.getCurrentCamera3D().setZoomY(((double)this.render3d.getWidth())/((double)this.render3d.getHeight()));   
      
      // Tell the Render3D wich camera it should use to render
      this.render3d.setCamera3D(this.scene3d.getCurrentCamera3D());
   }
   
   public void run()
   {
      Canvas c = new Canvas();
      Graphics g = c.getGraphics();
      System.out.println(g);
   }
   
   public void renderSingleFrame()
   {
      //Set the scene to world space
      this.scene3d.setScene3DObjectToWorld();
      
      //Set the scene to active camera space
      this.scene3d.setScene3DObjectToCamera();
      
      //Tell the 3D render to compute & draw the frame
      this.render3d.renderScene3D(this.scene3d);
   }
   
   private class OwnCanvas extends Canvas
   {
      private static final long serialVersionUID = 1L;

      @Override
      public void paint(Graphics g)
      {
         super.paint(g);
         
         g.setColor(Color.green);
         g.fillRect(0, 0, 200, 200);
         
         render3d.getCanvas().paint(g);
      }
   }
}

I've been poking around the source but unfortunately can't seem to spot anything obvious. Does anyone have any hints as to how to fix this? (Dzzd? You around?)

Thanks.