[JAVA3D] Capturing jpeg.

[Claudio Mazzuco]

I've tried to use the code on the FAQ of j3d.org, to capture a frame
from a Canvas3D and save it in jpg format, but it doesn't work.
I obtain only jpegs whit garbage inside, and it's strange because the
canvas3d is well rendered.
Where i'm mistaking?

This is the main declaration:

public class MainGui extends javax.swing.JFrame {

   public manage3d.render3d.CapturingCanvas3D canvas3d;

   [..]

    public MainGui() {
       GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
       canvas3d = new manage3d.render3d.CapturingCanvas3D(config);

       [..]
    }
[...]

// here i make the snapshot
        manage3d.render3d.Snapshot s = new manage3d.render3d.Snapshot();
       s.captureImage(this.canvas3d);
}

This is the class who calls the jpeg creation:

public class Snapshot {
   public Snapshot() {
   }

   public static void captureImage(CapturingCanvas3D MyCanvas3D) {
       MyCanvas3D.writeJPEG_ = true;
       MyCanvas3D.repaint();
   }

}

and this is the code of CapturingCanvas3D:

public class CapturingCanvas3D extends Canvas3D  {

   public boolean writeJPEG_;
   private int postSwapCount_;

   public CapturingCanvas3D(GraphicsConfiguration gc) {
       super(gc);
       postSwapCount_ = 0;
   }

   public void postSwap() {
       if(writeJPEG_) {
           System.out.println("Writing JPEG");
           GraphicsContext3D  ctx = getGraphicsContext3D();
           // The raster components need all be set!
           Raster ras = new Raster(
           new Point3f(-1.0f,-1.0f,-1.0f),
           Raster.RASTER_COLOR,
           0,0,
           800,600,
           new ImageComponent2D(
           ImageComponent.FORMAT_RGB,
           new BufferedImage(800,600,
           BufferedImage.TYPE_INT_RGB)),
           null);

           ctx.readRaster(ras);

           // Now strip out the image info
           BufferedImage img = ras.getImage().getImage();

           // write that to disk....
           try {
               FileOutputStream out = new
FileOutputStream("c:\\Capture"+postSwapCount_+".jpg");
               JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
               JPEGEncodeParam param =
encoder.getDefaultJPEGEncodeParam(img);
               param.setQuality(0.9f,false); // 90% qualith JPEG
               encoder.setJPEGEncodeParam(param);
               encoder.encode(img);
               writeJPEG_ = false;
               out.close();
           } catch ( IOException e ) {
               System.out.println("I/O exception!");
           }
           postSwapCount_++;
       }
   }
}

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