Re: [JAVA3D] Offscreen Rendering with empty Image

[Bj�rn Voigt]

Kevin Glass schrieb:

I tried it and the other, but it does not work,
could you run this code on your machine,
that I know, that my configuration is OK?
Thank for the time, you are spending for
my problem.
Bj�rn


Try changing

test.u = new SimpleUniverse();

to

test.u = new SimpleUniverse(c);

And take out your view lines...

I assume this is the same thing, but its how I got it to work..

Kev



Hi Kevin,

thank you for your fast reply, but it still not work



Looking at the code for model2sprite (http://model2sprite.dev.java.net)
three things might be worth trying:
1) Make sure rendering your scene to a normal canvas actually shows
something.

This works , I use the HelloUniverse Demo with a cube3d and a normal
canvas shows the Image without problems.


2) Try using c.getOffscreenBuffer().getImage() after the rendering
instead of relying on you're original image.

This was not successful, but this the same like using the reference of
the BufferedImage I used to create the Buffer.


3) Try causing the scene to render a few times
(c.renderOffScreenBuffer(),c.waitForOffScreenRendering()) before using
the image, since some behaviors need a few frames to get going.

There was Nothing after 100 renderings

Shit !!!!!!!!



I'm not sure what you're doing with the View.addCanvas3D() thing, its
not quite the same as how I did it. If you're interested it might be
worth checking out the org/newdawn/model2sprite/OffscreenCanvas3D.java
from CVS on the java.net site above.
Kev



Hello Java3d Fans,

I am a Java3d beginner and want to programm an servlet, which
create an JPEG of a JAVA3d-Scene.
I wrote a test class using Canvas 3d in offscreen mode, but all I get
is an empty Image. What did I wrong? I hope you can help me to fix
this ...
Thank you

Here is the program:

[...]

public class Test {

      private SimpleUniverse u;

      public Test(){}

      public BranchGroup createSceneGraph(){
           [...]
           return objRoot;
      }
      public static void main(String[] args) {
              Test test = new Test();
              GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration(); Canvas3D c =
new Canvas3D(config,true);
              Screen3D sOff = c.getScreen3D();
              c.getScreen3D().setSize(100,100);
              c.getScreen3D().setPhysicalScreenWidth( (0.0254/90.0)*
100);
c.getScreen3D().setPhysicalScreenHeight((0.0254/90.0)*
100);
              BranchGroup scene = test.createSceneGraph();
              test.u = new SimpleUniverse();
              test.u.getViewingPlatform().setNominalViewingTransform();
test.u.addBranchGraph(scene);
              View v = test.u.getViewer().getView();
              v.addCanvas3D(c);
              BufferedImage bImage = new BufferedImage(100, 100,
BufferedImage.TYPE_INT_RGB);
              ImageComponent2D buffer = new
ImageComponent2D(ImageComponent.FORMAT_RGB,
bImage);
              buffer.setCapability(ImageComponent2D.ALLOW_IMAGE_READ);
              c.setOffScreenBuffer(buffer);
              c.renderOffScreenBuffer();
              c.waitForOffScreenRendering();
              try {
                      DataOutputStream output = new
DataOutputStream(new
FileOutputStream("C:\\borstels-offscreen-test.jpg"));
                      JPEGImageEncoder encoder =
JPEGCodec.createJPEGEncoder(output);
encoder.encode(bImage);
                      output.flush();
                      output.close();
              } catch (Exception e) {
                      // TODO Auto-generated catch block
                      e.printStackTrace();
              }
      }
}
Thank you for helping

Bj�rn

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