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  Cannot understand how TransformGroup above ViewPlatform is updated.  (Read 3003 times)
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Offline DoubleBarrel

Senior Newbie





« Posted 2009-11-12 12:33:05 »

Hi, I am a Java 3d beginner.

I am currently reading the book KJGP and doing fairly well following the examples, however there is one piece of code in chapter 15 I cannot understand clearly. The comments are my current understanding of the code. Please correct me:

Quote
private void initUserPosition()
 
  {
    //get viewing platform from simple universe into vp
    ViewingPlatform vp = su.getViewingPlatform();
   
    //get the transform group above the viewPlatform into steerTG
    TransformGroup steerTG = vp.getViewPlatformTransform();

    //set t3d with the same value of steerTG
    Transform3D t3d = new Transform3D();
    steerTG.getTransform(t3d);

    //manipulate t3d's values to be looking at the values specified in lookAt. And invert.
    t3d.lookAt( USERPOSN, new Point3d(0,0,0), new Vector3d(0,1,0));
    t3d.invert();

    //make the value of steerTG the same as the values in t3d.
    steerTG.setTransform(t3d);
  }  // end of initUserPosition()

Now my problem is -how does the change in steerTG is passed to the TransformGroup above the ViewPlatform; when in the above code, the TransformGroup above the ViewPlatform isn't updated with the values in steerTG through any methods?

Thankyou for your kindness and patience.

And Java Goes On
Offline tom
« Reply #1 - Posted 2009-11-12 17:31:08 »

steerTG IS the TransformGroup above the ViewPlatform. Changing its transform will update the position of the view.

Offline DoubleBarrel

Senior Newbie





« Reply #2 - Posted 2009-11-12 17:39:08 »

So, .getViewPlatformTransform(); returns the actual TransformGroup above the ViewPlatform, and not only a copy of its contents?

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Offline tom
« Reply #3 - Posted 2009-11-13 07:34:56 »

Yes

Offline DoubleBarrel

Senior Newbie





« Reply #4 - Posted 2009-11-13 16:20:58 »

Thankyou very much Tom  Grin
I understand now Roll Eyes.

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