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  Trouble getting absolute vector from a Transform3D  (Read 339 times)
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Offline blackhatbrigade

Innocent Bystander





« Posted 2013-04-22 02:31:39 »

Hope this is the right forum for this question...

I am having difficulty getting a true translation vector from a transform.

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   BranchGroup bg1 = new BranchGroup();
   BranchGroup bg11 = new BranchGroup();
   TransformGroup tg1 = new TransformGroup();
   TransformGroup tg11 = new TransformGroup();
   Transform3D trans1 = new Transform3D();
   Transform3D trans11 = new Transform3D();

   Vector3f v1 = new Vector3f(0.0f, 1.0f, 0.0f);
   trans1.setTranslation(v1);
   tg1.setTransform(trans1);
   bg1.addChild(tg1);

   v1.set(0.0f, -1.0f, 0.0f);
   trans11.setTranslation(v1);
   tg11.setTransform(trans11);
   bg11.addChild(tg11);


So far so good. I omit any geometry because I don't believe it really matters. Here is where I get an issue...

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   BranchGroup bg2 = new BranchGroup();
   TransformGroup tg2 = new TransformGroup();
   Transform3D trans2 = new Transform3D();

   tg2.addChild(bg1);  // attaching previous BranchGroup to this TransformGroup
   tg2.addChild(bg11);

   trans2.rotX(Math.PI);
   tg2.setTransform(trans2);
   bg2.addChild(tg2);

   // Now let's try to get that translation out

   Transform3D t3d = new Transform3D();
   t3d.mul(trans1, trans2);
   Vector3f v = new Vector3f();

   t3d.get(v);
   System.out.println(v.toString());


That will output: (0.0, 1.0, 0.0)

Strictly speaking, that isn't what I'm looking for. The object that I attach to tg1 will have swapped places with the object attached to tg11. Of course, it will rotated 180degrees from it's starting axis.

What I want is to be able to get the new vector on it's location (in this case, I was looking for an output of: (0.0, -1.0, 0.0)

Is that possible? Thanks in advance for any help.

(I apologize if any of the code is off, this is not the actual code I'm working on. The actual code is a little too obfuscated to easily show what I'm looking for. This is merely an example of what I'm trying for.)
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