Como definir ViewingPlatform e atualização TransformGroup?

Question

Eu tenho um dentro da cena de um TransformGroup que permite que o mouse para zoom / rotação / PAN.

Eu preciso definir a posição da câmera para trás distante o suficiente para que eu possa ver toda a cena, o que eu faço com o seguinte código:

    // Position the position from which the user is viewing the scene
    ViewingPlatform viewPlatform = universe.getViewingPlatform();
    TransformGroup viewTransform = viewPlatform.getViewPlatformTransform();
    Transform3D t3d = new Transform3D();
    viewTransform.getTransform(t3d);
    t3d.lookAt(new Point3d(0,0,50), new Point3d(0,0,0), new Vector3d(0,1,0));
    t3d.invert();
    viewTransform.setTransform(t3d);

Executar o código acima funciona em que eu possa manipular a cena com o mouse. No entanto, se eu trocar esta linha:

t3d.lookAt(new Point3d(0,0,50), new Point3d(0,0,0), new Vector3d(0,1,0));

com:

// Change value from 50 to 90 to push the camera back further
t3d.lookAt(new Point3d(0,0,90), new Point3d(0,0,0), new Vector3d(0,1,0));

eu perder a capacidade de manipular a tela com o mouse.

Como posso manter a capacidade de transformar com o mouse enquanto empurra a câmera de volta ainda mais para que eu possa ver a tela inteira?

Muito obrigado antecipadamente!

Answer 1

    GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
    Canvas3D canvas3d = new Canvas3D(config);

    // Manually create the viewing platform so that we can customize it
    ViewingPlatform viewingPlatform = new ViewingPlatform();

    // **** This is the part I was missing: Activation radius
    viewingPlatform.getViewPlatform().setActivationRadius(300f);

    // Set the view position back far enough so that we can see things
    TransformGroup viewTransform = viewingPlatform.getViewPlatformTransform();
    Transform3D t3d = new Transform3D();
    // Note: Now the large value works
    t3d.lookAt(new Point3d(0,0,150), new Point3d(0,0,0), new Vector3d(0,1,0));
    t3d.invert();
    viewTransform.setTransform(t3d);

    // Set back clip distance so things don't disappear 
    Viewer viewer = new Viewer(canvas3d);
    View view = viewer.getView();
    view.setBackClipDistance(300);

    SimpleUniverse universe = new SimpleUniverse(viewingPlatform, viewer);