示例#1
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  public BranchGroup createSceneGraph() {
    // Create the root of the branch graph
    BranchGroup objRoot = new BranchGroup();

    // Create the TransformGroup node and initialize it to the
    // identity. Enable the TRANSFORM_WRITE capability so that
    // our behavior code can modify it at run time. Add it to
    // the root of the subgraph.
    TransformGroup objTrans = new TransformGroup();
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    objRoot.addChild(objTrans);

    // Create a simple Shape3D node; add it to the scene graph.
    objTrans.addChild(new ColorCube(0.4));

    // Create a new Behavior object that will perform the
    // desired operation on the specified transform and add
    // it into the scene graph.
    Transform3D yAxis = new Transform3D();
    Alpha rotationAlpha = new Alpha(-1, 4000);

    RotationInterpolator rotator =
        new RotationInterpolator(rotationAlpha, objTrans, yAxis, 0.0f, (float) Math.PI * 1.0f);
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
    rotator.setSchedulingBounds(bounds);
    objRoot.addChild(rotator);

    // Have Java 3D perform optimizations on this scene graph.
    objRoot.compile();

    return objRoot;
  }
  // Directional light rotating around the scene and some ambient light.
  public void addLight(SimpleUniverse su) {

    BranchGroup bgLight = new BranchGroup();

    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), Double.MAX_VALUE);

    // Directional light (to be rotated).
    Color3f lightColour = new Color3f(1.0f, 1.0f, 1.0f);
    Vector3f lightDir = new Vector3f(0.0f, 0.0f, -1.0f);
    DirectionalLight light = new DirectionalLight(lightColour, lightDir);
    light.setInfluencingBounds(bounds);

    // The transformation group for the directional light and its rotation.
    TransformGroup tfmLight = new TransformGroup();
    tfmLight.addChild(light);

    // The Alpha for the rotation.
    Alpha alphaLight = new Alpha(-1, 4000);
    // The rotation
    RotationInterpolator rot =
        new RotationInterpolator(
            alphaLight, tfmLight, new Transform3D(), 0.0f, (float) Math.PI * 2);
    rot.setSchedulingBounds(bounds);

    tfmLight.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    tfmLight.addChild(rot);

    bgLight.addChild(tfmLight);

    // Ambient light.
    Color3f ambientLightColour = new Color3f(0.5f, 0.5f, 0.5f);
    AmbientLight ambLight = new AmbientLight(ambientLightColour);
    ambLight.setInfluencingBounds(bounds);
    bgLight.addChild(ambLight);

    su.addBranchGraph(bgLight);
  }