wpf 3D对象StoryBoard动画在代码中指向XYZ

Question

1. 我想更改3D对象点XYZ。
2. 有可能吗？
3. 你有什么参考吗？很多参考工具都没有Point3D Animation
4. 如何使用Point3D Property？

我想这样做： http://www.youtube.com/watch?v=gTz7jSU-C5I

动画

Storyboard s = new Storyboard();

        ModelVisual3D MV = mainViewport.Children.ElementAt(current) as ModelVisual3D;
        Model3DGroup cube = MV.Content as Model3DGroup;

        for (int j = 0; j < cube.Children.Count; j++)
        {

            Model3DGroup Point_X= cube.Children[j] as Model3DGroup;

            DoubleAnimation doubleAnimation = new DoubleAnimation();
            doubleAnimation.To = 2;
            doubleAnimation.Duration = new Duration(TimeSpan.FromSeconds(2));

            s.Children.Add(doubleAnimation);
            s.Duration = new Duration(TimeSpan.FromSeconds(2));

            Storyboard.SetTarget(doubleAnimation, cube);
            Storyboard.SetTargetProperty(doubleAnimation, new PropertyPath(" ??? "));

            s.Begin(); // Exception during the execution.

        }