Help flying to a Rectangle using sceneMode: Cesium.SceneMode.SCENE2D

[sos...@skycatch.com]

1. A concise explanation of the problem you're experiencing.

Flying to a destination from a Rectangle when the view sceneMode: Cesium.SceneMode.SCENE2D is not working as expected. 

```

    const rectangle = Cesium.Rectangle.fromDegrees(left, bottom, right, top)

    const destination = viewer.camera.getRectangleCameraCoordinates(rectangle)

    viewer.camera.flyTo({

      destination

    })

```

When I use a SCENE3D the flyTo works correctly, but using SCENE2D it goes to unexpected places. 

2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.

It's reproducible on sandcastle: 

https://sandcastle.cesium.com/#c=ZVHLTsMwEPwVKxdSKTgPJ2lTQoUUuPGQKOKUi3G2xcKxke20Koh/x2mbUMC3nZ3ZnR1vqEYbDlvQ6BJJ2KIKDO9a/LzH/DO2LyslLeUS9FmAPmuJ/jzDQMKdamA+yJcDgpfVzf1Nco2+Jhe1rCVT0likgVkq1wLc0uO8LRg7R+cxnkVpTrJplEVZkU7zABnV2dc5ijDJIxKlJCEkL5KsyLIAAR1VDkyLIk4LMk2Ja0mlB1kcz9J0Nk1IEeczUsuvHyeNW8sltVxJ5+WQBGa0BU3xGuzjYLTaQ5VSuunpYPzxhskwi1HtGpzKxI06BlGNGF5p1Y4l8U82T3o/v3evxO5J+WPWJ+TA+Z94gVcauxOwODCuePvu7kWdFj7GoYX2XfQuw5eOvYHFzJg+/zIcRGXDN4g3l7X354drDzFBjXGdVSfEkn9A7S3K0PF/yYSiLon1wwa0oLue8hovbg8gxrgMXflfZZUSL1SfTPwG

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

I store a rectangle so when I pick a location I can zoom into the rectangle location with this snippet; 

[Omar Shehata]

This looks like a bug to me. I opened an issue here: https://github.com/CesiumGS/cesium/issues/8697

You can pass a rectangle to the destination when doing viewer.camera.flyTo, that seems to work correctly in 3D and 2D. Does that work for you?

[sos...@skycatch.com]

Yes, it's working using the rectangle. Thank you so much! 

[sos...@skycatch.com]

Following up on this, seems like after flying to the rectangle the method `camera.computeViewRectangle()` is returning undefined. 

Do you have a change to give it a check? I modified your sandcastle a little bit here

On Friday, March 20, 2020 at 3:34:20 AM UTC-6, Omar Shehata wrote:

[sos...@skycatch.com]

Well seems more like the rectangle is not available in America 

Sandcastle