the orientation is invalid in the demo

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

    "orientation" : {
        "velocityReference": "#position"
the orientation is invalid in the demo

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

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

4. The Cesium version you're using, your operating system and browser.

cesium1.50 chrome

Hey, can you describe a bit more what you mean? Are you getting an error when you run this demo? If so, what’s the error?

Or do you mean when you change the code, you’re running into a bug? If so, you can click on the “Share” button in Sandcastle and copy and paste the link you get here so that I can take a look at your code example.