I want to use TrackedEntity but the perspective is fixed, how should I change

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

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.

use viewfrom property, h/p/r is not supported yet.

There is additionally a suggestion for a workaround in this GitHub issue.