How can I, simply, rotate a model entity?

CesiumJS
1

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

I'd like to rotate a 3D model that I've got on the map, but nothing I have tried has worked so far. Cesium Sandbox has a rotation property on things like cubes, so I'd assume the same should apply to models? The most recent code I've tried is as below, but I've also tried making a modelMatrix with the position, but I can't figure out how to get that to rotate either.
Thanks!

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

    var plane = viewer.entities.add({
      position: Cesium.Cartesian3.fromDegrees(40.0, 100.0, 5000),
      model: {
        uri: '/models/plane.glb',
        rotation: Cesium.Math.toRadians(45)
      }
    })

In this example, the rotation attribute does nothing.

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

I'd like to rotate the model by a certain amount, say 45 degrees.

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

Cesium 1.58.1
Firefox 68
Windows 10 17763

2

You can see there is no rotation property on a model here: https://cesiumjs.org/Cesium/Build/Documentation/ModelGraphics.html?classFilter=Model

There is an orientation property on the entity itself, you can see how it’s used on a 3d model here: https://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=3D%20Models.html

There’s a code example showing how to rotate it over time in this GitHub issue: https://github.com/AnalyticalGraphicsInc/cesium/issues/7961

Hope this helps! What kind of application are you working on?