In the callback property, the same value is obtained using VelocityOrientationProperty(). getValue

CesiumJS
1

In the callback property, the same value is obtained using VelocityOrientationProperty(). getValue, but when VelocityOrientationProperty() is used alone, it changes from time to time。

I want to rotate a model first, and then let it apply VelocityOrientationProperty

function getori(time, result) {

  let r = new Cesium.HeadingPitchRoll(
    Cesium.Math.toRadians(0),
    Cesium.Math.toRadians(0),
    Cesium.Math.toRadians(180)
  );
  var r1 = new Cesium.Quaternion.fromHeadingPitchRoll(r)
  var rwx = new Cesium.VelocityOrientationProperty(computeFlight(data_wx, 1)).getValue(viewer.clock.currentTime)
  var rwx1 = new Cesium.HeadingPitchRoll.fromQuaternion(rwx)
  let hpr = new Cesium.HeadingPitchRoll(
    rwx1.heading,
    rwx1.pitch,
    r.roll + rwx1.roll,
  )
  return rwx
}

The return value is rwx, so I found that rwx is a fixed value.

2

Hello there,

To confirm, you’re noticing that the orientation does not change when you are using getori as the parameter for a CallbackProperty, correct?

3

Yes, I assigned this callback function to a model, and then passed the
model. orientation. getValue (time) can get the correct value.

4

I’m not sure if I can replicate the issue. Here’s a sandcastle using this getori function as the callback property. Did you make sure to include false as the second parameter to the CallbackProperty?

5

Sorry, maybe I made a mistake. Thank you very much for your help. If I find the same problem later, I will contact you again!