Camera orientation problem with sampledPositionProperty and trackedEntity

[lukemckinstry]

What happened?

When we have an Entity with a SampledPositionProperty set as trackedEntity, and change the position by a large distance (ie. > 0.01 degree lon or lat) the orientation of the camera changes during the repositioning.

Reported in the forums https://community.cesium.com/t/camera-position-problem-with-sampledpositionproperty-and-trackedentity/36360

From my own reproduction
Screencast from 11-07-2024 12:45:46 PM.webm

Reproduction steps

...

Sandcastle example

https://sandcastle.cesium.com/index.html#c=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

Environment

Browser:
CesiumJS Version:
Operating System:

[ggetz]

@lukemckinstry I think there is a chance this is fixed in #12194. Could be worth trying to reproduce in that branch.

[lukemckinstry]

I can still reproduce the issue in that branch.

[ggetz]

Thanks for trying!

[jfayot]

Hi @lukemckinstry. Have you tried setting entity.trackingReferenceFrame to TrackingReferenceFrame.INERTIAL ?

[jfayot]

@lukemckinstry I've tried your sandcastle in my branch and setting entity.trackingReferenceFrame to TrackingReferenceFrame.INERTIAL, and it behaves correctly!
What you're experiencing I guess in this issue is a threshold effect with the auto-detect tracking algorithm: low altitude / low speed objects are tracked into their ENU reference frame, while high speed / high altitude objects are tracked in their VVLH frame. If you decrease the increment in handleKeyDown to 0.001 (which is equivalent to decreasing the entity's velocity) you see the orientation issue disappear...
My PR aims at solving this kind of issue by adding different kind of tracking reference...

[lukemckinstry]

@jfayot thanks for following up. You are correct, #12194 fixes this issue! 👍