Billboard clustering flickering / blinking when zoom level changes

CesiumJS
1

Hi,
I’m using CustomDataSource with EntityCluster enabled for billboards.

When changing the camera zoom level, the clustered billboards start flickering/blinking
(Attached GIF)

Recording 2026-01-21 115201
This seems related to how pixelRange and screen-space projection behave during continuous zoom.

Questions:

Are there best practices to avoid flickering when zooming (hysteresis, debounce, fixed thresholds)?

Is this a known behavior/limitation of EntityCluster?

Is there an internal smoothing mechanism recommended for cluster transitions?

We can use this Sandcastle | CesiumJS for the playground

I already created an issue request in github:

2

Thanks @Sharon_Katz for this post and opening a bug report in GitHub (and welcome to the Cesium community!)

I responded on your GitHub issue that this seems to be a regression. Since this is a bug, let’s continue the conversation for further investigation and finding a solution on the GitHub issue for now.

Thanks,
Luke