I put Babylon.js Canvas on top of CesiumJS Canvas, referring to Integrate With CesiumJS.
The purpose of Babylon.js is Transform editing with Gizmo.
Therefore, I would like to pass mouse events other than Gizmo operations to the CeciumJS Canvas.
Is it possible to determine whether the mouse pointer is on the Gizmo control UI?
Welcome to the Babylon community!
Hmmm currently the gizmos only have events to inform when a drag started/ended, not when is hovered. What gizmos do you want to use?
Thank you for your reply.
Most want to use
Position Gizmo / Scale Gizmo / Rotation Gizmo
There are three.
Next I want to use
Bounding Box Gizmo
is.
I just found that there isn’t an event, but there’s a boolean that shows when the gizmo is hovered! Babylon.js Playground (babylonjs.com) Would that work for you? 
Thank you!
I think I can do this!
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