Get zoom value when zoom is changed in Forge Viewer

Question

I need to show some Sprites when the camera gets close to a building and when the camera zoom out, remove the Sprites.

Is there any event that triggered when zoom changes? Also, How can we get the current zoom value?

Answer 1

There is an event trigerred when Camera changes (included zoom) :

viewer.addEventListener(Autodesk.Viewing.CAMERA_CHANGE_EVENT, (e) => {
    console.log(e)
})

There is a zoom property in the event received. You will additionally find a lot of informations