related to this thread.
recently I tried some my shabby code with Unity and result is not good 
I found that making google earth style camera is difficult to me.
as you guys know, for Cesium for Unity there is no screen space controller for camera.
I found that for Cesium for Unreal. there is screen space controller for globe camera PR and it is merged into the repository.
if there is someone who trying to implement this. check these code and video. if you succeed to implement this, please upload PR for Cesium for Unity Community I will be happy for it 
