After setting Cesium map and import photogrammetry of a selected city map,
Set Geo reference origin:
Set Cesium sunsky location to 000, it make the skyactor to the new geo reference point
Add 3rd person pack in UE, add player starter and change game mode to 3rd person gamemode
Place a cube as a floor under the playerstart in the scene, and:
tick Actor hidden in game in Details
Set auto possess player 0
Reminder:
Don’t change Cesium geo reference
origin once placing actors in the scene