I am currently working on a project using Cesium for Unreal, and I am encountering an issue related to georeferencing and world behavior over large distances.
In my setup, I have defined a Cesium Georeference with a fixed origin. When the camera or an actor moves significantly far away from this reference point (for example, along the equator), the environment no longer appears locally flat. Instead, the Earth’s curvature becomes visibly noticeable, and the scene appears to tilt or rotate. It gives the impression that the Earth is no longer aligned consistently, and that we are reaching a “corner” or edge of the world.
From a technical perspective, I understand that this behavior may be due to the transition from a local tangent plane approximation to the true ellipsoidal shape of the Earth (WGS84). However, this introduces challenges for our use case, where we need the environment to behave consistently from the perspective of the camera or actor, without noticeable changes in orientation or “up” direction.
Specifically, I would like to ask:
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Is this behavior expected due to Cesium’s use of a georeferenced ellipsoid model?
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Is there a recommended way to maintain a locally flat experience over large distances?
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Are there any Cesium Georeference settings (such as origin rebasing or other properties) that can minimize or eliminate the perceived rotation/tilting?
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What is the best practice for handling actor movement and orientation when traversing large areas of the globe?