Oh I see, you’re looking to render in the Web Mercator projection. If you happen to have a Cesium 3D Tileset where the coordinate values are in that projection, and your Unreal world uses the same projection, you should be able to render the tileset just by configuring the CesiumGeoreference Actor’s Origin Placement property to “True Origin”. But we don’t currently support - and are not likely to support in the near term - projecting other datasets like Cesium World Terrain to a flat world.