Japan 3D Building Data does not switch LOD and hides the mesh

Cesium ion
1

To reduce the rendering load of the Japan 3D Building Data, I adjusted the “Maximum Screen Space Error”.

For Google Photorealistic 3D Tiles, I confirmed that the LOD changes depending on the distance from the camera. However, for Japan 3D Building Data, the meshes are hidden instead of switching to a lower LOD model.

If possible, I would like to display a less detailed model instead of having the meshes disappear entirely. Is this achievable?

Reproduction Steps:

  1. Download Cesium for Unreal Samples v2.11.0 and Cesium for Unreal v2.11.0, then extract the zip files.
  2. Create a “Plugins” folder in the root directory of the sample project and place the CesiumForUnreal plugin inside it.
  3. Open the sample project with UE 5.2 (since the sample project version is for UE 5.2).
  4. Copy “Content/CesiumSamples/Maps/01” to the “Content” folder.
  5. Open “Content/01/01_CesiumWorld.umap”.
  6. In the Outliner, select CesiumGeoreference-1, and set the following coordinates in the Details tab > Cesium section:
  • Origin Latitude: 35.65856
  • Origin Longitude: 139.745461
  • Origin Height: 60
  1. Delete CesiumWorldTerrain from the Outliner.
  2. In the Cesium tab, click Blank 3DTiles Tileset to add an empty 3DTile to the level.
  3. In the Outliner, select Cesium3DTileset0 and in the Details tab > Cesium > Ion Asset ID, input the Ion Asset ID for the Japan 3D Building Data to display it.
  4. When moving the viewpoint in the viewport, the meshes are hidden instead of changing LOD depending on the camera distance.
  5. If a value greater than 16 (default value) is entered in Cesium3DTileset0’s Details tab > Level of Detail > Maximum Screen Space Error, the meshes are hidden at shorter distances.
2

Hi @RxRDevelop,
This is a property of that particular tileset, so it’s not something that can be fixed on the Cesium for Unreal side. I’m going to move this thread to the Cesium ion forum.

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