Hello everyone,
I have generated elevation and texture tiles using Cesium Terrain Builder. However, when I try to load the elevation tiles into Unreal Engine 5 using the Cesium plugin (offline), I encounter an error. The error message states that there is a format issue in the tileset.json, but it does not provide further details.
We have verified that Unreal Engine is reading the tileset.json file and that it is correctly locating the /0/0/0.terrain file. Despite this, the tiles fail to load properly.
Could you clarify the correct procedure for loading custom elevation tiles in Unreal Engine 5 with the Cesium plugin in an offline setup? Are there any specific format requirements or configurations that we might be missing?
Thank you for your help!
Best regards,
Paloma
Hi @Paloma_Manzano, welcome to the community!
Despite the trademark violation, Cesium Terrain Builder is not a Cesium product. Our solution for terrain tiling is Cesium ion.
Please share the exact error message you’re getting. It’s useful to know the version of Cesium for Unreal you’re using as well. It’s unusual that you have a tileset.json and also .terrain files. Usually, .terrain files are paired with a layer.json file, while a tileset.json would refer to .b3dm or .glb files.
It may be useful to try loading this tileset in CesiumJS as well. If you can’t get it to load there, that would be a strong indication that there is something wrong with Cesium Terrain Builder’s output.
Hi Kevin,
First of all, I’d like to apologize for using a product that is not officially part of Cesium. I wasn’t aware of that, and my only goal is to find a way to load elevation tiles offline in Unreal Engine 5.
I need a solution where the tiles are stored locally on the machine where they are used, without requiring Kubernetes or any other external infrastructure. The tiles must be generated in a controlled manner and loaded directly from local storage. If Cesium ion provides a way to achieve this, could you explain how it works?
Additionally, do you have any offline tools or resources for testing terrain tiles? Online solutions are not a viable test option for my use case.
Regarding my setup, while my file is named tileset.json, I am serving it locally via a port, so the filename itself shouldn’t be an issue. What truly matters is the correct structure of the dataset. Where can I find documentation on how to properly structure terrain tiles for use with the Cesium plugin in Unreal Engine?
For reference, the error message I see in the console is:
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LogCesium: Loading tileset from URL http://localhost:8070/tileset.json
LogCesium: Loading tileset from URL http://localhost:8070/tileset.json done
LogCesium: Error: [2025-02-11 14:00:08.240] [error] [TilesetJsonLoader.cpp:735] Error when parsing tileset JSON, error code Invalid value. at byte offset 0
I want to clarify that the issue is not with reading the JSON file itself. When we intentionally introduce errors into the JSON, we receive a different error message, indicating that the file is being read correctly.
Thank you for your time and assistance!
Best regards,
Paloma