GeoJSON Layer Fails to Load on Freshly Booted OpenHarmony Devices in CesiumUnity

[Astral-Yang]

What happened?

When using CesiumUnity, the GeoJSON layer fails to load on OpenHarmony devices immediately after the device has been freshly started.

Expected Behavior:

The GeoJSON layer should load correctly after the application starts, regardless of device uptime.

Actual Behavior:

• Right after device boot, the GeoJSON layer fails to load.
• If the device remains on for some time (maybe 2 days or longer) and the app is launched later, the GeoJSON layer loads successfully.
• After rebooting the device again, the issue reoccurs.

Additional Notes:

• This behavior appears to be related to the device state shortly after boot. Since OpenHarmony devices are relatively uncommon outside mainland China, we would appreciate any general guidance on how to diagnose this issue, as well as possible directions for fixes or workarounds. At this stage, it is unclear whether the root cause lies in CesiumNative, Unity, or other system-level factors.

Environment

Cesium for Unity version: 1.23.0
Unity Editor Version:Unity 2022 LTS
Operating System:OpenHarmony

Reproduction steps

1. Reboot an OpenHarmony device.
2. Launch the application that uses CesiumUnity.
3. Attempt to load a GeoJSON layer.

Supporting evidence

No response

[j9liu]

Hi @Astral-Yang, sorry for the delayed response.

I'm not sure what could be going wrong, but it would help to have some examples of GeoJSONs that do or do not work. If you can test the following:

1. Start from 01_CesiumWorld in cesium-unity-samples
2. Add the tileset and GeoJSON raster overlay from this Sandcastle to the scene. Make sure the GeoJSON raster overlay is on Cesium World Terrain.
3. Double-click the tileset to zoom to its location. Then, toggle the visibility so you can see the GeoJSON raster overlay underneath.

Let us know how that goes so we can try to troubleshoot from there!

[Astral-Yang]

Hi @Astral-Yang, sorry for the delayed response.你好，抱歉回复晚了。

I'm not sure what could be going wrong, but it would help to have some examples of GeoJSONs that do or do not work. If you can test the following:我不确定哪里出了问题，但如果能提供一些 GeoJSON 的示例会很有帮助。如果你能测试以下内容：

1. Start from 01_CesiumWorld in cesium-unity-samples从铯-单位-样本中的 01_CesiumWorld 开始
2. Add the tileset and GeoJSON raster overlay from this Sandcastle to the scene. Make sure the GeoJSON raster overlay is on Cesium World Terrain.把这个沙堡的瓦片集和 GeoJSON 栅格覆盖层添加到场景中。确保 GeoJSON 栅格覆盖层位于 Cesium World Terrain 上。
3. Double-click the tileset to zoom to its location. Then, toggle the visibility so you can see the GeoJSON raster overlay underneath.双击该图块集可缩放到其位置。然后切换可见性，这样你就能看到下面的 GeoJSON 光栅覆盖层。

Let us know how that goes so we can try to troubleshoot from there!告诉我们进展如何，我们好好从那里开始排查！

Thank you for your reply. I identified the issue yesterday: the Blend2D C++ library does not function properly on freshly started HarmonyOS devices. Certain functions, such as fillPath and clearAll, return an error code of 65538. This issue has already been reported to Huawei HarmonyOS. Do you have any suggestions regarding this?