Google Tiles disappearing after some time

MichelNO · November 18, 2023, 2:35pm

All works fine with the packaged version. After some time, wich varies a lot, tiles start to disappear.
Any thougts on how to fix this?

Kevin_Ring · November 20, 2023, 2:56am

We haven’t seen that, and I don’t know offhand what might cause it. Can you reproduce it in the Cesium for Unreal Samples project? Can you tell us more about the conditions in which it happens? After camera movement? Or do tiles just disappear with the camera stationary?

MichelNO · November 20, 2023, 3:19pm

@Kevin_Ring When there is no inputs the camera get in a very smooth movement in Z axis rotating to a limit of 10º and back. At some point the tiles start to disappear, sometimes after an hour sometimes after 4 hours. There is no time pattern.

Brian_Langevin · November 20, 2023, 5:29pm

Did you see any errors in the log when this happens?

Can you post your log?

Might be related to this ticket…

github.com/CesiumGS/cesium-native

Google-compatible token refresh

opened 03:57AM - 03 Nov 23 UTC

kring

research

The Google Photorealistic 3D Tiles documentation page (https://developers.google….com/maps/documentation/tile/3d-tiles) says: > The render can make at least three hours of tile requests from a single root tileset request. After reaching this limit, you must make another root tileset request. cesium-native should handle this possibility. Currently, when we see a 403 for a tile in a tileset from Cesium ion, we will re-request the Cesium ion `asset/endpoint` service and adopt the new key that it returns. But this won't help with the Google tileset, because the `asset/endpoint` doesn't contain a key of that type. Instead, the key is embedded in the root tileset.json URL, and we have to request _that_ in order to get a new session. Furthermore, it's possible to load the Google tiles directly from Google rather than going through Cesium ion, and in that case no attempt will be made to refresh the session at all. So we should investigate our options for handling the need to refresh Google sessions. Ideally, the solution would be generally applicable to tilesets from other providers, too, and wouldn't need to encode any Google-specific logic. One option, for example, is to do a full tileset refresh (unload everything and start over) whenever we see a 403 and its either not a Cesium ion tileset, or the normal Cesium ion token refresh procedure doesn't work. But there are probably better options.

MichelNO · November 21, 2023, 11:24am

Hi @Brian_Langevin yes it is. The workaround for us was to set a refresh every hour since there wasn´t a time pattern for the problem to happen.
Thank you all.

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Google Tiles disappearing after some time

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