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CesiumGS / cesium-unreal

Bringing the 3D geospatial ecosystem to Unreal Engine
https://cesium.com/platform/cesium-for-unreal/
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Memory Usage Growth and SQLite Size Increase Issue in Unreal Engine 5.1 with Cesium3DTileset #1325

Open helion2017 opened 8 months ago

helion2017 commented 8 months ago

Subject: Memory Usage Growth and SQLite Size Increase Issue in Unreal Engine 5.1 with Cesium3DTileset

Issue Description: I have integrated Cesium3DTileset into Unreal Engine 5.1 with default parameters. While continuously rotating the camera using Tick, I observed a continuous increase in system memory usage, escalating from 6GB to 9GB within 10 minutes. Additionally, the size of cesium-request-cache.sqlite-wal grows from 1GB to 7GB during this time. In previous tests, the SQLite file reached 1TB within less than 24 hours, causing a memory crash. Since the camera is rotating in place, there should not be any new 3D tiles loaded. I am seeking insights into the possible causes of this issue and would appreciate any related usage recommendations.

Additional Information:

Questions:

  1. What might be causing the continuous increase in system memory usage?
  2. Why does the size of cesium-request-cache.sqlite-wal keep growing during runtime?
  3. Are there any specific usage recommendations or best practices to address this issue?

Note: I've observed similar issues in previous tests, where SQLite reached 1TB in less than 24 hours, resulting in a memory crash. Any guidance or insights into resolving this matter would be highly appreciated.

csciguy8 commented 8 months ago

Thanks for the issue and detailed observations.

What Cesium3DTileset assets are you using? Cesium World Terrain? Google P3D Tiles? Point Clouds? etc.

Could relate to these issues too.. https://github.com/CesiumGS/cesium-native/issues/739 https://github.com/CesiumGS/cesium-native/issues/664

helion2017 commented 8 months ago

Thanks for the issue and detailed observations.

What Cesium3DTileset assets are you using? Cesium World Terrain? Google P3D Tiles? Point Clouds? etc.

Could relate to these issues too.. CesiumGS/cesium-native#739 CesiumGS/cesium-native#664

Thank you for the prompt reply. Indeed, this issue seems closely related to the two mentioned above. I am working with a custom-handled oblique photogrammetry 3D Tileset, which was previously utilized in a CesiumJS project. image