UE5.1OpenWorld&CesiumForUnreal Test

yuan1405 · March 3, 2023, 7:17am

test:

Error(Some times):

Fatal error
[File:E:ue5\5.1\newue5.1\UnrealEngine-5.1\Engine\Source\Runtime\CoreUObject\Privatel\Templates\Casts.cpp] [Line: 10]
Cast of Cesium3DTileset
Game/Test/OpenWorld4/NewMap4.NewMap4:PersistentLevel.Cesium3DTileset_AID_D85ED359AEFACB6B01_1397881888 to MetaData failed

Maybe WorldPartiton and CesiumForUnreal can work together well，however i have some problem can’t solve, Some puzzlement about big terrain: Cesium has been a earth level, then big terrain based on WorldPartiton?emmm

yuan1405 · March 3, 2023, 8:49am

Like Cesium3DTile is not a entity object in unreal, so output log：

LogWorldPartition: Actor /Game/Test/OpenWorld4/NewMap4.NewMap4:PersistentLevel.Cesium3DTileset_UAID_D85ED359AEFAE36B01_1115473107 is unreachable without properly detaching object /Game/ExternalActors/Test/OpenWorld4/NewMap4/7/TA/D6CY3VPUZCJM6A4RHDTA1Y.PackageMetaData in it package

Kevin_Ring · March 3, 2023, 9:29am

@yuan1405 Cesium for Unreal does not currently support World Partition. I don’t think it makes very much sense to let world partition manage the world overall, because it is inherently based on a 2D grid, and the Earth is round. But there may be some ways to apply it that do make sense, such as using it to manage a sub-level in a particular local area. We have several issues related to this, and plan to dig deeper soon:

github.com/CesiumGS/cesium-unreal

World Partition resulting in editor crash with Cesium

opened 05:53PM - 12 Aug 22 UTC

closed 05:39PM - 31 May 23 UTC

argallegos

bug

Observed here: https://community.cesium.com/t/ue5-crash-when-editing-deleting-sa…ving-cartographic-polygon/19824 User reported that saving a scene while both World Partition and the Cesium for Unreal plugin resulted in a crash. While Cesium for Unreal is not compatible with World Partition, this should probably not be resulting in a crash. The user first noticed this issue when attempting to save a scene after adding a Cartographic Polygon. They provided this log: `Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\Templates\Casts.cpp] [Line: 10] Cast of CesiumCartographicPolygon /Game/Seattle_Project/Levels/Cesium-BingMapAerial.Cesium-BingMapAerial:PersistentLevel.CesiumCartographicPolygon_UAID_3CECEF77A2E62E2901_1946255554 to MetaData failed` I am unable to reproduce this on my machine. However, the user has experienced it on multiple machines, in multiple projects, including fresh projects. All the user's machines are using RTX3090 GPUs.

github.com/CesiumGS/cesium-unreal

UE5 - 3D Tiles Don't Load/Unload Correctly with Data Layers/World Partition

opened 04:30AM - 18 May 22 UTC

darcyvdd

bug

I have some Cesium3DTilesets on different levels, for the project we are already… utilising Data Layers for different design options within the level. To make this work seamlessly we have different 3D Tiles that are the same terrain but utilise different CesiumCartographicPolygons to cutout precisely around the design and fill-in different areas. We utlisising Data Layers to load/unload the design however the 3D Tiles fail to unload despite being on the DataLayer. It should be noted the if we load/unload the DataLayers in editor, the 3DTiles load/unload appropriately, but in PIE or a packaged build it does not work correctly.

github.com/CesiumGS/cesium-unreal

UE5 Support: Explore alternatives to georeferenced sublevels

opened 03:22PM - 19 Jan 22 UTC

closed 05:08PM - 05 Jul 23 UTC

nithinp7

research

In UE4, we used world composition to enable georeferenced sublevels. World compo…sition is typically used to arrange sublevels on a grid so they can be loaded in or out based on where the player is on the grid. But in our case we always spawn the sublevels at the Unreal origin so we didn't need this feature. We only used world composition to explicitly tell the level streaming system that these sublevels are _not_ to be streamed in according to distance, instead our georeference system should control when levels should be loaded from C++. In UE5, world composition has been removed and replaced with world partition. There is also a level instancing feature which can be used outside of a world partition system as long as a custom streaming management logic is provided, this sounds like exactly what we want ([reference here](https://docs.unrealengine.com/5.0/en-US/WorldFeatures/WorldPartition/LevelInstancing/)). Level instancing also adds the ability for levels to have arbitrary transforms and since this is UE5 I assume these transforms can be in double precision. In some cases, this _may_ remove the need for the georeference origin changing that currently happens when switching levels, but for the foreseeable future it will usually be more convenient to spawn sublevels at the origin and change the georeference. In general, we should investigate if it would be possible to have the Unreal coordinate system directly represent ECEF. If so, we should provide that as an alternative option to using the georeference system. This includes providing alternative code paths for Cesium objects to be correctly located when UE coordinates represent ECEF.** **Technically UE coordinates will be left-handed, Z-up, and in centimeters, so not exactly ECEF, but equivalent up-to a simple conversion transform.

Topic		Replies	Views
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Creating a Google Earth-like Application in Unreal Engine with Cesium and Metadata Integration Cesium for Unreal	4	108	December 18, 2024
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UE5.1OpenWorld&CesiumForUnreal Test

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