Problems with tileset occlusion

[sandwitch]

Hello. I have scene with ACesium3dTileset actor with raster overlay and a Pawn with a CameraComponent on it.

I am adding CameraComponent at the BeginPlay:

CesiumCameraManager = ACesiumCameraManager::GetDefaultCameraManager(GetWorld());|
CesiumCameraID = CesiumCameraManager->AddCamera(FCesiumCamera());|

And update it in Tick:

	FMinimalViewInfo CameraViewInfo;
	Camera->GetCameraView(FApp::GetDeltaTime(), CameraViewInfo);
	
	CesiumCameraManager->UpdateCamera(CesiumCameraID, FCesiumCamera(
		GetViewportSize(),
		CameraViewInfo.Location,
		CameraViewInfo.Rotation,
		CameraViewInfo.FOV,
		Camera->AspectRatio
	));

GetViewportSize method just returns this value:

FViewport* Viewport = GEngine->GameViewport->Viewport;
return FVector2D(Viewport->GetSizeXY());

So, here is the issue:
The tileset always culls frustum, option Enable Frustum Culling doesn’t affect anything.

This screenshot was taken with FOV 60, ConstrainAspectRatio=true, Aspect Ratio 1.0
Tileset’s enable culling volume is turned off

This screenshot was taken with same FOV 60, ConstrainAspectRatio=true, but the aspect ratio was set to 1.777778 (~16:9).

Those two screenshots had been taken with ‘Enable Frustum Culling’ to false

I also tried FOV 60, ConstrainAspectRatio=true, AspectRatio=1.777778, but the issue is still here.

I tried with and without Enable Frustum Culling option, it didn’t affect also. The only change I see is that when I press F8 and look aroung with editor’s spectator, when Enable Frustum Culling is set to true, it actually culls the tileset.

I also tried disabling ‘Constrain Aspect Ratio’ on CameraComponent of my Pawn, but it also didn’t change anything:

I tried on another level, where I put 3d tileset with ion raster overlay and DynamicPawn, and the issue was not here:

until I unchecked ‘Constrain Aspect Ratio’:

Same location with Constrain Aspect Ratio unchecked (look at bottom right) - here are holes again.

And this is dynamic pawn with FOV 90, ConstrainAspectRatio=true, AspectRatio=1.0

I am not sure if DynamicPawn tells CesiumCameraManager current aspectratio for override, but I am doing so, and I still see the holes near edges.

How can I resolve the problem?

upd: also another strange behaviour:
I tried multiplying FOV by two (to somehow ‘move’ those ‘holed’ edges), but they are still here! Why?

	CesiumCameraManager->UpdateCamera(CesiumCameraID, FCesiumCamera(
		GetViewportSize(),
		CameraViewInfo.Location,
		CameraViewInfo.Rotation,
		CameraViewInfo.FOV * 2,
		Camera->AspectRatio
	));

And also it has a OSM building on it, and the terrain is being culled incorrectly (This screenshot was taken with ‘Enable Frustum Culling’ set to False!).

[sandwitch]

forget to mention that I was using cesium 2.14.1 with Unreal Engine 5.5

[Kevin_Ring]

Hi @sandwitch,

I’m having a little trouble following you through your explanations and screenshots. To help me investigate this, can you please pick the “most obviously wrong” behavior you’re seeing, and walk me through how to set it up, starting with the Cesium for Unreal Samples project? Please also include what you’re seeing and what you expect to see.

From there, I should be able to either confirm that it’s a bug, or perhaps explain why the surprising behavior is correct and how you can work around it.

[sandwitch]

Thank you for your answer!

Sorry for inconsistent story, I read it again and I see that it was quite confusive.
The problem disappeared after I rebuilt the engine.

Now Cesium responds correctly to enabling or disabling frustrum culling feature.