My app runs well on PC, but crashes on Android

Development Platform & Builds Mobile
,
1

2017-07-14_105642.png
2017-07-14_105642.png1920×1032 182 KB

I’m currently learning UE4 and I’ve written a small demo that draws different colorful shapes where the bullets hit. The demo runs well on PC, but when I installed it on Android it crashed immediately when the bullet hit the wall. I tried debug it with Nsight Tegra Debugger, the only information I got is “Execution of the target program is stopped for unknown reason.”, I doubt weather it’s a bug of UE4 or mine mistake , anyone can help ? Thanks in advance. The source code is in the attachment without Content resources.

2

Hello ,

Could you please provide the full log from the device that this crashed on, as well as the full callstack?

3

The full callstack is in the attachment, right after void AColorPainter::Paint(const FHitResult& Hit) returns, thanks.

4

Hello ,
I’ve upload the full project to github: .com/comfanter/AndroidProject.git

5

I made a small modification to the engine source.

//Engine\Source\Runtime\Engine\Classes\Components\PrimitiveComponent.h



 	UPROPERTY(EditAnywhere, AdvancedDisplay, BlueprintReadWrite, Category=Collision)
	uint32 bReturnFaceIndexOnMove:1;

//Engine\Source\Runtime\Engine\Private\Components\PrimitiveComponent.cpp



void UPrimitiveComponent::InitSweepCollisionParams(FCollisionQueryParams &OutParams, FCollisionResponseParams& OutResponseParam) const
{
	OutResponseParam.CollisionResponse = BodyInstance.GetResponseToChannels();
	OutParams.AddIgnoredActors(MoveIgnoreActors);
	OutParams.AddIgnoredComponents(MoveIgnoreComponents);
	OutParams.bTraceAsyncScene = bCheckAsyncSceneOnMove;
	OutParams.bTraceComplex = bTraceComplexOnMove;
	OutParams.bReturnPhysicalMaterial = bReturnMaterialOnMove;
	OutParams.bReturnFaceIndex = bReturnFaceIndexOnMove; // new
	OutParams.IgnoreMask = GetMoveIgnoreMask();
}

The app crashes on Android when the bullet hits the ColorPainterBP Actor.

6

Thank you for the log and callstack. It seems like it may be related to this warning message:

[2017.07.14-02.48.48:770] 0]LogStaticMesh:Warning: [SM_Plane1000_512] Mesh has more that 65535 vertices, incompatible with mobile; forcing 16-bit (will probably cause rendering issues).

Could you try simplifying this plane mesh or replacing it with a mesh that has less vertices? This is likely the issue if your painting is on this mesh.

7

Thanks for your reply. I removed SM_Plane1000_512 but it still crashed when I tried to paint on mesh 1v4_tieta_jz_tieta003_lyz.

8

Hello ,

I apologize for the delay, a bit busy at the moment but I just wanted to let you know that I’m still looking into this. I’ll likely get some time to look into it tomorrow.

9

Actually, something I just noticed is that Event Driven Loading is enabled. Can you try disabling that and see if it may help? It’s known to cause some Async loading issues.