OculusBoundaryComponent crashes when no HMD connected

Development Programming & Scripting
1

If using OculusBoundaryComponent, but no HMD is connected and Vive is also setup but not turned on (so it runs an inactive SteamVR). Oculus BoundaryComponent crashes in OnTick:

The fix is to check that the XRSystem is valid:

if (GEngine->XRSystem.IsValid())

So the code now looks like this:

void UOculusBoundaryComponent::TickComponent(float DeltaTime, enum ELevelTick TickType, FActorComponentTickFunction *ThisTickFunction)
{
	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);
#if OCULUS_HMD_SUPPORTED_PLATFORMS
	FOculusHMD* OculusHMD = nullptr;
	if (GEngine)
	{
		if (GEngine->XRSystem.IsValid())
		{
			OculusHMD = (FOculusHMD*)(GEngine->XRSystem->GetHMDDevice());
		}
	}

	if (OculusHMD && OculusHMD->IsHMDActive())

In OculusBoundaryComponent.cpp

2

Hello,

Could you please provide the contents of the call stack when you receive this crash. Also for clarification, is this happening in a new project or is this from a project that you have upgraded from 4.17.

Thank you.

3

It’s an upgraded project, haven’t tested it with a fresh one. I’ll test and send the call stack.

I’ve pull requested the fix. https://github.com/EpicGames/UnrealEngine/pull/4165

4

Callstack having reverted my fix:

link text

5

This occurs when running up into the editor after the VR system initialises.
To make it go wrong, run with SteamVR system installed but with the HMD/Sensors turned off. I also have an Oculus installed but not connected.

6

Hey Jimsnomis,

So I was able to reproduce a similar bug with this where my 4.18 projects would crash the moment I added the boundary component with no HMD connected. 4.17 I was having no issues what so ever. I have created a bug report for the crash I was receiving and linked yours in as well as a related issue.

You can follow the bug report here UE-52092

In time this should resolve both of the issues, one with your OnTick crash and the adding boundary component crash.

Thank you.

7

Great thanks!