Lock to HMD = false still results in the camera following HMD orientation (VIVE)

Development Platform & Builds XR Development
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7

For those who can compile their own engine, in UE 4.18, you can fix this in the following function in DefaultXRCamera.cpp:

void FDefaultXRCamera::PreRenderView_RenderThread(FRHICommandListImmediate& RHICmdList, FSceneView& View)
{
	check(IsInRenderingThread());

	// Disable late update for day dream, their compositor doesn't support it.
	const bool bDoLateUpdate = (TrackingSystem->GetSystemName() != DayDreamHMD);

… by setting bDoLateUpdate to false when the active Camera component “bLockToHMD” is set to false. In order to do that, I added a bUseLateUpdate in the FDefaultXRCamera class, and I set it in the ULocalPlayer::GetProjectionData(…) function, the same way UseImplicitHMDPosition is set.