Switching between viewports causes strange behavior with ARVRInterface's initialize / uninitialize about godot_openvr HOT 5 OPEN

Sorry for the very very late reply.

The viewport not returning to a normal viewport after ARVR is turned off sounds like an issue in Godot itself, it is supposed to adjust the size and everything automatically.

What do you mean by uninitialising and re-initialising? If you uninitialise the interface that shuts down openvr completely and is very wasteful. Or do you simply mean switching which viewport is set as the ARVR viewport?

You can't have more then one viewport set as the ARVR viewport at any given time so if removing the ARVR status on a viewport is causing issues that might result in problems.

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No worries!

Make sense - I'll report the viewport size issue to Godot.

I can see how it's wasteful, but I think it might still be sensible in our case: Our program is usually controlled traditionally with mouse and keyboard, VR is only turned on sometimes to view the landscape from VR. It's plausible to have long times between that where VR is turned off, so that's where we'd want to uninitialize the interface. Or should we leave the interface initialized and only remove all VR nodes and ARVR viewports?

If I recall correctly, uninitializing and initializing could actually drop the FPS permanently, and there was also the crash mentioned above that happened sometimes when calling uninitialize. Would a small example project be of use, or is uninitializing not really something we should do anyways?

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Hi. have you found any solutions? I'm having same issue. After switching arvr to false image gets distorted/stretched... :(

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@milmarg Unfortunately not... also, it seems like OpenXR in Godot 4.0 assumes even more strongly that VR is either consistently enabled since startup or consistently disabled (see https://docs.godotengine.org/en/latest/tutorials/xr/setting_up_xr.html#openxr). So it seems like the only workaround is to make a full restart for enabling/disabling VR as painless as possible (this is what we ended up doing).

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I found a workaround: bumping the viewport's size around seems to fix it (desktop Windows, Android native, web). Running 3.5.1.

Here is my full exit vr method (verified working in 3.5.3 also):

func exit_vr():
	var interface = ARVRServer.find_interface("Native mobile")
	interface.uninitialize()
	get_viewport().arvr = false
	$"%Camera".current = true

	# hack to get 2D viewport to return to normal...
	var vs = get_viewport().size  # get the actual size
	get_viewport().size = vs - Vector2.ONE  # bump it (make something refresh?)
	get_viewport().size = vs  # restore it to the actual value
	
	vr_active = false

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