Enabling/disabling VR with SteamVR v.2

Hi everybody!

As the title says, I’m trying to enable/disable VR between different applications, and I need to do it as many times as I want. I’m working with Unity 2017.4 and SteamVR 2.0.1 (I also tried with 2.2, same behaviour).

There is a simple solution for this:

IEnumerator SwitchOutOfVr() {
        XRSettings.LoadDeviceByName(""); // Empty string loads the "None" device.
        // Wait one frame!
        yield return null;
        XRSettings.enabled = false;
}

but I got nasty exceptions since Actions and Poses don’t seem to be handled correctly after disabling VR; instead, the update functions are still called:

NullReferenceException: Object reference not set to an instance of an object Valve.VR.SteamVR_Action_Pose_Source.UpdateValue (Boolean skipStateAndEventUpdates) (at Assets/SteamVR/Input/SteamVR_Action_Pose.cs:571) Valve.VR.SteamVR_Action_Skeleton_Source.UpdateValue (Boolean skipStateAndEventUpdates) (at Assets/SteamVR/Input/SteamVR_Action_Skeleton.cs:904) Valve.VR.SteamVR_Action_Skeleton.UpdateValue (Boolean skipStateAndEventUpdates) (at Assets/SteamVR/Input/SteamVR_Action_Skeleton.cs:65) Valve.VR.SteamVR_Input.UpdateSkeletonActions (Boolean skipSendingEvents) (at Assets/SteamVR/Input/SteamVR_Input.cs:355) Valve.VR.SteamVR_Input.LateUpdate () (at Assets/SteamVR/Input/SteamVR_Input.cs:269) Valve.VR.SteamVR_Behaviour.LateUpdate () (at Assets/SteamVR/Scripts/SteamVR_Behaviour.cs:219)

I’d like to know if I’m doing something wrong or it’s something that will be fixed. Thanks in advance for any hint.

[zite]

Yeah, being able to disable steamvr seems like a reasonable request. I’ll add it to the feature request list.

[JorgeZubog]

Hello, I have exactly the same problem, I need enabling/disabling VR as many times as the player wants, however in the second time I get the same errors and in the application build I lose the controllers tracking. I’m working with the player prefab, I have the current plugin version 2.5.0 (sdk 1.8.19) and SteamVR 1.8.20 version.

I’ll be very glad with any help 😃

This is my code:

IEnumerator EnableVR(bool enable)
    {
        // ** ENABLE VR **
        if (enable)
        {
            mainCamera.SetActive(false);

            if (string.Compare(XRSettings.loadedDeviceName, "OpenVR", true) != 0)
            {
                XRSettings.LoadDeviceByName("OpenVR");
                yield return null;
            }
            XRSettings.enabled = true;

            yield return null;

            player.SetActive(true);

            print("Enabling VR ...");
            SteamVR.Initialize(true);
        }
        // ** DISABLE VR **
        else
        {
            player.SetActive(false);

            print("Disabling VR ...");
            Destroy(FindObjectOfType<SteamVR_Behaviour>());
            XRSettings.LoadDeviceByName(""); // still needed to release the Vive
            yield return null;

            XRSettings.enabled = false;
            yield return new WaitForSeconds(2);

            mainCamera.SetActive(true);
        }


    }

This are the errors:

NullReferenceException: Object reference not set to an instance of an object
Valve.VR.SteamVR_Action_Pose_Source.UpdateValue (System.Boolean skipStateAndEventUpdates) (at Assets/SteamVR/Input/SteamVR_Action_Pose.cs:575)
Valve.VR.SteamVR_Action_Skeleton_Source.UpdateValue (System.Boolean skipStateAndEventUpdates) (at Assets/SteamVR/Input/SteamVR_Action_Skeleton.cs:917)
Valve.VR.SteamVR_Action_Skeleton.UpdateValue (System.Boolean skipStateAndEventUpdates) (at Assets/SteamVR/Input/SteamVR_Action_Skeleton.cs:65)
Valve.VR.SteamVR_Input.UpdateSkeletonActions (System.Boolean skipSendingEvents) (at Assets/SteamVR/Input/SteamVR_Input.cs:355)
Valve.VR.SteamVR_Input.LateUpdate () (at Assets/SteamVR/Input/SteamVR_Input.cs:269)
Valve.VR.SteamVR_Behaviour.LateUpdate () (at Assets/SteamVR/Scripts/SteamVR_Behaviour.cs:230)

NullReferenceException: Object reference not set to an instance of an object
Valve.VR.SteamVR_ActionSet_Manager.UpdateActionStates (System.Boolean force) (at Assets/SteamVR/Input/SteamVR_ActionSet_Manager.cs:57)
Valve.VR.SteamVR_Input.UpdateVisualActions (System.Boolean skipStateAndEventUpdates) (at Assets/SteamVR/Input/SteamVR_Input.cs:315)
Valve.VR.SteamVR_Input.OnPreCull () (at Assets/SteamVR/Input/SteamVR_Input.cs:302)
Valve.VR.SteamVR_Behaviour.PreCull () (at Assets/SteamVR/Scripts/SteamVR_Behaviour.cs:219)
Valve.VR.SteamVR_Behaviour.OnBeforeRender () (at Assets/SteamVR/Scripts/SteamVR_Behaviour.cs:189)
UnityEngine.BeforeRenderHelper.Invoke () (at C:/buildslave/unity/build/Runtime/Export/Graphics/BeforeRenderHelper.cs:92)
UnityEngine.Application.InvokeOnBeforeRender () (at C:/buildslave/unity/build/Runtime/Export/Application/Application.cs:318)