enable & disable VR on mobile

VRSettings.enabled Globally enables or disables VR for the application.

Set this to true to enable VR mode for the application. Note that this does not activate VR mode. VR mode is activated when a supported Head Mounted Display (HMD) is connected. The GearVR cannot be disabled once activated. A warning message is shown when attempting to disable a GearVR device.

Include using UnityEngine.VR; at the top.

Call VRSettings.LoadDeviceByName("") with empty string followed by VRSettings.enabled = false; to disable VR in the start function to disable VR.

When you want to enable it later on, call VRSettings.LoadDeviceByName("deviceName") with the VR name followed by VRSettings.enabled = true;.

You should wait for a frame between each function call. That requires this to be done a corutine function.

Also, On some VR devices, you must go to Edit->Project Settings->Player and make sure that Virtual Reality Supported check-box is checked(true) before this will work. Then you can disable it in the Start function and enable it whenever you want.

Note:

This is known to work on some VR devices and not all VR devices. Although, it should work on Daydream VR. Complete code sample:

 IEnumerator LoadDevice(string newDevice, bool enable)
 {
     VRSettings.LoadDeviceByName(newDevice);
     yield return null;
     VRSettings.enabled = enable;
 }
 
 void EnableVR()
 {
     StartCoroutine(LoadDevice("deviceName", true));
 }
 void DisableVR()
 {
     StartCoroutine(LoadDevice("", false));
 }

According to Unity, it wont work in the Editor. It will work in Standalone builds.

You can't just write

 VRSettings.enabled

It's a variable that has a value that you can change. More specifically: To true or false. So your VR-enable code is

 VRSettings.enabled = true;

and accordingly, disabling VR would be

 VRSettings.enabled = false;