In my current project, if I enable VR the GUI doesn’t show up, but when VR is disabled the GUI shows up. I have tried the main camera and using the OVR prefab, with GUI layer component on the camera.
edit: still looking for an answer here. Is onGUI no good with VR? This must be it Displaying a GUI Label using the Oculus Rift - Unity Engine - Unity Discussions
I have an asset from the asset store that uses onGUI, will not work with VR…
I am sure you might have figured this out by now! But I am still posting this for anyone who tries to find an answer to this.
In case of VR, OnGui() and Canvas with screen space overlay wont work. Reason behind this is in case of VR there is no 2D screen type of interaction available. The user is spawned inside the 3D world and has to click on a button using the Reticle (The center of the user’s vision). So imagine if the UI is drawn on screen like in case of OnGui, when the user moves his head to point at something, the UI will also move along with it and will never be accessible.
Check this link about design principles related to VR: https://unity3d.com/learn/tutorials/topics/virtual-reality/interaction-vr