Tunneling shader based on Daydream Elements by Google, Inc. Made for Godot 4.0, currently in alpha. See documentation here: https://developers.google.com/vr/elements/tunneling Original Unity source code downloaded from here: https://github.com/ChristophGeske/ARCoreInsideOutTrackingGearVr/blob/master/VuforiaTracking(Experimental)/Assets/DaydreamElements/Elements/Tunneling Does not currently support the cage shader.