Just downloaded the latest Google Cardboard SDK for Unity from here: https://developers.google.com/vr/unity/download
All the tutorials I have seen (including Google's own) talk about dragging the GvrViewerMain prefab into the Hierachy. However, I have searched all the google VR assets included in the download and GvrViewerMain is not present. Anyone know where I can download this from or which Prefab to use instead?
According to the Google VR SDK for Unity v1.50 release note, this version and any other version above it removed GvrViewerMain.
It has been replaced with GvrEditorEmulator.
You can find this in GoogleVR/Prefabs/GvrEditorEmulator.prefab.