An up-to-date tutorial teaching you how to make a real-time reflective surface in Unity 3D without using render textures, reflection probes, multiple cameras or any other unnecessary textures. You will need a special shader and a script; all of which are available in the following ZIP file:
https://ouo.io/J997rL (password: mindflux)
ALT link: dailyuploads.net/1irucldqd1gv
ALT2 link: https://mshare.io/file/SVWHJXOB