Test and example of a portal in Unity qith rendered texture, custom shader and teleportation. Based on Brackey's Portal
Playable demo: https://murchelon.github.io/Portal_Unity/Portal_Unity/Build/index.html
Brackey's video on portals: https://www.youtube.com/watch?v=cuQao3hEKfs&t=698s
Other GREAT sources: http://tomhulton.blogspot.com/2015/08/portal-rendering-with-offscreen-render.html https://www.reddit.com/r/Unity3D/comments/el11vr/it_only_took_a_week_and_a_half_but_i_finally_got/ https://www.youtube.com/watch?v=ivyseNMVt-4&feature=youtu.be&t=3642
Coding Adventures Portal: https://www.youtube.com/watch?v=cWpFZbjtSQg
Shaders: https://www.youtube.com/watch?v=zCkC5e_Pkz4&list=PLX2vGYjWbI0RS_lkb68ApE2YPcZMC4Ohz