It’s similar to that.
The problem with your video is that you look down (as isometric) so the transition doesn’t appear to do its effect properly.
If you look ahead it doesn’t work, because you see the map load “instantly” every x meters.
What I’m looking for is 99% this “seamless teleportation”
1 - Load the map
2 - Appear as a mirror
I’ll see if I can replicate the same effect as the “seamless teleportation”.