One thing to keep in mind is that when working with vertical portals it is very important to take into account the y height of all portals involved.
Nether roof portal height.
It won t look above y127.
I can give an example with specific coords if you need as ive got this on my server.
Now the upper portal should link to the nether roof and the lower one should take you to the actual nether.
If you manage to build a portal on top of the nether roof you can teleport away back to the overworld but you can t teleport into that roof portal from the overworld because the game doesn t look for nether portals on top of the nether roof.
118 for the nether or 246 for the overworld.
To be valid the area needs to have a flat solid ground and enough space to accomodate the destination portal.
A nether portal on either aide will connect to whichever portal its closest to and that includes on the y axis.
Want your nether hub on top of the nether.
How to get nether ceiling portals that work to from the overworld in minecraft 1 15 in both directions in todays.
When a portal is forced in this way a 2 3 platform of obsidian with air 3 high above is created at the target location overwriting whatever might be there.
To create the portal the player must first build a rectangular obsidian frame ranging in size from a minimum of 4 5 to a maximum of 23 23.
A new trick using nether portal to get above the nether bedrock ceiling.
If that fails too a portal is forced at the target coordinates but with y constrained to be between 70 and 10 less than the world height i e.
Only in the rare care of no valid area being available in the general neighborhood of your destination will minecraft use your current height as the generated portal height and only if it s in the 70 118 range above sea level.
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It can be easy to get lost in the infinite bedrock on top of the nether especially if your portals are far apart.
I just got onto the bedrock nether roof all excited and boom hight limit wth.
For those that don t know there is a build height limit on bedrock edition so if you glitch or break through the bedrock roof in the nether you cannot place blocks above it.
Very useful for nether hub and bases.