Portal Cornerlink

Portal Cornerlink replaces the unpredictable vanilla portal linking with a signature system. A player places glazed terracotta blocks at the four corners of a portal frame, and the colors and their arrangement form a pattern that identifies that portal. Sixteen colors can be combined into patterns, so many distinct signatures are possible. When a player steps through a portal, the mod selects the destination portal whose corner pattern matches the most corners.

Horizontal orientation of the frame does not matter, and patterns are matched even when flipped or mirrored. Where several portals match the same number of corners, the vanilla distance priority decides between them. Without any glazed terracotta set up, the mod falls back to vanilla behavior, and it is backward compatible with existing worlds.

The mod is server-side only, so players join without installing anything, but the server must run it. It is open source under the GNU Lesser General Public License v2.1 only, and it is published for Fabric and NeoForge across 17 release versions, covering the range shown on its file list. It is a fork of an earlier project by starbidou, updated and optimized for Minecraft 1.21 with performance improvements, and the original concept and implementation remain credited to that author.