Nether portals need to be spaced at least 128 blocks apart in the Overworld to avoid linking to the same Nether portal, and spaced at least 16 blocks apart in the Nether to be recognized as distinct portals. This spacing ensures they do not link to each other improperly. The game searches within a radius of 128 blocks in the Overworld or 16 blocks in the Nether to find the closest portal to link to, so keeping this minimum distance prevents overlap.
Key Details:
- The Nether is scaled down by a factor of 8 compared to the Overworld (i.e., 1 block in the Nether corresponds to 8 blocks in the Overworld).
- If two Overworld portals are closer than 128 blocks, they might link to the same Nether portal.
- If two Nether portals are closer than 16 blocks, they might link to the same Overworld portal.
- Properly aligning the coordinates by dividing Overworld coordinates by 8 and matching Nether coordinates helps achieve correct linking.
This means to avoid linking, make sure your portals are spaced so that the corresponding positions in each dimension do not fall within these ranges.
