Changelog

Version: 2.1.5
Date: 2026-09-07
  Features:
    - In the PvP scenario the mirror lines are put on the teams automatically, whichever
      way the scenario laid them out, so every team's quarter of the map is the same
      ground. Two teams get identical surroundings. With four, the teams opposite each
      other do, and the other pair stand in a different spot on that same ground. Other
      counts share quadrants and no pairing is exact, but every team has some shared
      terrain with some other(s). Can be turned off.
  Changes:
    - The mirror lines can be put anywhere, and each axis has its own. The single chunk
      offset, which could only place both lines the same distance west and north of the
      origin, is replaced by an east/west line setting and a north/south one. Either can
      sit on either side of the origin. A world made before this update keeps the lines
      where it had them.

Version: 2.1.4
Date: 2026-09-07
  Bugfixes:
    - The seams between chunks match now. A strip of tiles along a chunk edge could come
      out wrong, most often water where the other half has land, and stayed wrong.
    - Fulgora's ruin attractors are mirrored, so both halves of the map get them.
      Lightning rods and collectors you build yourself are left where you put them.
  Changes:
    - Demolishers are left alone: never destroyed, never copied, their territory
      untouched. The ground under one is mirrored like any other, beneath its feet.
    - A chunk waiting for its far-side partner to be generated keeps its own ground in
      the meantime, instead of being a hole in the map until the partner turns up

Version: 2.1.3
Date: 2026-09-07
  Bugfixes:
    - No longer crashes on Vulcanus when mirroring a chunk a demolisher is in
    - What you have built is no longer destroyed when a chunk is mirrored, which could
      take a PVP team's starting base with it. Both halves of the map still match.

Version: 2.1.2
Date: 2026-09-07
  Bugfixes:
    - Decoratives are mirrored. Mirrored chunks used to come out bare.
    - Changing an axis or the chunk offset during a game now takes effect, rather than
      waiting for the save to be reloaded
    - The chunk offset can no longer be set below zero
  Changes:
    - The X and Y axis setting descriptions were swapped: mirroring on X makes the east
      and west halves match, not north and south

Version: 2.1.1
Date: 2026-09-07
  Other:
    - Add a test suite

Version: 2.1.0
Date: 2026-09-07
  Other:
    - Update for Factorio 2.1
  Bugfixes:
    - No longer crashes the moment a chunk is mirrored
    - Only planets are mirrored now. Space platforms and other surfaces are left alone --
      mirroring one would have destroyed it.

Version: 1.1.1
Date: 2022-01-01
  Bugfixes:
    - Resolve publishing mistake
    - Further failure to resolve cliff cloning problems

Version: 1.1.0
Date: 2022-01-01
  Bugfixes:
    - Resolve off-by-one error on Y axis
  Optimisations:
    - Refactor some arithmetic
  Changes:
    - Bump version for Factorio 1.1

Version: 1.0.0
Date: 2020-08-14
  Changes:
    - Update for 0.18 / 1.0