Native mod by keksi2k

Horizonmatica

Litematica for Horizon: schematics as ghost blocks, a verifier, material lists and a printer that builds the missing blocks for you.

No ratings yet2.8k downloadsVersion 0.3.2MIT

Made by keksi2k. Its authors own it and answer for it. Not made or endorsed by the Horizon project. Mod policy

Horizonmatica is a re-creation of Litematica (with its printer) for Horizon. Load a schematic, see it as ghost blocks in your world, check your build against it, get a material list, and let the printer place the missing blocks.

Features

Formats: .litematic (versions 1–7, several regions), .schem (Sponge v1–v3: WorldEdit, FAWE, Amulet, Axiom), .schematic (MCEdit / WorldEdit up to 1.12) and vanilla structure .nbt. Older files are upgraded with Horizon's data fixer, the same way old worlds are.
Overlay: missing blocks as translucent real block models (chests, banners, heads and other block entities included), optionally visible through walls.
Verifier: wrong block (red), wrong state (orange), extra block (pink), plus a progress HUD.
Layers: all / one layer / above / below / range.
Placements: several at once; move, rotate, mirror, show or hide each; a move mode for mouse wheel and arrow keys. The placements are remembered per world and dimension and restored when you join again.
Save your own: select an area with the selection tool (a stick: left and right click set the corners, the wheel grows and moves the box) and save it as a .litematic (blocks and their states), chunk by chunk as in Litematica: chunks not loaded yet show as frames to fly to.
Material list: missing, total and carried, with item icons, in the HUD or in the menu, and copied to the clipboard as a table for spreadsheets.
Menu (M): a screen of its own, drawn with the game's widgets.
Pick block: middle-click a ghost block to take that block in hand, for building by hand.
Highlights: mark missing and wrong blocks through everything, however far away, for all items or just one you pick in the material list.
Printer: places one missing block within reach every few ticks, from the bottom up. It only clicks when Horizon's own placement logic says the click produces exactly the wanted state (stairs, slabs, logs, furnaces…). Redstone-aware order, repeater, comparator and note block setup after placing, double slabs and stacks, chests, falling blocks. The camera never moves.

Usage: put schematics into schematics/ next to options.txt of your instance (/hm folder shows the path), then /hm load <name> or press M. All commands and keys are in the README.

What it does and doesn't do

Reads only files in the instance's schematics/ folder, and creates that folder if it's missing.
Writes only the .litematic files you save (/hm save), into that folder. Settings and remembered placements go through Horizon's mod settings.
Network: no connections of its own. The only thing sent to a server is what the printer does: the same block-placing clicks a player would make (with the matching look direction), and hotbar slot changes.
"Open folder" in the menu opens the schematics folder in your file manager through Horizon's own function.
No telemetry, no downloads, no code run from schematic files. Schematics are parsed as data only.

⚠️ On other people's servers, automatic placing may break the rules or trip anti-cheat. The printer is off until you turn it on (K or /hm printer on). Its air place option (off by default) is noticed by anti-cheat plugins such as Grim.

Version: native mods use game internals, so Horizonmatica is pinned to one Horizon commit (currently Nightly 2026-11-04, 67dad0d). A new Nightly needs a new release.

Credits

The idea, the way it's used, the file format and the behaviour come from Litematica by masa (maruohon), maintained by Sakura-Ryoko, and from Litematica Printer by aleksilassila. Horizonmatica is not an official project of these authors, isn't made or endorsed by them, and contains none of their code. Only the file format and the behaviour are re-created. If you like it, go and support the originals.

Menus built with horizon-menus. MIT licensed.

Native code

A native mod is Rust code that the launcher compiles into a game of its own, the Native mods instance. It is not sandboxed: it can do anything you can on this computer. The launcher builds it only after a warning that names it, and a reviewer read its source before it was listed. Read the source yourself before you build it. How native mods work

Versions

0.3.22026-11-08 · for Minecraft 26.3 · made on Horizon fdc87ae
Added
- Easy place: look at a ghost block and its block is taken in hand; hold the right mouse button to place it, facing the right way. While it is on, only the schematic's blocks can be placed. Its own air place option places ghost blocks with no neighbour (/hm easyplace, Placement tab).
- Keys tab: bind any action to a key, including ones that had no key before: rotate, mirror, move to me, show or hide, select, unload, area corners and more.
Changed
- Pinned to Horizon Nightly 2026-11-08 (fdc87ae): two hook targets moved there (play_mouse to game/play_input.rs, pauses_game to game/pointer_capture.rs).
- Keys are bound on the Keys tab, no longer in Options > Mods. Keys you changed there are kept as the starting point.
- Credits moved from a tab to a button at the top left of the menu.
Fixed
- Area corners (/hm pos1, /hm pos2, the Save tab, the selection tool) are limited to positions a world can have; coordinates outside are refused with a message. The area's size and block count are computed with checked, wider arithmetic, so extreme corners can no longer overflow and give a wrong size to /hm save and its size limit.
- Moving, turning or mirroring a placement (/hm origin, /hm move, /hm rotate, /hm mirror, keys, wheel) is refused when it would reach outside the world, instead of overflowing.
- Schematic files whose regions lie extremely far out, or whose sizes multiply past 64 bits, are refused when read instead of overflowing.
- Layer shifting saturates instead of overflowing.
- At 720p the lower rows of the Placement tab ran under "Done"; that side now scrolls.
- A printer click on a server no longer counts as a click of the selection tool when the tool is in hand.
Built for Horizon Nightly 2026-11-08 (fdc87ae).
0.2.02026-11-04 · for Minecraft 26.3 · made on Horizon 67dad0d
Doesn't build on Horizon fdc87ae (E_TARGET_NOT_FOUND)
Added
- Highlights: mark missing and wrong blocks through everything, however far away, for all items or just one you pick in the material list (/hm highlight).
- Pick block: middle-click a ghost block to take that block in hand.
- Several placements at once: select, show, hide, lock and unload each.
- Select an area with the selection tool (a stick) and save it as a .litematic (/hm save).
- Copy the material list to the clipboard as a table for spreadsheets (/hm materials copy).
- Command completion for /hm in chat.
- A wiki in docs/wiki: every tab, button and key, with the matching command.
Changed
- Air place is off by default.
- Printer without air place: only blocks next to a real block whose face you can see are tried, blocks that can't be placed from where you stand aren't tried again until you move or a neighbour changes, and in each layer the item in hand comes first.
- Logs, froglights and other pillars get their direction from the clicked face alone. Without air place they need a real block on the matching side, and the printer's note says so.
- Pinned to Nightly 2026-11-04 67dad0d (was c9d474d).
Fixed
- The printer places bamboo, crops, stems, berry bushes and vines. They count as correct at any stage of growth, and the material list includes them.
Built for Horizon Nightly 2026-11-04 (67dad0d, hook API 359).
0.1.12026-11-02 · for Minecraft 26.3 · made on Horizon c9d474d
First release in the registry.
- Loads .litematic, .schem (Sponge v1–v3), .schematic (MCEdit, 1.12 ids) and structure .nbt; older files are upgraded with Horizon's data fixer
- Ghost overlay with real block models, see-through mode, verifier colours and layer modes
- Placements remembered per world and dimension; move mode, rotate, mirror
- Own menu screen (M) and a material list with item icons
- Printer: places missing blocks within reach, checked against the game's own placement logic; the camera never moves
Since 0.1.0 on GitHub: loading another schematic no longer shows the previous one's blocks.

Built for Horizon Nightly 2026-11-01 (c9d474d, hook API 80).

Download0.3.2 · 148 KB

From a terminal or an agent

horizon-launcher mods install --source horizon horizonmatica

In the launcher

Open Mods, pick Horizon beside Modrinth, find Horizonmatica and press Install. It checks the file's checksum and signature first.

By hand

Download horizonmatica-0.3.2.hnmod with the button above, check its SHA-256 against the one under File, and unzip it into a folder, then build the game with it: horizon-launcher native-build FOLDER --trust-native-code. It plays in the Native mods instance.

File

Name: horizonmatica-0.3.2.hnmod
Size: 148 KB
SHA-256: c73b7909541fdc8f2c1127323cb8df30f5e186e46f7c5a672fe5c9b8b8dbdfe1
Signing key: RWS+BRoCJslNCFapck3cbG2VFQcjlr1MUH5m3+CWA8zhJecoBoja7X94

Publisher

Published by: @keksi2k
Signature: Signed: every file is signed with the author's key

Rating

Checking…

Features

Formats: .litematic (versions 1–7, several regions), .schem (Sponge v1–v3: WorldEdit, FAWE, Amulet, Axiom), .schematic (MCEdit / WorldEdit up to 1.12) and vanilla structure .nbt. Older files are upgraded with Horizon's data fixer, the same way old worlds are.

Overlay: missing blocks as translucent real block models (chests, banners, heads and other block entities included), optionally visible through walls.

Verifier: wrong block (red), wrong state (orange), extra block (pink), plus a progress HUD.

Layers: all / one layer / above / below / range.

Placements: several at once; move, rotate, mirror, show or hide each; a move mode for mouse wheel and arrow keys. The placements are remembered per world and dimension and restored when you join again.

Save your own: select an area with the selection tool (a stick: left and right click set the corners, the wheel grows and moves the box) and save it as a .litematic (blocks and their states), chunk by chunk as in Litematica: chunks not loaded yet show as frames to fly to.

Material list: missing, total and carried, with item icons, in the HUD or in the menu, and copied to the clipboard as a table for spreadsheets.

Menu (M): a screen of its own, drawn with the game's widgets.

Pick block: middle-click a ghost block to take that block in hand, for building by hand.

Highlights: mark missing and wrong blocks through everything, however far away, for all items or just one you pick in the material list.

Printer: places one missing block within reach every few ticks, from the bottom up. It only clicks when Horizon's own placement logic says the click produces exactly the wanted state (stairs, slabs, logs, furnaces…). Redstone-aware order, repeater, comparator and note block setup after placing, double slabs and stacks, chests, falling blocks. The camera never moves.

Usage: put schematics into schematics/ next to options.txt of your instance (/hm folder shows the path), then /hm load <name> or press M. All commands and keys are in the README.

What it does and doesn't do

Reads only files in the instance's schematics/ folder, and creates that folder if it's missing.

Writes only the .litematic files you save (/hm save), into that folder. Settings and remembered placements go through Horizon's mod settings.

Network: no connections of its own. The only thing sent to a server is what the printer does: the same block-placing clicks a player would make (with the matching look direction), and hotbar slot changes.

"Open folder" in the menu opens the schematics folder in your file manager through Horizon's own function.

No telemetry, no downloads, no code run from schematic files. Schematics are parsed as data only.

Version: native mods use game internals, so Horizonmatica is pinned to one Horizon commit (currently Nightly 2026-11-04, 67dad0d). A new Nightly needs a new release.

Credits

Menus built with horizon-menus. MIT licensed.

Native code

Versions

0.3.22026-11-08 · for Minecraft 26.3 · made on Horizon fdc87ae
Added
- Easy place: look at a ghost block and its block is taken in hand; hold the right mouse button to place it, facing the right way. While it is on, only the schematic's blocks can be placed. Its own air place option places ghost blocks with no neighbour (/hm easyplace, Placement tab).
- Keys tab: bind any action to a key, including ones that had no key before: rotate, mirror, move to me, show or hide, select, unload, area corners and more.
Changed
- Pinned to Horizon Nightly 2026-11-08 (fdc87ae): two hook targets moved there (play_mouse to game/play_input.rs, pauses_game to game/pointer_capture.rs).
- Keys are bound on the Keys tab, no longer in Options > Mods. Keys you changed there are kept as the starting point.
- Credits moved from a tab to a button at the top left of the menu.
Fixed
- Area corners (/hm pos1, /hm pos2, the Save tab, the selection tool) are limited to positions a world can have; coordinates outside are refused with a message. The area's size and block count are computed with checked, wider arithmetic, so extreme corners can no longer overflow and give a wrong size to /hm save and its size limit.
- Moving, turning or mirroring a placement (/hm origin, /hm move, /hm rotate, /hm mirror, keys, wheel) is refused when it would reach outside the world, instead of overflowing.
- Schematic files whose regions lie extremely far out, or whose sizes multiply past 64 bits, are refused when read instead of overflowing.
- Layer shifting saturates instead of overflowing.
- At 720p the lower rows of the Placement tab ran under "Done"; that side now scrolls.
- A printer click on a server no longer counts as a click of the selection tool when the tool is in hand.
Built for Horizon Nightly 2026-11-08 (fdc87ae).
0.2.02026-11-04 · for Minecraft 26.3 · made on Horizon 67dad0d
Doesn't build on Horizon fdc87ae (E_TARGET_NOT_FOUND)
Added
- Highlights: mark missing and wrong blocks through everything, however far away, for all items or just one you pick in the material list (/hm highlight).
- Pick block: middle-click a ghost block to take that block in hand.
- Several placements at once: select, show, hide, lock and unload each.
- Select an area with the selection tool (a stick) and save it as a .litematic (/hm save).
- Copy the material list to the clipboard as a table for spreadsheets (/hm materials copy).
- Command completion for /hm in chat.
- A wiki in docs/wiki: every tab, button and key, with the matching command.
Changed
- Air place is off by default.
- Printer without air place: only blocks next to a real block whose face you can see are tried, blocks that can't be placed from where you stand aren't tried again until you move or a neighbour changes, and in each layer the item in hand comes first.
- Logs, froglights and other pillars get their direction from the clicked face alone. Without air place they need a real block on the matching side, and the printer's note says so.
- Pinned to Nightly 2026-11-04 67dad0d (was c9d474d).
Fixed
- The printer places bamboo, crops, stems, berry bushes and vines. They count as correct at any stage of growth, and the material list includes them.
Built for Horizon Nightly 2026-11-04 (67dad0d, hook API 359).
0.1.12026-11-02 · for Minecraft 26.3 · made on Horizon c9d474d
First release in the registry.
- Loads .litematic, .schem (Sponge v1–v3), .schematic (MCEdit, 1.12 ids) and structure .nbt; older files are upgraded with Horizon's data fixer
- Ghost overlay with real block models, see-through mode, verifier colours and layer modes
- Placements remembered per world and dimension; move mode, rotate, mirror
- Own menu screen (M) and a material list with item icons
- Printer: places missing blocks within reach, checked against the game's own placement logic; the camera never moves
Since 0.1.0 on GitHub: loading another schematic no longer shows the previous one's blocks.

Built for Horizon Nightly 2026-11-01 (c9d474d, hook API 80).