Haven't I Seen This Before?

👀 Haven't I Seen This Before? (HISTB?)

Find every copy of your saved builds in the world around you — automatically.

Load one of your Litematica schematics and HISTB? outlines every place that build already exists in the area loaded around you — including rotated and mirrored copies. A lightweight, client-side companion for MaLiLib / Litematica.

Minecraft 26.1.2 · Fabric · client-side only · a visual overlay that never changes the world

⚡ TL;DR (30 seconds)

1. Install HISTB?, Fabric API, and MaLiLib (drop the .jars in your mods folder).
2. In Litematica, save the build you want to find as a .litematic.
3. In game: open Mod Menu → HISTB? → Schematics tab → click your file.
4. Go to the General tab → turn it ON.
5. Walk around. Your matching builds light up. ✨

That's it. No setup, no commands, no fiddling.

🎯 What it does

You point it at one of your builds (a schematic). It looks through the chunks already loaded around you and draws an outline on every copy of that build it finds — even if the copy is rotated or mirrored.

Great for:

• Locating your own builds across a big base — villager halls, iron farms, shops
• Counting how many copies of a modular build you've placed
• Keeping a large creative or survival project organized
• Re-finding a build you made ages ago and can't remember where you put it

HISTB? only ever reads the world already loaded around you — the same client-side data Litematica and MiniHUD use. It is a visual overlay: it never reads server-side data, never edits a single block, and changes nothing for anyone else.

📦 Install (step by step)

You need 3 mods. Put all of them in your .minecraft/mods folder (or your modpack's mods folder):

👉 Most people also want Litematica — that's what you use to make the schematics HISTB? looks for.

Make sure every mod matches Minecraft 26.1.2.

🕹️ How to use it

Step 1 — Make a schematic (in Litematica)

Select an area around a build → save it. You now have a .litematic file in your schematics folder. (Already have .litematic or .nbt files? Skip this step.)

Step 2 — Load it into HISTB?

Open Mod Menu → HISTB?. You'll see tabs across the top:

• Schematics → click a file to load it (it turns into a "pattern").
• Patterns → see your loaded patterns, tick/untick which ones to look for.
• General → the ON / OFF switch.

Step 3 — Turn it on

General tab → Enable. Done. It scans automatically and outlines matches live as you move.

Prefer a hotkey? Options → Controls → Haven't I Seen This Before? — bind Toggle and Open menu to whatever keys you like. (They're unbound by default so they never clash with your other mods.)

⚙️ Settings (all optional)

Everything lives in the Mod Menu tabs — no config files to edit.

• Matching — how strict a match must be, and whether to include rotated / mirrored copies.
• Display — box style (outline / filled / both), colour, line width, whether outlines draw through terrain (you can turn that off), and optional chat coordinates.

❓ Quick troubleshooting

🌐 Multiplayer

HISTB? is a personal, client-side overlay built on the same rendering Litematica uses. It only outlines copies of the schematics you load, using chunks already loaded on your client — it sends nothing to the server and changes nothing for other players. As always, follow the rules of any server you play on.

🧠 How it works (for the curious)

It reads the blocks in your loaded area and looks for spots where they match your schematic's exact layout. To stay fast it skips chunk sections that can't possibly contain your build (the same trick Litematica uses), and it scans on a background thread so your game never stutters.

Heads up: HISTB? discovers builds by reading the world around you, so it can only outline things in loaded chunks (your render distance). Unlike Litematica's placed holograms, it can't show a match in a chunk that isn't loaded yet — there's simply no data there to read.

🙏 Credits

Made by Limucc-dev. Powered by MaLiLib (by masa). Schematics compatible with Litematica.

MIT licensed — do what you like with it.