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Structure Gel API
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Structure Gel API

Java mod listed for Minecraft 1.16–1.21. File opened and checked on 22 Sep 2026; downloads from the MC Java Mods app on Android.

by ModdingLegacy · on CurseForge

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Minecraft version

⬇ Download for 1.21.4 · NeoForge⬇ Download for 1.20.4 · NeoForge⬇ Download for 1.20.1 · NeoForge⬇ Download for 1.20.1 · Forge⬇ Download for 1.19.4 · Forge⬇ Download for 1.19.3 · Forge⬇ Download for 1.19.2 · Forge⬇ Download for 1.19.1 · Forge⬇ Download for 1.19 · Forge⬇ Download for 1.18.2 · Forge⬇ Download for 1.18.1 · Forge⬇ Download for 1.17.1 · Forge⬇ Download for 1.16.5 · Forge
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
Structure Gel API — screenshot 1Structure Gel API — screenshot 2

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Modding Legacy Discord Server Contribute to Structure Gel API by helping break the language barrier by translating on Weblate! If you like what we do, please consider supporting us on Ko-fi! Thank you! Built with NeoForge

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An API for simplifying the developer end of creating generated structures.


Structure Gel is an API mod designed to make creating structures easier on the developers, specifically ones using the jigsaw system. All code is open source and documented. Some of its features include:

📚 Read the Structure Gel API Documentation Here

For an open source working example of this api, check out Dungeons Plus

You can find detailed information on how to develop and use this API by Minecraft version.

Latest Documentation

🧪 Latest Features

🛠️ Building Tools

The Building Tool is a new creative mode only item used to perform various large scale block alterations.

GUI

The GUI contains various buttons to modify the Building Tool's settings, as well as some convienent tools.

Controls

Modes

Building Tool Modes are different operations that the Building Tool can perform.

Building Tool Shape

Mode Properties

Some modes support additional settings to modify their behavior. Some examples include:

🍡 Structure Gel Block

This block is a creative tool to fill the insides of structures easily. The gel is replaced with air when your structure generates while all air is ignored when being placed. This ensures that your structures won't have natural terrain where it shouldn't be. The gel block behaves similarly to structure voids in that you can walk through it, while actually being visible.

When placing gel while sneaking, you can trigger the spreading mechanic. Each gel spreads differently, and you can read how they work by hovering over the item.

🍮 Meet the Gels!

🟥 Red Gel

Red gel uses the default spreading mechanic, spreading along the cardinal directions, only replacing air.

Red Gel

🟦 Blue Gel

Blue gel functions similarly to red, except it won't spread into locations where the sky can be seen.

Blue Gel

🟩 Green Gel

Green gel spreads the same as red gel, with the addition of also spreading diagonally. This allows it to get through corners created by vines or other complex builds. Be careful not to let it leak outside of your build.

Green Gel

🟦 Cyan Gel

Cyan gel acts as a combination of green and blue gel, by both spreading diagonally and avoiding the sky.

Cyan Gel

🟧 Orange Gel

Orange gel behaves the same as red gel, but the distance it spreads is determined by how many you're holding when you place it, making it handy for builds in open areas.

Orange Gel

🟨 Yellow Gel

Yellow gel will only spread along the plane that you're facing when you place it, making it great for sealing off walls, windows, or other holes that the gel would otherwise go through.

Yellow Gel


Removing Gels

Gel can be removed by using gunpowder on it. Doing this will trigger a chain reaction, removing all connected gels of the same type.

Removing Gel


Examples

Here's an example of how it could be used in a build. If this structure were loaded into the game, the gel inside would be replaced with air, while the air outside would not be placed.

House Example

The code for this block is designed in a way such that you can easily extend it and hook into its behavior with methods in blocks.IStructureGel, should you need behavior not already implemented.

This is a core mod that modifies a few internal classes. If you get a crash with this mod that only occurs when mixed with another mod, this may be the cause. Please test before reporting.


🌐 Translate Structure Gel API - Help break the language barrier!

All translators are credited here. Thanks to OneSkyApp, you can translate easily!

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Flag for Deutsch Deutsch translations by: A1403, Barion
Flag for Português (Brasil) Português (Brasil) translations by: gabisaoo, simsgameboh
Flag for Nederlands (Nederland) Nederlands (Nederland) translations by: faas.mr
Flag for Español (España) Español (España) translations by: Minaderm , guillermojuegostablet, juggernogk
Flag for Українська (Ukrayins'ka) Українська (Ukrayins'ka) translations by: Queez
Flag for Türkçe (Türkiye) Türkçe (Türkiye) translations by: asimemir58, demirgokler406
Flag for עברית ('Ivriyþ) עברית ('Ivriyþ) translations by: pecan1245
Flag for Español (Argentina) Español (Argentina) translations by: patriciofagetti
Flag for Italiano (Italia) Italiano (Italia) translations by: antonioauciello226
Flag for Lietuvių Lietuvių translations by: WaryRGMCA


🤚 Support: If you have questions or any issues with our mods, read the FAQ! You can also either submit an issue on the issue tracker, or come into our Discord server where we can help you!

Modding Legacy Discord Server

Quick facts

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

File checked by MCModsHub

These come from our own check of the pack file, not from the source page.

📺 Java videos for Structure Gel API watch on YouTube ↗

Minecraft 1.19.2 Forge Modding Tutorial | STRUCTURES IN VILLAGE | #38YouTubeMinecraft 1.19.2 Forge Modding Tutorial | STRUCTURES IN VILLAGE | #38Modding by KaupenjoeCreate your own STRUCTURES in MinecraftYouTubeCreate your own STRUCTURES in MinecraftColebot
🎬Made a video about Structure Gel API? Feature it #1 here for free — put the mcmodshub.com link near the top of your description, or in a pinned comment.→

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