Polydex2REI-Forked: Full Recipe Viewer Support for Polymer Items
If you run a modpack or develop add-ons with Polymer, you already know the frustration: your custom virtual items exist on the server, but REI (Roughly Enough Items) simply refuses to show them. Recipe pages come up empty, item lookups fail, and players are left confused. Polydex2REI-Forked is the compatibility add-on that closes that gap, letting Polymer's server-side virtual items and Polydex-defined recipes appear correctly inside REI.
What Polydex2REI-Forked Actually Does
Polymer lets servers register virtual items that never exist as real client-side entries. REI, by contrast, builds its entire interface from what the client can see. The result is a mismatch: recipes registered through the Polydex API stay invisible, and clicking an item does nothing. Polydex2REI-Forked acts as the bridge between these two systems, translating Polymer's virtual data into a format REI understands.
This forked build keeps the original add-on's purpose intact while offering an alternative distribution for players who prefer a maintained fork. It is designed for Fabric-based setups, and the current builds target Minecraft 1.20.1 through 1.21.x, with the loader requirements matching whatever Polymer, REI, and Polydex versions you already run.
Key Features at a Glance
- Displays custom recipes registered through the Polydex API directly in REI.
- Synchronizes item lookup actions, so clicking or pressing the recipe key opens the correct page.
- Handles both server-side and client-side virtual items.
- Works as a plug-and-play add-on with no extra configuration files.
- Requires installation on both client and server to function properly.
Why the Fork Exists
Forks appear when a project needs continued attention, updated mappings, or a fresh release cadence. Polydex2REI-Forked serves exactly that role: it preserves the original bridging behavior while giving modpack authors a version they can drop into modern Fabric packs. If you have been searching for a way to make Polymer guide items, UI buttons, or recipe placeholders show up in REI, this fork delivers that without asking you to rewrite anything.
Requirements Before You Install
Three mods must be present: Polymer, REI, and Polydex. All of them, plus Polydex2REI-Forked itself, need to be installed on both the client and the server. A client-only install will not work, and neither will a server-only one. Match your Minecraft version across every mod to avoid silent failures where REI loads but shows nothing new.
For players who would rather skip manual file juggling, the foxygame.net launcher offers a one-click install path for Polydex2REI-Forked, pulling the correct build for your selected Minecraft version automatically. It is a convenient option when you are assembling a pack and do not want to chase matching jars by hand.
How to Install Polydex2REI-Forked
Manual Installation
- Confirm your Minecraft version and Fabric loader build.
- Place Polymer, REI, Polydex, and Polydex2REI-Forked into your mods folder.
- Repeat the same setup on the server's mods folder.
- Restart the client and server, then open REI and search for a Polymer virtual item.
Using a Launcher
If you download Polydex2REI-Forked through a managed launcher, the add-on catalog handles dependency checks and version compatibility for you. Updates arrive automatically, so a Polymer or REI bump will not leave you hunting for a matching fork release.
Who Should Use This Add-On
Modpack creators registering virtual items through Polydex are the primary audience. The same applies to developers building guide books, menu buttons, or placeholder entries that need to appear in a recipe viewer. Server owners running Polymer-based content will also benefit, since players can finally browse recipes the way they expect.
If you are not using Polymer or Polydex, this add-on will do nothing for you. It is a targeted compatibility layer, not a general REI extension.
Final Thoughts
Polydex2REI-Forked solves a narrow but genuinely annoying problem: invisible recipes. By connecting Polymer's virtual item system with REI's interface, it makes custom content discoverable and clickable again. Install it on both sides, keep your versions aligned, and your recipe viewer will finally reflect everything your server offers.