Netheroreoverlay
by Willld
On Fabric for Minecraft 1.21.11, Netheroreoverlay is a client-side mod that estimates where ores sit in the Nether from the world seed and paints them as colored markers in the world.
What it does
Using the world seed, the mod estimates where ores are likely to be near the player and draws colored in-world overlays on them. It only works in the Nether, and it is built on the same approach as the OreOverlay mod, which the author credits as the basis of this one.
Because the overlay is computed on the client, only the player's own game needs the mod, and servers do not have to install anything. The author states that the code includes server-side parts for interacting with Minecraft servers, and that players should follow the rules of the community where they play. The mod was intended for single-player testing, seed analysis and technical experimentation.
The project is released under the MIT License and is open source. Files exist for Fabric only, and the single version is 1.21.11, with 1.0.0 as the latest file, published on 2026-06-04.
Key features
Nether ore prediction
Estimates the positions of nearby ores in the Nether from the world seed, so the overlay can show likely spots before they are mined into view.
Colored in-world overlays
Draws each predicted ore location as a colored marker in the world, so the spots stand out against the terrain around them.
Single-player seed analysis
Built for single-player testing and seed analysis, where a player can compare predicted ore placement across worlds.
Nether-only operation
The overlay is active only in the Nether dimension and does nothing in the Overworld or the End.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Seed analysis
Players and researchers can use the predicted ore positions to study how ore generation behaves for a given seed.
Technical experiments
Developers testing ore generation or client rendering can use the mod as a reference for how predicted overlays are drawn.
Who it’s for: The mod suits players who want to explore ore placement in single-player Nether worlds, and developers interested in seed analysis and client-side rendering on Fabric for 1.21.11.
Questions
Does Netheroreoverlay need Fabric API?
Do servers need to install Netheroreoverlay?
Does the overlay work outside the Nether?
In the catalog
Netheroreoverlay is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
NetherOreOverlay is a client-side Fabric mod for Minecraft 1.21.11 that helps you find ores by predicting nearby ore locations from a world seed and drawing them as colored in-world overlays. This only works in the nether. Huge thanks to the creator (armi1014) of OreOverLay, without them this mod wouldn't exist.
Official listing
- Modrinth page
- modrinth.com/mod/netheroreoverlay
- Owner
- Willld
- Published
- 2026-06-04
- Updated on Modrinth
- 2026-06-04
- Facts verified
- 2026-10-15