RotRadarMinimap
Toggleable R.E.P.O.-style live minimap for Grain Rot. Press M in a dungeon. Auto-rotates to your spawn facing and shows teammates in their spark colors.Rot Radar Minimap
A toggleable, R.E.P.O.-style minimap for Grain Rot.
Grain Rot only shows you the dungeon layout on the physical map-room table and on the end-of-run "Your Journey" screen. Rot Radar puts a live minimap in the corner of your screen: the dungeon layout, your position and facing, your teammates in their spark colors, and the spawn elevator.
Controls
| Input | Action |
|---|---|
| M | Toggle the minimap |
| Numpad + / - | Resize |
| Home / End / Delete / Insert | Nudge marker calibration (quarter-tile steps) |
| F9 | Debug info to the UE4SS console/log |
| F8 | Full map dump (ASCII) to the UE4SS console/log |
What you see
- White shapes — rooms and corridors, built from the dungeon generator's own room data (exact per-tile footprints), outlined for readability
- Dim boxes — special/prefab rooms that only report a rough bounding box
- Green square — the spawn elevator
- Orange marker — you (rotates with your facing; follows your Spark if your vessel dies)
- Colored dots — your teammates, live, each in their chosen spark color
The whole map auto-rotates so the direction you face when you first step out of the spawn elevator is up — every dungeon, every run, regardless of how the generator spins the layout. The map has no backing panel and translucent fills, so it stays readable without blocking your view of the game.
Installation
Install with the Thunderstore Mod Manager or r2modmanPlus — the
required UE4SS setup (GrainRot UE4SS + unreal shimloader) installs
automatically as dependencies. Press M in a dungeon.
Multiplayer
- Friends do not need the mod to play with you — nothing in the game files is modified, so modded and unmodded players join each other freely.
- The map works whether you host or join: every machine generates the same dungeon from the shared seed, and Rot Radar reads your local copy.
- Teammate markers work even if the teammates don't have the mod — their positions and spark colors replicate natively; only you need the mod to see them.
How it works (for the curious)
Rot Radar does not screenshot or unpack any game asset. It reads the dungeon generator's replicated room grid (room and corridor tile footprints), rebuilds the layout as a UMG overlay at runtime, and converts world positions into the same tile grid — compensating for the per-run rotation the generator applies to the whole dungeon.
Troubleshooting
- "no dungeon map available here" — you're in the outpost or between runs; the map only exists during an active dungeon run.
- Marker slightly off-center from the corridors — tap Home/End/Delete/Insert to nudge it (quarter-tile per tap); the offset shows in the UE4SS log.
- Static transition hallways (some stair sections) don't appear — those exist in no dungeon data; the map draws everything the generator knows.
Credits
- Runs on the GrainRot UE4SS community overlay and RE-UE4SS.
- Minimap concept inspired by R.E.P.O.
Changelog
1.0.3
- Documentation and metadata update. No gameplay changes.
1.0.0
- Initial release: live self-rendered minimap with per-tile room footprints, auto-rotation to spawn facing, teammate markers in spark colors, Spark follow-through on vessel death, resize and calibration hotkeys.