Blind Mute Deaf

A party game mode where every player loses one sense — and has to get the job done anyway.

Fabric 26.2 (Java 25). Requires Fabric API. Simple Voice Chat is optional, but without it Mute and Deaf lose half their point.

The mod has to be installed on the server and on every client — blindness, the sound cut-off and the gesture wheel all live on the client side. With requireClientMod (on by default) players without it are kicked at login instead of silently playing an easier game.

What it looks like

The gesture wheel — hold Left Ctrl, aim with the mouse, release.	Through the blind player's eyes — a sound fires a wave that lights up the shape of the surroundings.
Calling for help — the mute player cannot say this out loud or in chat.	Gestures sit on the nametag — visible from any distance.

The classes

Class	What it takes away	What it gives back
👁 Blind	Screen completely black	3D echolocation: every sound fires a wave that lights up the shape of the room
🔇 Mute	Microphone cut off server-side, no chat, no damage	Gesture wheel + a sign showing any item
🔈 Deaf	No sound at all (game and voice), no right-click	Speaks normally, sees every gesture

Blindness is not the Blindness effect — it is a black rectangle on the very top of the HUD. Blindness can be brightened with the gamma slider and still lets you see blocks right in front of your face; there is no working around this one.

Voice is handled server-side through the Simple Voice Chat API: the mute player's microphone packet is cancelled, the deaf player is never sent audio packets. Nothing in a player's own SVC config changes that.

Commands

/bmd                          describe your own class (anyone)
/bmd random [players]         deal the three classes out evenly
/bmd set <players> <class>    blind | mute | deaf | none
/bmd mode <easy|normal|hard>  how blind the blind player is (saved to the config)
/bmd list                     who has what
/bmd reset                    clear everything

/bmd goal which challenge is running, and for how long (anyone) /bmd goal random roll a goal: easy | normal | hard /bmd goal set a specific goal /bmd goal list the 20 goals of that difficulty /bmd goal clear drop the challenge

Everything except `/bmd`, `/bmd info`, `/bmd goal` and `/bmd goal list` requires gamemaster
permission (the old level 2). Completing a goal lifts every restriction at once.

## Keys

| Key | Action |
|-----|--------|
| **Left Ctrl** (hold) | gesture wheel — aim with the mouse, release the key |
| **Left Alt** | item sign (mute player only) |

Gestures: Yes ✔, No ✕, Help ❤, Danger ⚠, Follow me ➜, Wait ⌛, No idea ?, Ha ha ☺.
Each has its own sound — the blind player hears that someone is signalling, but not what.

## Configuration

`bmd_config.json` in the world folder, created on first start.
Debuffs enabled by default: `muteCannotAttack`, `muteCannotChat`, `deafCannotUseItems`.

Keys that work:

| Key | Default | Effect |
|-----|---------|--------|
| `muteCannotAttack` | `true` | the mute player deals no damage to anything (arrows included) |
| `muteCannotChat` | `true` | no chat for the mute player, and no `/msg`, `/me`, `/say` |
| `muteItemSign` | `true` | the mute player can hold any item up above their head |
| `deafCannotUseItems` | `true` | no right-click for the deaf player (eating still works) |
| `onlyBlindCanCraft` | `true` | only the blind player may craft |
| `requireClientMod` | `true` | kicks players without the mod on their client |
| `blindMode` | `"NORMAL"` | `EASY` \| `NORMAL` \| `HARD` — same as `/bmd mode` |
| `blindEchoRange` | `24.0` | echolocation range in blocks |
| `blindShowHud` | `true` | the black goes under the HUD (hotbar and bars stay visible) |
| `blindEasyDarkness` | `0.6` | extra screen dimming in `EASY` mode (0.0–1.0) |

Keys that are written to the config but **do nothing yet** — setting them to `true` only adds
a line to the class description: `muteCannotOpenContainers`, `muteHalfDamage`,
`deafHidesNameTags`, `deafMinesSlower`, `deafAggroRangeDoubled`, `blindSlowness`.

## Building

```bash
./gradlew build          # → build/libs/bmd-<version>.jar
./gradlew runServer      # development server
java src/main/java/dev/kajor/bmd/Geometry.java   # math self-check

Requires JDK 25 (MC 26.2). The path to it lives in gradle.properties as org.gradle.java.home.

License

MIT — see LICENSE.