DayNightCycle

Day/Night Cycle

Adds a continuous day and night cycle to How to Fish. The sun moves across the sky, and

fog, ambient light and sun color follow the time of day — dawn, day, dusk, night, and back

around.

The clock is derived from the FishNet server tick, so everyone in a co-op lobby sees the

same time without a single extra network message.

Install

With a mod manager (r2modman Mod Manager): click Install. Nothing else to do.

Manually:

• Install BepInEx 5.4.23+ (win x64 Mono build) into the game folder, next to How to Fish.exe.
• Launch the game once and close it, to generate BepInEx/plugins and BepInEx/config.
• Copy the BepInEx folder from this zip over the one in the game folder.
• Launch the game.

Features

• Continuous cycle. Sun rotation, fog color and density, ambient intensity and reflection

intensity all interpolate through dawn, day, dusk and night.

• Synced in co-op. Time comes from the FishNet server tick, so it cannot drift between

players, and someone joining mid-session lands on the correct time on their first frame.

• Zero network cost. No broadcasts, no serializers, no handshake.
• A night that actually looks like night. The game's skybox ships with an unauthored

night gradient (a burnt-orange horizon that reads as a permanent sunset). The mod replaces

those two colors, and keeps the real sunrise/sunset band where it belongs.

• Configurable. Cycle length, starting time, night sun intensity, moonlight color, night

fog color and density.

• Underwater fog untouched. Diving still looks the way the game intended.
• Works offline. Falls back to a local clock in single player or when no server is running.
• Open to other mods. Exposes a public DayNightAPI with TimeOfDay, DaylightFactor

and NightFell / DayBroke events.

Config

Written to BepInEx/config/com.zpaulin.howtofish.daynight.cfg on the first run.

| Key | Default | What it does |

|---|---|---|

| Enabled | true | Off returns the game to its original lighting |

| DayLengthSeconds | 1200 | Length of one full cycle, in real seconds |

| StartTimeOfDay | 0.30 | 0 = midnight, 0.25 = dawn, 0.5 = noon, 0.75 = dusk |

| SyncToNetworkTick | true | Derive the clock from the FishNet server tick |

| FreezeTime | false | Hold the clock at the current time |

| SunYawSweep | 60 | Degrees of azimuth the sun sweeps, which rotates shadows |

| NightSunIntensity | 0.08 | Moonlight strength, as a fraction of the daytime value |

| MoonlightColorHex | #5C7BB8 | Directional light color at night |

| DriveSky | true | Retune the skybox night colors |

| SkyNightTopColorHex | #070C1A | Zenith the skybox blends toward at night |

| SkyNightBottomColorHex | #111A2E | Horizon the skybox blends toward at night |

| SunsetBandStrength | 1 | How much of the authored sunrise/sunset band to keep |

| MoonBrightness | 1 | Multiplier on the skybox moon |

| DriveFog | true | Let the mod drive fog color and density |

| NightFogColorHex | #0B1220 | Fog color at deepest night |

| NightFogDensityMultiplier | 1.8 | Night fog density relative to the game default |

| NightAmbientIntensity | 0.15 | Ambient intensity at deepest night |

| NightReflectionIntensity | 0.2 | Reflection intensity at deepest night |

Commands

Typed into the game's own debug console. Output goes to the BepInEx console.

/dn status

/dn on | off

/dn day | night | dawn | dusk

/dn time 0.75 or /dn time 18:30

/dn length 600

/dn freeze

/dn resync

Time commands shift only your own client, on purpose, for testing. Use /dn resync to

return to the lobby clock.

Co-op notes

Every player needs the mod, with matching DayLengthSeconds and StartTimeOfDay. The

defaults match, so this only matters if you edit the config — mismatched values mean players

see different skies.

For mod authors

[BepInPlugin("com.example.mymod", "My Mod", "1.0.0")]

[BepInDependency("com.zpaulin.howtofish.daynight")]

public class MyPlugin: BaseUnityPlugin

{

private void Awake()

{

DayNightAPI.NightFell += day => SpawnWave(day);

DayNightAPI.DayBr