The Witcher 3: Wild Hunt Dynamic Fog Mod v2.1

                    
Picture Geralt wading through a swamp at dawn, fog curling around his boots until Igni boils it away. Dynamic Fog builds that scene with a new fog system for The Witcher 3. It runs as a ReShade add-on and relies on the Witcher Native Bridge API, a script-to-native bridge. The mist now thickens at dawn and answers every Sign you cast.
What You Get

Dynamic Fog: Holds the whole mod in one 540KB archive, with folders that merge into your game folder.

Fog Behavior

Ground Fog: Settles dense, low banks on ground and water, so swamps and valleys fill up while the wind pushes them along.
Fog Interaction: Lets Geralt, characters, and monsters stir the fog as they move, and every Sign pushes it.
Time of Day: Keeps fog low and translucent by day, then raises and thickens it from dusk through dawn.
Weather: Gives every weather its own fog thickness, so rain storms bring the heaviest fog, day or night.
Towns and Interiors: Keeps fog about waist high inside settlements, though it fades out in houses and caves.
Lit by the Game: Uses the game’s own sun, fog colors, and lighting, so the original mood stays intact.

Sign Effects

Aard and Igni: Aard bursts out as a cold white-blue wall of fog, while Igni boils the fog into orange steam.
Yrden and Magic Trap: Yrden draws violet fog to the circle edge, while Magic Trap pours it down the tower.
Quen and Active Shield: Quen swirls golden fog around Geralt’s chest, and Active Shield wraps golden fog around its bubble.

Paramètres

Fog Settings: Adjusts density, transparency, distance, height, brightness, and interaction strength live, so changes apply without a restart.
Fog Quality: Ranges from 2 to 16 with a default of 10, so lower is faster and higher is smoother.

The Payoff
Fog changes how a swamp feels, and this mod makes it respond to everything around Geralt. The look stays yours to shape, so you can chase a thick swamp haze or a light morning veil. In return, smoother fog costs speed, so leave your GPU some headroom.
Setup Guide

Téléchargez le mod et décompressez l'archive sur votre PC.
Installer ReShade with add-on support, and pick bin\x64_dx12\witcher3.exe plus DirectX 10/11/12 when the installer asks. Skip both the effects list and the add-ons list.
Install the Witcher Native Bridge API next, since the mod needs it.
Copy the contents of the extracted folder into your The Witcher 3 game folder, then let the folders merge.
Launch the game, open Settings > Graphics, and set Screen Space Reflections à High. On Low the game skips the step that draws the fog, so no fog appears.
Ouvrir Settings > Mods > Dynamic Fog to tune the look, and press Default to restore the recommended values.
To uninstall, delete bin\x64_dx12\WitcherDynamicFog.addon64 et bin\x64_dx12\DynamicFog.asi. Then delete bin\config\r4game\user_config_matrix\pc\modDynamicFog.xml et le Mods\modDynamicFog dossier.
If no other mod uses them, also delete WitcherNativeBridge.asi et dinput8.dll de bin\x64_dx12, plus the Mods\modNativeBridge dossier.

Small Print

This mod includes AI-generated media.
The mod needs The Witcher 3 Remastered with patch 5.0 or newer, and it runs on DirectX 12.
Dynamic Grass runs alongside this mod, so if you already use it, you have both requirements.
Open the ReShade overlay in game to see the mod’s status.