A free mod for Witcher 3, by jadugarr.
In this application, we've created a way for you to manually toggle the night vision effect from the Cat potion/metamorphoses mutagen.
You can now manually toggle the night vision effect with a keybind, which will allow you to save the state of the mod, so you don't have to remember to toggle it each time you start your game.
Installation:
1) put the mod file in your mod directory
2) edit the input.settings file in your my documents folder and add the "ToggleCat" keybind.
3) restart your game
Variant 1 of this mod requires the Cat potion to be consumed/mutagen to be active for you to be able to toggle, while Variant 2 does not.