add fog

core/environment_config.gd

@@ -83,6 +83,7 @@ extends Resource
 @export var enable_dust: bool = false #Floating dust particles overlay
 @export var enable_blur: bool = true #Screen blur effect
 @export var enable_environment_shadows: bool = true #Cloud shadow projection on terrain
+@export var enable_fog: bool = true #Enable fog around the train
 @export var blur_amount: float = 0.6
 
 @export_group("Dust")