Fog

Describes atmospheric fog applied to a scene.

Fog is a scene-level effect that blends fragment color toward a fog color based on distance from the camera. It can be used to suggest large scale, hide distant detail, and soften transitions into the background.

// Adds linear fog to scene
my_scene->fog = Fog::CreateLinear({
  .color = 0x444444u,
  .near = 2.0f,
  .far = 6.0f
});

// Adds exponential fog to scene
my_scene->fog = Fog::CreateExponential({
  .color = 0x444444u,
  .density = 0.3f
});

Construction

Constructors

Fog()

Constructs a fog object.

Fog::Fog(Type type, const Color& color);

Parameter	Description
type	Fog::Type specifying the attenuation model.
color	Fog color used for fully fogged fragments.

Factories preferred

Fog::CreateExponential() Fog

Creates an exponential fog object.

Exponential fog increases with distance using a density parameter, typically with a factor like or a related variant, which produces a smooth atmospheric falloff.

static Fog Fog::CreateExponential(const ExponentialParameters& params);

Parameter	Description
params	Initialization parameters.

Fog::CreateLinear() Fog

Creates a linear fog object.

Linear fog increases its effect given a distance range along the view direction, typically using a factor similar to .

static Fog Fog::CreateLinear(const LinearParameters& params);

Parameter	Description
params	Initialization parameters.

Types

Fog::Type enum

Fog attenuation models.

Selects how fog intensity increases with distance. Linear fog uses a depth range, while exponential fog uses a density-based curve that grows smoothly with distance.

Value	Description
Linear	Depth-based fog using a near and far distance range.
Exponential	Density-based fog using a continuous falloff curve.

Fog::ExponentialParameters struct

Parameters for constructing an exponential Fog object.

Parameter	Description
color Color	Fog color.
density float	Exponential density factor (higher values produce thicker fog).

Fog::LinearParameters struct

Parameters for constructing a linear Fog object.

Parameter	Description
color Color	Fog color.
near float	Distance at which fog begins to appear.
far float	Distance at which fog reaches full intensity.

Properties

color Color

Fog color applied at full intensity.

Color color {};

density float

Density factor for exponential fog (used when type is Exponential).

float density {0.00025f};

far float

End distance for linear fog (used when type is Linear).

float far {1000.0f};

near float

Start distance for linear fog (used when type is Linear).

float near {1.0f};

type Type

Fog attenuation model.

Type type {};

Functions

GetType() Type

Returns the fog type.

Type Fog::GetType() const;