Exponential Fog
The High Definition Render Pipeline (HDRP) provides a type of fog called Exponential Fog. Exponential Fog enables you to increase the density of the fog exponentially from the Camera position until it reaches a maximum density at a distance which you can customize. This produces more realistic fog effects than Linear Fog.
Using Exponential Fog
Exponential Fog uses the Volume framework, so to enable and modify Exponential Fog properties, you must add an Exponential Fog override to a Volume in your Scene. To add Exponential Fog to a Volume:
- Select the Volume component in the Scene or Hierarchy to view it in the Inspector.
- In the Inspector, navigate to Add Override > Fog and click on Exponential Fog.
After you add an Exponential Fog override, you must set the Volume to use Exponential Fog. The Visual Environment override controls which type of fog the Volume uses. In the Visual Environment override, navigate to the Fog section and set the Type to Exponential Fog. HDRP now renders Exponential Fog for any Camera this Volume affects.
Properties
| Property | Description |
|---|---|
| Density | Use the slider to set the maximum density of the fog. This acts as a global multiplier. Higher values produce thicker fog. |
| Fog Distance | The distance from the Camera at which the fog density roughly reaches the value you set in Density. Because the attenuation curve for the fog density is exponential, this is not the precise distance at which the density is at its maximum value. |
| Fog Base Height | The height (in world space) at which the fog density begins to decrease. |
| Fog Height Attenuation | Use the slider to set the speed at which the density of the fog decreases with height (in world space). |
| Max Fog Distance | The maximum distance of the fog from the Camera. |
| Color Mode | Use the drop-down to select the mode HDRP uses to calculate the color of the fog. • Sky Color: HDRP shades the fog with a color it samples from the sky cubemap and its mip maps. • Constant Color: HDRP shades the fog with the color you set manually in the Constant Color field that appears when you select this option. |
| - Mip Fog Near | The distance (in meters) from the Camera that HDRP stops sampling the lowest resolution mip map for the fog color. To expose this property, select Sky Color from the Color Mode drop-down. |
| - Mip Fog Far | The distance (in meters) from the Camera that HDRP starts sampling the highest resolution mip map for the fog color. To expose this property, select Sky Color from the Color Mode drop-down. |
| - Mip Fog Max Mip | Use the slider to set the maximum mip map that HDRP uses for the mip fog. This defines the mip map that HDRP samples for distances greater than Mip Fog Far. To expose this property, select Sky Color from the Color Mode drop-down. |
| - Constant Color | Use the color picker to select the color of the fog. To expose this property, select Constant Color from the Color Mode drop-down. |