Volumetrics

Eevee simulates volumetric scattering by evaluating all volume objects inside the view frustum.

To achieve this, Eevee uses several 3D textures which have a high video memory usage. The texture dimensions can be tweaked using the Tile Size and Samples parameters.

Object volumes have some limitations.

Reference

Panel:: Properties ‣ Render ‣ Volumetrics

Start: Start distance of the volumetric effect.
End: End distance of the volumetric effect.
Tile Size: Controls the quality of the volumetric effects. Lower size increases video memory usage and quality. This is the size in pixels of a volumetric cell.
Samples: Number of samples to compute volumetric effects. Higher count increases video memory usage and quality. These samples are distributed along the view depth (view Z axis).
Distribution: Blend between linear and exponential sample distribution. Higher values puts more samples near the camera.

Volumetric Lighting

Let the volume scattering scatter light in the scene. Unnecessary if no Volume Scatter is present in the scene.

Light Clamping: Clamp light contribution of the volume scattering effect. Reduces flickering and noise. Set to 0.0 to disable clamping.

Volumetric Shadows

Approximate light absorption of the surrounding volume objects. This makes the volumes more opaque to light. This is a very computationally expensive option and has limitations.

Samples: Number of samples to compute volumetric shadowing.