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Lumberyard
User Guide (Version 1.14)

Console Variables for Volumetric Fog

You can specify the following console variables (CVARs) to enable volumetric fog effects. For more information, see Using the Console Window.

Console Variable Description Values

e_VolumetricFog

Toggles the Volumetric Fog component on or off.

0 = Off

1 = On

r_VolumetricFogTexScale

Sets the width and height of the internal volume texture. Screen resolution divided by this factor is applied to the width and height of the fog volume.

The minimum value should be 2.

r_VolumetricFogTexDepth

Sets the depth for the internal volume texture. This value should be multiples of 4, but less than 252.

r_VolumetricFogReprojectionBlendFactor

Sets the blending factor of the temporal reprojection filter. Higher values cause less flicker, but more ghosting. 0 = Turn off temporal reprojection.

r_VolumetricFogReprojectionMode

Sets the mode of ghost reduction for the temporal re-projection filter.

0 = Conservative mode. Ghost artifacts can appear when a light moves, but there is less flicker than in the advanced mode.

1 = Advanced mode. This mode has fewer ghost artifacts but slightly more flicker than the conservative mode.

r_VolumetricFogSample

Sets the number of sample points.

0 = 1 sample point in a voxel.

1 = 2 sample points in a voxel.

2 = 4 sample points in a voxel.

r_VolumetricFogShadow

Sets the shadow sample count for each sample point.

0 = 1 shadow sample per sample point.

1 = 2 shadow samples per sample point.

2 = 3 shadow samples per sample point.

3 = 4 shadow samples per sample point.

r_VolumetricFogDownscaledSunShadow

Replaces sun shadow maps with downscaled shadow maps or static shadow maps, if possible. This reduces the volumetric fog flicker for sun shadow.

0 = Disabled.

1 = Replace first and second cascades with downscaled shadow maps. Others are replaced with a static shadow map, if possible.

2 = Replace first, second, and third cascades with downscaled shadow maps. Others are replaced with a static shadow map, if possible.

r_VolumetricFogDownscaledSunShadowRatio

Sets the downscale ratio for sun shadow maps.

0 = 1/4 downscaled sun shadow maps.

1 = 1/8 downscaled sun shadow maps.

2 = 1/16 downscaled sun shadow maps.

r_VolumetricFogMinimumLightBulbSize

Sets the minimum size threshold for light attenuation bulb size for voxel-based volumetric fog.

Note

Small bulb sizes can cause light flicker.

Specify a value between 0 to 2.

Default value: 0.4