3D Fog

3D Fog applies a mist to the entire image in a rich pixel rendering.

Note: The 3D Fog effect uses the Z (Z Depth) channel. It does not require the channels Non-clamped Color, Coverage, Color, Transparency, or Sub-pixel Weight to be present (the latter three are not available for RLA files). If present, the channels are used to improve the quality of the effect.

Falloff Distance

Specifies a gradual onset of the fog so that objects in the foreground are less obscured than objects in the background. A falloff value of zero creates a solid wall of fog that begins abruptly.

Near Plane

Determines where the fog begins in 3D space.

Fog Thickness

Controls the thickness of the fog.

Color 1 and Color 2

The color of the fog can vary from the bottom to the top of the image. For example, the fog could be green close to the ground and go to white toward the top of the image. To create this effect, you assign two colors to the fog, and specify the opacity and position of each color.

To specify a color, click the color box and use the color picker to set the color, or click the color picker and then sample a color from the image in the viewport.

Color Opacity

Sets the opacity of color 1 or color 2.

Color Position

Determines the portion of the image which is covered by that color. When the Position of Color 1 and Color 2 overlap, a gradient is created.

Affect Mask

Applies fog to areas normally made transparent by the alpha channel.

Correct Edges

Uses the Coverage G-Buffer channel to apply fog correctly around the edges of objects.

Fog Source

Specifies another layer in the composite to use as the fog source, in addition to the gradient colors. This allows you to use real footage or animated textures for fog, like fractal noise or turbulence.