None

Select this option when creating a lit fog effect without an additional background

Clouds

Specifies a sky background with a background color and clouds

Scale

Specifies the cloud scale (1 – 10); enter a larger value for larger cloud sizes

Background Color

Select a background color for the sky

Cloud Color

Select a cloud color

Detail

Specifies the level of cloud resolution; drag the slider to the right to specify a greater level of detail (requires longer rendering times)

One Color

Specifies a background with one color; click Options to select the color

Two Color

Specifies a background with two colors which blend to form a gradient; click Options to select the colors

Top Color

Select the color for the start of the color gradient at the top of the page

Bottom Color

Select the color for the end of the color gradient at the bottom of the page

Image

Uses a specified image for the background (see Creating Image Backgrounds)

Image Environment (HDRI)

Uses a panoramic High Dynamic Range Image (HDRI) file for the background (see Creating HDRI Backgrounds )

Physical Sky

Uses environment lighting to realistically simulate various sky conditions (see Creating Physical Sky Backgrounds )

Lit Fog

Creates volumetric lighting effects, such as a shaft or cone of scattered light in fog, haze, or smoke. A point or spot light object must be inserted in the drawing, and Lit Fog must be selected in the Object Info palette for the light source object.

Lit fog cannot be applied to directional, area, or line lights.

Fog Density (%)

Specifies the fog density; enter a larger value to increase the density of the effect

Fog Consistency

Creates either a smooth or uneven fog effect

Receive Shadows

Allows the effect to be blocked by solid objects, creating shadows; for example, when blocking a shaft of light by a table, so that light does not display under the table

Use Shadows must also be selected in the rendering options.