Page 1153 - Kitab3DsMax

Chapter 46: Using Atmospheric and Render Effects
Using the Fog Effect
Fog is an atmospheric effect that obscures objects or backgrounds by introducing a hazy layer; objects far-
ther from view are less visible. The normal Fog effect is used without an Atmospheric Apparatus gizmo and
appears between the camera’s environment range values. The camera’s Near and Far Range settings set these
values.
In the Environment and Effects dialog box, the Fog Parameters rollout appears when the Fog effect is added
to the Effects list. This rollout, shown in Figure 46.11, includes a color swatch for setting the fog color. It
also includes an Environment Color Map button for loading a map. If a map is selected, the Use Map option
turns it on or off. You can also select a map for the Environment Opacity, which affects the fog density.
The Fog Background option applies fog to the background image. The Type options include Standard and
Layered fog. Selecting one of these fog background options enables its corresponding parameters.
FIGURE 46.11
The Fog Parameters rollout lets you use either Standard fog or Layered fog.

The Standard parameters include an Exponential option for increasing density as a function of distance. If
this option is disabled, the density is linear with distance. The Near and Far values are used to set the range
densities.
Layered fog simulates layers of fog that move from dense areas to light areas. The Top and Bottom values set
the limits of the fog, and the Density value sets its thickness. The Falloff option lets you set where the fog
density goes to 0. The Horizon Noise option adds noise to the layer of fog at the horizon as determined by
the Size, Angle, and Phase values.
Figure 46.12 shows several different fog options. The upper-left image shows the scene with no fog, the
upper-right image uses the Standard option, and the lower-left image uses the Layered option with a
Density of 50. The lower-right image has the Horizon Noise option enabled.

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