2008

effect by changing the fog color at a nonzero frame with the Auto Key button
on.
Environment Color Map Derives the fog color from a map. You can map the
background and the fog color, you can animate the procedural map parameters
in Track View or Material Editor, and you can opacity-map the fog.
The large button displays the name of the color map, or None if no map is
assigned. The map must use Environmental mapping coordinates on page
7838 (spherical, cylindrical, shrinkwrap, and screen).
To assign the map you can drag a map from a Sample slot or Map button in
the Material Editor (or anywhere else in the software; for example, a projector
map button) and drop it on the Environment Color Map button. A dialog
asks if you want the environment map to be a copy (independent) or an
instance of the source map.
Clicking the Environment Color Map button displays the Material/Map
Browser, where you can choose a map type from the list. To adjust the
environment map's parameters, open the Material Editor and drag the
Environment Color Map button over an unused sample slot.
Use Map Toggles the effect of this map on or off.
Environment Opacity Map Alters the density of the fog.
You assign the opacity map, edit it, and toggle its effect in the same way as
the Environment Color Map.
Fog Background Applies the fog function to the background of the scene.
Type When you choose Standard it uses the parameters in the Standard
section and when you choose Layered is selected it uses the parameters in the
Layered section.
Standard Enables the Standard group.
Layered Enables the Layered group.
Standard group
Thins and thickens the fog based on the distance from the camera.
Exponential Increases density exponentially with distance. When turned
off, density increases linearly with distance. Activate this check box only when
you want to render transparent objects in volume fog.
6510 | Chapter 19 Effects and Environments