Autodesk 12812-051462-9011 User Guide 3 - Page 1456

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 8034 (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. TIP If you turn on Exponential, this increases the Step Size value to avoid banding. Fog Environment Effect | 6711