Autodesk 12812-051462-9011 User Guide 3 - Page 1471

Lights group Pick Light Click the light that you want to enable for volume light in any viewport. You can pick multiple lights. Click Pick Light and then press H. This opens the Pick Object dialog, which lets you choose multiple lights from a list. Remove Light Deletes a light from the list. Volume group Fog Color Sets the color for the fog that makes up the volume of the light. Click the color swatch, and then choose the color you want in the Color Selector on page 391. You can animate the color effect by changing the fog color at a nonzero frame with the Auto Key button on. Unlike the other fog effects, this fog color combines with the color of the light. Possibly the best effect is to use white fog and then color it with a colored light. Attenuation Color Attenuates volume light over distance. The volume light ramps from the Fog Color to the Attenuation color over the light's Near and Far attenuation distances. Clicking the color swatch displays a color selector so you can change the attenuation color. Attenuation Color interacts with Fog Color. For example, if your fog color is red and your attenuation color is green, in the rendering your fog will shade to purple. Typically the attenuation color should be very dark and neutral-black is a good choice. Use Attenuation Color Makes attenuation color active. 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. Density Sets the density of the fog. The denser the fog, the more the light reflects off it inside the volume. Densities of 2 to 6 percent probably make the most realistic fog volumes. 6726 | Chapter 21 Effects and Environments