Autodesk 12812-051462-9011 User Guide 3 - Page 451

When Affect Alpha is on, the higher the Shadow Brightness value, the more transparent the shadow, allowing the background to show through more, and making the shadow appear brighter. Shadow Brightness Sets shadow brightness. At 0.5, the shadows will not be attenuated on the matte surface; at 1.0, the shadows are brightened to the color of the matte surface; and at 0.0 they are darkened to completely obliterate the matte surface. Color Displays a Color Selector on page 391 to let you choose the color of the shadow. Default=black. Setting shadow color is especially useful when you're using a Matte/Shadow material to composite your shadows against a background image, such as video. It lets you tint your shadows to match pre-existing shadows in the image. Reflection group Controls in this group determine whether the matte surfaces can have reflections. You create matte reflections using a shadow map. TIP Matte reflections don't successfully create an alpha channel unless you render them against a black background. Amount Controls the amount of reflection to use. This is a percentage that can range from 0 to 100. This control is unavailable unless you have assigned a map. Default=50. You can animate this parameter. Map Displays the Material/Map Browser on page 5290 so you can assign a map to use for reflections. The reflection is independent of the environment unless you choose a Reflect/Refract on page 5946 or Flat Mirror map on page 5946. Compound Materials Compound materials combine two or more sub-materials. Compound materials are similar to compositor maps on page 5918, but they exist at the material level. Applying a compound material to an object creates a compound effect that often uses mapping. You load or create compound materials using the Material/Map Browser. Using a filter control, you can choose whether the Browser lists maps or materials or both. 5706 | Chapter 19 Material Editor, Materials, and Maps