by Travis » Thu Sep 03, 2009 10:16 pm
For the alpha channel, it should be an exact duplicate of the texture, but with monochrome shades replacing everything. For a mirror surface use 0,0,0 (black). For a dull surface, like fabrics, use 255,255,255 (white). However, the reflectivity is cut off at night, so you won't see any reflections after dusk.