Hi, I have been looking into creating a coloured light mod for Minecraft, and the far the best idea I have come up with would be to enlarge the lightmap that minecraft uses to render sky light and block light together.   However, to reference a point on the light map Minecraft uses a short coordinate value so light values (0-15) can be mapped directly to the texture.  The problem I am having is when I try to reference a point in a larger lightmap (say 32 by 32 or 4096 by 16) the coordinates s