yeah the specular is in the alpha layer .. its a spec map nonetheless Also the size of the shadow mesh only applies in certain situations.. An example would be like a cube.. with another cube as its shadow mesh.. If both are the exact same size and everything you will get a perfect shadow.. Now if you have the shadow mesh being bigger than the actuall model you might expect almost all the model to be shadowed , and it would look bad -.- So if your shadow mesh isnt exactly the same size.. i would advise you to shrink it down a bit.. unless you have a reason for keeping it the way it is.. or increasing its size But a shadow mesh that is too small can look bad too -.- But yeah shadow mesh is what gives units their shadows on the ground and ect ect.. so you might want to check yours out or give us apic of how its set up so we can help you better