I had deleted this one in my message above, because it worked within U3D, didn't check in b3d though, so....
2. In Unwrap3D, a composite texture must be used, and your lightmap texture
must be loaded in the 2nd slot (Light/Detail). 'UVset 2' must be selected.
2. In Unwrap3D, a composite texture must be used, and your lightmap texture
must be loaded in the 2nd slot (Light/Detail). 'UVset 2' must be selected.