With MAX 5 and higher you can render your lightmap directly with the 'render to texture' feature. You must be sure you render to texture channel 1 instead of the default 2. Kill the material that is produced by max but keep that modifier it adds ('flatten uv' or something...).
Now you load your lightmap in Blitz and set it to channel 1. I think that was all, but there was also a tutorial in the tutorials section on this side.
Mac
Now you load your lightmap in Blitz and set it to channel 1. I think that was all, but there was also a tutorial in the tutorials section on this side.
Mac