sorry for my strange answer. i didn’t have much time then…
why does the fx-guy need your lut? in my case the fx guy didn’t want to use the
original 3ds (too slow to work with). so we decided that i do a pre-grade and then
give him that prores444 files at 2,5k in log. that way he could work well and fast
and i didn’t lose too much information in terms of dynamic range for the final grade.
but what is your situation exactly? did you generate the 3d-lut in resolve and it didn’t
work or was there some other problem? (look into the manual, there is a chapter which
explains the 3d-lut generating, you just have to load a certain dpx file etc.)