I think LUT function is great on RT but I have a question.
Is so difficult to implement compatibility with 3DLUT (in .cube format)? There are so much preset all over the internet in that format, not so much as HaldClut.
Thank you
Looks quite doable to me. Another option would be to just hack a little converter. 
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I don’t think it’s difficult necessarily, just that nobody has seen the need so far and stepped up to create a means for using it in RT. You can use .cube files in G’MIC/GIMP (and PhotoFlow) right now, though. So if you really wanted one you could apply a .cube LUT to a HaldCLUT identify file and just use that for now?
I’ll bet someone might write it if we buy them a few beers! 
Now I’m trying to convert all my .cube to HaldCLUT, I’ll upload as soon as possible if it’s useful. Mine was an idea just to say that cube format seems to be the standard. But, if someone wants some beer (or some Italian wine) to do that I could help. Thank you for keeping RT my favorite raw processor, even better