3D Lut workflow between SpeedGrade and Nuke

Does anyone have a working workflow to create 3d Lut from SpeedGrade, and then using them in Nuke ( lets say version 5.2Vx to keep things simple) ?

Maybe i’m missing something, but i don’t think i can export vector field,
The only format that seems compatible is the .3dl format, but for some reason a get a weird error message from nuke, telling me that i have negative or zero values.

After comparing the file header of a compatible .3dl file agaisnt the one comming from speedgrade, it seems that compatible files a formated in a 32x32x32 matrix, and speedgrade is outputting a 3D Mesh.

Does it makes sens to anyone ?
Few inputs would be appreciated here
Thanks

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