;)
Cool...
Ok i have a little one other :)
- Export in PLY "Marching cubes" from MagicaVoxel (free) to Mesh Lab (free) - Export in OBJ format
- Import OBJ mesh inside SketchUP 20217 Make (free) by OBJ Plugin by Tig (free) 10 seconds
(import directly OBJ in Moi is not good because there are thousand of little cubes with no Ngons (triangulated) ! :)
- Clean Up plugin (free) by Thomthom = Ngons 3 seconds
- Export OBJ Format from Quad Face tool (6 seconds)

Import in Moi with 8mportOBJ ( object is not "Subdivisable" but totally perfect as Nurbs object ! )

Object on the left is from Magicavoxel after the process above!
( object itself in MagicaVoxel take maybe 3 seconds) it's for that this program is a true gem!

Object on the right is just a Moi Nurbs function applyed


and then with a moment of Inspiration with the object on the right :)


Export file formats from MagicaVoxel (free)


So if a direct importation to Moi will be possible that will be very fine! :)

Else discover the speedy Blender (free) Method! (with some hairs losted...this prog is a mess) :)

Import OBJ (no "Marching cubes" ) from MagicaVoxel : Select the Object ..Edit Mode / Face .... Press F
.
that all : triangulation is gone ... you can export ! :)

_importOBJ by Max Smirnov for MOI
You have a solid (no subdivisable) perfect for nurbs operations!



Some moments of inspiration later! :)

PS Find the ultima Blender Method : a nightmare for find the good process!
- merge by distance - unlimited disolve - clear custom split normal data!

Woks fine directly inside Blender for OBJ or PLY (Marching cubes) in one pass!

Thx to LOLock
https://i.imgur.com/LceY8nu.mp4

So in MagicaVoxel you make this volume in 1 second!
And can of course modify it in Moi3D (if wanted) by import an OBJ without triangulated faces!
_importOBJ by Max Smirnov