Hi there, I have this really complex geometry as a mesh and i need to convert it to a nurbs so i can create a Gcode in Grasshopper for Concrete 3D printing, does anyone have an idea of how could I make it??
Or if the only way is redo the model from the beggining??
I cant upload it because is very heavy.
Thank you in advance!!
I think you can give it a try with QuadRemesh.
and how do i get the nurb from that?
You can get the NURBS from SubD object via ToNurbs command,
but that needs lots of memory and time to convert
The QuadRemesh and ToNurbs does not work well with meshes with high detail (large# of triangles)
If you are 3D printing, why can’t you use the mesh you already have?
There are decimation tools that can work well to make a smaller mesh while preserving the detail, although you will need to get another app to do that. Here’s one that works well and is relatively inexpensive Balancer nPro
because its for Concrete 3D printing and I do the Gcode myself with grashopper and if its not a brep it doesnt work propertly 
Your workflow is not appropriate for high detail, sculptural forms. Converting those to nurbs will inevitably result in a loss of detail and/ or sharpness.
My opinion is that you need to rethink the need to have a brep and find a different way to generate the Gcode from a mesh. This is not a Rhino issue, its an inherent limitation of converting complex meshes (like scan data) to nurbs.
If you want to know the limitations involved with mesh to nurbs process, you should research reverse engineering.
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