Nurbs mesh for STL file

[Aminofa70]

Dear @hyrodium

Can we use your package to generate a volumetric mesh for a STL file, to be used in IGA analysis.
Using the following code I can get the surface triangle mesh. If we need a volume triangle mesh as well, I can generate it through the use of tetgen. I need this data within the volume: :knot_vectors, :orders, :control_points, :weights

Thank you so much in advance.

using Geogram
using Comodo
using FileIO

fileName_mesh = joinpath(geomgramjl_dir(),"assets","obj","femur.obj")
M = load(fileName_mesh)
F = [TriangleFace{Int64}(f) for f in faces(M)] ## boundary face
V = [Point{3,Float64}(v) for v in coordinates(M)] # boundary vertices
# Remeshing the surface 
n1 = 8000 
F1,V1 = ggremesh(F,V; nb_pts=n1)

[hyrodium]

Thank you for the comment!
Could you clarify the desired input and output?

This package BasicBSpline.jl can be used to define volumetric B-spline solid, but there is no support for triangular mesh (e.g. STL) exports.

[Aminofa70]

Thanks for your response. Actually I don't need to export it to STL file. I want to do reverse, I mean get the surface geometry of a STL file that is triangle, for it I do the following

using Geogram
using Comodo
using FileIO

fileName_mesh = joinpath(geomgramjl_dir(),"assets","obj","femur.obj")
M = load(fileName_mesh)
F = [TriangleFace{Int64}(f) for f in faces(M)] ## boundary face
V = [Point{3,Float64}(v) for v in coordinates(M)] # boundary vertices

If the number of vertices V and faces F are very dense, I can do re-meshing for surface to have less points, so using the following code

n1 = 8000 
F_tri, V_tri = ggremesh(F,V; nb_pts=n1)

So, I have the faces F_tri and vertices V_tri only for the boundary, not volume, which the faces are triangle.
Can we generate volumetric B-spline solid for this inputs: F_tri, V_tri and return knot_vectors,orders,control_points,weights from B-spline.
I WANT TO USE THE B-SPLINE MESH FOR ISO-GEOMETRIC FINITE ELEMENT ANALYSIS
If these input data are not enough, could you please let me know what data do we need as input, then I can try to provide them,

Thanks in advance and cheers

[Aminofa70]

I just realized that I can even convert triangle surfaces obtained to quadface using

Fq,Vq = tri2quad(F_tri, V_tri ; method=:split)