Thickening surface

[czc98]

Hi!
Hello, I have a non-closed mesh and would like to generate a closed mesh that envelops it, using the original as a reference. I've tried mesh offsetting and Marching Cubes, but neither approach has achieved my goal.
origin_mesh

target_mesh

Does MeshLib have a function that can achieve something similar—wrapping around a surface like this?

My idea was to use isosurface extraction, but the results I got are strange.

import meshlib.mrmeshpy as mr

voxel_size = (0.2,0.2,0.2)
signed = False
surface_offset = 3

mesh = mr.loadMesh("models/origin.stl")
params = mr.MeshToVolumeParams()
params.voxelSize = mr.Vector3f(voxel_size[0],voxel_size[1],voxel_size[2])
params.type = mr.MeshToVolumeParams.Type.Signed if signed else mr.MeshToVolumeParams.Type.Unsigned
params.surfaceOffset = surface_offset

vdb_volume1 = mr.meshToVolume(mr.MeshPart(mesh),params)
volume = mr.vdbVolumeToSimpleVolume(vdb_volume1)

#marching cubes on simple volume
marching_cubes_params = mr.MarchingCubesParams()
marching_cubes_params.iso = 0.52
inferred_mesh3 = mr.marchingCubes(volume,marching_cubes_params)

mr.saveMesh(inferred_mesh3, "output/mesh.stl")

[Fedr]

Have you tried Shell option from Offset tool:

Is it the same thing you try to achieve?