creating solid geometries from gempy voxel model

[nlosacco]

Hi all,
I'm trying to use gempy as a part of a workflow moving from geological surveys to numerical modelling of deep landslides.
For this, I need to build a solid geometry, e.g. for subsequent Finite Element meshing. I know that the voxel model resulting from gempy can be used as a mesh for the FEM program MOOSE, but that is not what I need.
Do you have any suggestion about how to do this? Some random ideas:

1. use get_surfaces and interpolate a surface through the vertices
2. interpolate boundary voxel vertices or (better) centroid of boundary voxel faces. I have no idea about how to do it, but something similar seem to be performed by gempy itself in 2D sections, for instance see the continuous smooth lines bounding different strata in https://www.gempy.org/tutorials . How are they obtained? is it possible to get the same in 3D?
   Any help or suggestion is much appreciated.

[nlosacco]

Now, get_surface and returns a point cloud that can be mostly approximated with a smooth surface but for the part adjacent to the fault. This part of the surface, instead, is staggered, sort of following the voxel discretisation. Have you got any ideas about how to get rid of that? This would solve the problem