JorgeESantos commented 1 year ago

Greetings everyone! I'm working with TPMS meshes for FEM modulation and I've been trying to generate tetrahedral meshes from triangular meshes using Trimesh method gmsh.to_volume(). I was successful in achieving what I wanted if I smooth the mesh using the standard Laplacian smooth filter. However, if I try to generate the tetrahedral mesh without any smoothing or with a mutable Laplacian smooth method, gmsh.to_volume() fails and raises the following error "Error: Invalid boundary mesh (overlapping facets) on surface 1 surface 1".

My question is why this error occurs and how do I fix or work around it in order to build the tetrahedral meshes I'm looking for. Here is the code I'm using:

`from functions import TPMS_engine, Mesh_Volume

M, voxel_lenght, mesh_data = TPMS_engine([2,2,2], elem=40, iT=0.5)

M is a binary image that I used to generate the mesh

import trimesh mesh = trimesh.Trimesh(vertices=mesh_data[0], faces=mesh_data[1])

mesh generated from vertices and faces

from functions import trimesh_repair_mesh mesh = trimesh_repair_mesh(mesh_data[0], mesh_data[1]) trimesh.repair.fix_winding(mesh)

tried to fix the problem on my own but none of the repair functions available seem to have any impact

import trimesh

mesh_smoothed = trimesh.smoothing.filter_laplacian(mesh)

this is the condition that makes the conversion works

from trimesh.interfaces import gmsh import os dire = 'G:\O meu disco\Disciplinas\JF\Parte 3 Abaqus JF' bdf_name = os.path.join(dire, 'Gyroid_1x1x1_1.bdf')

stl_name = os.path.join(dire, 'FKS_2x2x1_smoothed.stl')

gmsh.to_volume(mesh, file_name=bdf_name, mesher_id=7)

this one fails

gmsh.to_volume(mesh_smoothed, file_name=bdf_name, mesher_id=7)

this one works`

Error trimesh

tanuj163 commented 6 months ago

Hi, were you able to solve the issue ?

JorgeESantos commented 6 months ago