I currently have created a model airplane in Blender by drawing a closed volume with triangular planes. I want to do a FEM calculation on this object, meaning I need a fine 3D tetrahedral mesh of this structure. I have looked at threads like (Creating 3D Mesh from stl files with gmsh) which seems similar, but having encountered issues with GMSH detecting the actual volumes from my exported .stl files, I figured I would ask this community for alternative paths before I push on any further. So:
Can anybody think of an alternative to using GMSH? Any open-source meshing programs out there worth considering?