about hexahedra mesh generate
I am currently engaged in a project that necessitates the generation of either all-tetrahedral or all-hexahedral meshes for various geometrical configurations related to GIS. I've observed that Gmsh effortlessly generates tetrahedral elements. However, when it comes to generating hexahedral meshes, it seems my only option is to use the subdivisionAlgorithm to convert tetrahedral meshes into hexahedral ones. I also explored using the transfinite algorithm and recombine3DAll, but the recombine option doesn't seem to work, and the transfinite algorithm might not meet my requirements.
Is there an alternative method within Gmsh for generating hexahedral meshes directly? I am particularly interested in employing the frontal-Delaunay for quads or quasi-structured quad as the 2D algorithm, aiming to produce hexahedral meshes resembling a rectangular prism. Thank you for your assistance t1.geo