[Gmsh] Refine the mesh around the line

[Gladiator Gladiator]

Hello Gmsh users,
Would you please some one kindly inform me how I can refine the mesh around a specefic line in 2D and 3D meshes?For instance I want to refine a Square or Cube with unstructured quad or triangular mesh around its diameter (two gmsh files have been attached).Thanks for your considerations,Look forward to your kind response,

Best,
Glad
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