Cylinder like 3D geometry

Hi, I defined some 2D geometry (using mshr) and i want to create a cylinder like 3D geometry where i use the base 2D geometry and extend it to some fixed hight to mesh it with tetrahedrons later. Any idea how can I do this? Thanks!

mshr is long deprecated. Consider instead using gmsh.

For anyone reading this, as the former answer was not very specific, I found out that the “extrude” function of gmsh does create cylinder like geometries from planar surfaces.