Hello, I am currently trying to generate a blood vessel network (I only need to mesh the exterior surface of the vessels, not the interior) and was initially interested in the "meshing based on centerline" feature from VMTK/gmsh. My idea was to create my own centerlines.vtk file (not sure it could have been easily done), with a self-created centerline path and its associated "MaximumInscribedSphereRadius" and use the approach described here http://www.vmtk.org/tutorials/CenterlinesGmsh.html to build a mesh around the centerlines. Instead of building my geometry pipe after pipe, I was willing to simply define a network of centerlines, with bifurcations and merging of the vessels, and use the VMTK and gmsh functions to build the mesh around the centerlines. However it appears that the Centerline field feature has been removed from the latest versions of gmsh 773b9d8b. I know how to build a geometry step by step, adding pipe after pipe to create my network (using tutorial 19), but I was wondering if there was a smarter/more efficient way to create my blood vessel network, for example using a centerline description. My objective is to create a STL file describing the exterior surface of the vessels, file which will be used within a CFD solver. Thank you!