[Gmsh] surface problem with splines

[Francois Lemery]

Hi, I am trying to build a cylindrical non-linear horn.  I used the Spline
function to link three circles on a line but as you can see in the attached
picture, the generated surface based on the spline avoids the intermediary
circle.  Is there a way to obtain the intermediary point/line to make
smaller surfaces and then loop over them later? I've attached the code for
reference. Thanks, Francois
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