[Gmsh] transfinite mesh with progression factor != 1.0

[Tom De Vuyst]

Hi Christophe,

I have a question regarding the creation transfinite meshes on a 
rectangle with a progression towards one edge (see attached geo file and 
tutorial t6.geo). I would like to use this to create boundary layers. 
However the bias towards the edge is different in the centre of the 
rectangle than on the edges, so the result is a 'bumpy' boundary layer. 
Is there a way to overcome this and obtain straight lines? In version 
1.65 this was the case.

Thank you.

Tom

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