Degenerate 2D cells

[Camille Sautot]

Hello,

I use mshr to mesh a 2D square holed in a corner but there are degenerate cells around the hole. I see there is a command to remove degenerates in 3D. What is the solution in 2D ?

Thanks.

CS

[Benjamin Dam Kehlet]

Hello!

There is no direct equivalent i 2D (the underlying mesh generator engines are very different i 2D and 3D).

At an earlier stage in the development edges shorter than a given tolerance would be truncated in the PSLG (the input to the mesh generation engine). msh now takes a different approach for handling round off errors and I assumed incorrectly that was not needed anymore. I will reintroduce that.

As a workaround for now give a third argument when creating the Circle (that controls the number of segments when creating the polygon that approximates the circle. 25 works fine here.

geometry = Rectangle(Point(0,0),Point(2,2)) \ - Circle(Point(0,0),0.5, 25)

I'll be back soon :-)

[Benjamin Dam Kehlet]

I have pushed an attempt to fix this now. Let me know if this does not work for you.