[Gmsh] Meshing composite volumes

[Martin Vymazal]

Hi Theodore,

 you need to tell gmsh that the surface contains a hole. Define two line loops - one for the 
contour of the external polygon (say Line Loop 1) and one for the contour of the ellipse (say 
Line Loop 2). Then you define your surface for meshing as 

Plane Surface(1) = {1,2}; // Subtract the interior of line loop 2 
					 // from the 
interior of line loop 1

See section 5.1.3 in gmsh reference manual or tutorial 3 on gmsh website. 

If you don't have any lines to create line loops from (since you're loading an stl file), take a 
look at 'CreateTopology'.

Best regards,

   Martin Vymazal

On Tuesday 30 April 2013 12:32:34 Ted Kord wrote:


Hi,



I have an STL mesh consisting of an irregular ellipsoid in an irregular polygon. When I turn off 
'surface faces' in the 'Options - Mesh', I can see the ellipsoid in the polygon. What I'd like to 
do is mesh just the containing polygon excluding the ellipsoid, i.e., the final mesh will have a 
hole where the ellipsoid should be. How can I do this in gmsh?






Theodore




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