[Gmsh] Sphere in a sphere mesh

[Jeremy Theler]

On Wed, 2020-03-04 at 08:25 +0000, Silvia Ceccacci (HDR) wrote:
> Dear all,
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> I would like to generate a geometry where I have a bigger sphere
> (radius=3) and a smaller one inside it (radius=1). Then I want to
> generate a 3D mesh without the sphere inside (so there is a hole in
> the middle of the bigger sphere).
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> I am trying two different approaches, but none of them seem to work:
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> 1) BooleanDifference - I want to take away the smaller sphere from
> the bigger one. This is the code:
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> Sphere(1) = {0, 0, 0, 1, -Pi/2, Pi/2, 2*Pi};
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> Sphere(2) = {0, 0, 0, 3, -Pi/2, Pi/2, 2*Pi}; 
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> BooleanDifference{ Volume{2}; Delete; }{ Volume{1}; Delete; }

This actually works. See attached png.

--
jeremy theler
www.seamplex.com
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