[Gmsh] Embedded Mesh

[Jensen, Aaron J.]

Hello,

I would like to merge an existing mesh into a geometry and then mesh the unmeshed region using gmsh (something like a boundary mesh around a pre-existing mesh generated externally by another program).  Ideally, this would result in a mesh that was partially created in gmsh and partially created externally to gmsh.  Ultimately, I would like to do this in both 2D and 3D but am starting with the following in 2D:



Merge "square";

SetFactory("OpenCASCADE");

Surface Loop(1) = {1};
//sExternal = news;
//Rectangle(sExternal) = {0, 0, 0.0, 0.5, 0.5};

s1 = news;
Rectangle(s1) = {-0.25, -0.25, 0.0, 1.0, 1.0};

//BooleanDifference (2000) = { Surface{s1}; Delete; }{ Surface{sExternal}; };
BooleanDifference (2000) = { Surface{s1}; Delete; }{ Surface{1}; };



OpenCascade doesn't recognize surface 1 and BooleanDifference causes gmsh to crash.  I assume I am doing something wrong?  Can gmsh embed an existing mesh into a gmsh geometry or CAD model?

Thanks,
Aaron
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