[Gmsh] surface meshes and intersecting volumes

[Blackwood, Jay]

I am attempting to produce a surface mesh of a shape that is a composite of intersecting volumes.  When I mesh it in 2D I always end up with the mesh triangles for the surfaces that touch and are inside the composite volume.  For example, if I take two cubes and stack them I end up with a mesh of the "hidden" surfaces that touch.  Another way to say this is that I want to "union" these volumes before I mesh.

I've been through the documentation and haven't found what I need yet.  Is there a simple command or option I'm missing?
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