[Gmsh] Not getting a volume mesh

[Wayne Christopher]

I'm trying to mesh a volume defined by surfaces that are defined by 
tessellations.  I don't want the mesh to be based on the surface 
triangles - those are purely geometry and in most cases finer than the 
volume mesh that I want.

When I run gmsh like this:

gmsh try1.geo -3 -format msh -saveall -smooth 3 -o try1-out.gmsh

(files attached) I do not get any tetras in the output, and it appears 
that the output mesh is a refinement of the input mesh.

What am I doing wrong?  Thanks,

     Wayne

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