> (1) What needs to be done to guarantee that sphere.msh is
> identical(conforming) to the portion of box.msh that accounts for the sphere?
> Or am I missing something again in your idea to extract the sphere.msh
> portion directly from box.msh?
Ah, O. K., this is extra. For this, the interface (i.e. the sphere) needs to
be defined as a Physical Surface in the common file.
> (2) If I need to generate a third portion of the box.msh that accounts for
> the volume= cube/sphere( sphere subtracted from the cube), do I need to
> create cube/sphere.geo and insert geomtry.geo into it as you have shown me or
> it is just the volume(2) you had in your last reply, that is:
>
> Volume(1) = {1}; // the sphere
> Volume(2) = {1, 2}; // outside the sphere
Yes, that's right: the second volume is the complement of the sphere in the
cube. To see that the box.msh is hollow apply Tools/Clipping/Mesh with (A, B,
C, D) = (1, 0, 0, -0.5). See attached box-clipped.png. (This was meshed with
"gmsh -3 -clscale 0.0625 box.geo".)
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