[Gmsh] Merging Surfaces

[Mark van Doesburg]

Hello Mike,


	To clarify my previous message, I build the each surface (patch)
	going from points->lines->line loops->Plane Surface or Ruled
	Surface. I am not merging STL or IGES files.

In that case you have to define the areas where you want the meshes
to touch as a single surface. This same surface should be used in both
surface loops. For example, if you have a small and a large box and want
them to touch at one side, you have to:

1. Define the line loop for the small surface.
2. Define a plane surface for the loop in 1. Use this surface in the
   surface loop of the small cube.  
3. Define a line loop for the large surface.
4. Create a plane surface with the loop from 3 as the outline, and the
   line loop from 2 as a hole.
5. Use the surfaces from 4 and 2 in the surface loop for the large cube.

regards,

Mark.