Hi Stéphane,

Is it possible to use two overlapping meshes and to project information from 
one mesh to the other one ? Since this question is unclear, here is an example:
1) Suppose I have two meshes:
- a first one covering a certain volume,
- a second identical to the first but with an extension so that it covers a 
bigger volume. In the common region, element, nodes positions and numbering are 
identical.

2) I would like to solve a physical problem on the first mesh and  use the 
results as data for the second physical problem (solved on the second mesh). I 
think it would involve somesthing like this :

mesh M1 = read(gmsh,"small mesh.msh");
mesh M2 = read(gmsh,"large mesh.msh");

// Initial values
femfunction t1(M1)=0;
femfunction t2(M2)=0;

//..  solve a first problem on M1 to get t1
//then

t2=t1;  //Projection of t1 on t2 on the common part

//.. solve a second problem using t2 as property

One of the problem, I think is to define the value on the non-common region (a 
constant value would be OK).
Is it possible with ff3d?

Thanks,

Dominique.

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