[Gmsh] Two models share the same interface

[Henry Liu]

Hi, Gmsh teams
 
I want to build a model that consists of two blocks with different materials. The two blocks are connected  together at the interface between them. So the resulting 3D mesh should be having the exact nodes at interface between two blocks and output mesh file has material property definition for each block.  
 
I have tried to use 'extrude' command and 'function' to build the model. There is no problem to build an isolated block, but the problem is how to make two blocks connect together. Can someone give some advice at this point?
 
Thanks a lot for kindly help!  
 
henry

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