Oleg,

> I am trying to solve Laplace equation on 2d a little bit complicated area.. 
> It 
> is simulation of river network growth.

Nice application!


> upd: just moment ago figured out that SubCellData() contains exactly what I 
> need! But I still will post this, cos I didn't saw any working example 
> similar 
> to mine and maybe some comments to stack of libraries that I am using.

Yes, that's the way to do it. But you can't set boundary indicators on faces 
that are not actually at the boundary.

Best
  W.

-- 
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Wolfgang Bangerth          email:                 [email protected]
                            www: http://www.math.colostate.edu/~bangerth/

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