[Dune] globalRefine and ALUGRID_SIMPLEX

[Andreas Dedner]

Martin Nolte wrote:
> There are 3 different ways of subdividing a tetrahedron into 8 smaller 
> tetrahedra. Depending on the chosen variant, this leads to different 
> centers. As far as I know ALUGrid, chosen variant depends on the order 
> of the vertices.
> It may be a clever idea to sort them such that version produce the same 
> output. This might need some complex change in the DGFGridFactory of 
> ALUGrid, though.
> 
> By the way: The number of tetrahedra is the same for both DGF files, 
> since 6*8 = 8*6 (i.e. make6 + red refinement = red refinement + make6).
> 
OPS: you are right - I got confused here...
So I guess Martins explanation is right.