On 07/15/2016 08:27 AM, Marek Čapek wrote:

An error occurred in line <1713> of file
</home/marek/SECONDARY/Libraries/numerics/candi/tmp/unpack/deal.II-v8.4.1/source/grid/grid_reordering.cc>
in function
     static void dealii::GridReordering<dim,
spacedim>::invert_all_cells_of_negative_grid(const
std::vector<dealii::Point<spacedim> >&,
std::vector<dealii::CellData<dim> >&) [with int dim = 3; int spacedim = 3]
The violated condition was:
     n_negative_cells==0 || n_negative_cells==cells.size()

For the record, what this exception means is that there were some cells that had a negative volume (but not *all* cells, in which case deal.II would automatically have inverted every cell). This typically indicates that the generated mesh has a few cells that are degenerate or inverted.

The error message is, admittedly, not very useful. I'll write a patch.

Best
 W.


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Wolfgang Bangerth               email:            bange...@math.tamu.edu
                                www: http://www.math.tamu.edu/~bangerth/

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