In addition to the previous message. I created vtk mesh with values in field "node_groups" to be 1 or 2. When I use 'vertices of group 0' sfepy works without errors, but set this region to every single vertex in the mesh, and I don't have values 0 in 'node_groups' field. When I change 0 to 1 or 2 it raises error. Apparently sfepy just ignores 'node_groups' field.

On Sun, Feb 2, 2020 at 10:16 AM <> wrote:
regions = {
    'Omega' : 'all',
    'Gamma_Left' : ('vertices in (x < 0.00001)', 'facet'),
    'Gamma_Right' : ('vertices in (x > 99.099999)', 'facet'),
    'GammaIn': ('vertices of group 0', 'edge'),

The group I am struggling with is GammaIn. I was using as an example when I was creating my vtk mesh. Am I right in my assumption that it is enough to add field "node_groups" to my vtk and sfepy will gather information of the group number from this field?
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