private SpeciesId CreateDummyTracker(IEnumerable <DGField> Fields) { var gDat = Fields.First().GridDat as GridData; var DummyLevSet = new LevelSet(new Basis(gDat, 1), "DummyPhi"); DummyLevSet.AccConstant(-1.0); LsTrk = new LevelSetTracker(gDat, XQuadFactoryHelper.MomentFittingVariants.Saye, 1, new[] { "A", "B" }, DummyLevSet); LsTrk.UpdateTracker(0.0, __NearRegionWith: 0); var spcA = LsTrk.GetSpeciesId("A"); Debug.Assert(LsTrk.Regions.GetSpeciesMask(spcA).NoOfItemsLocally == gDat.Cells.NoOfLocalUpdatedCells); return(spcA); }