feat(grid): add ihc to UnstructuredGrid#2681
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## develop #2681 +/- ##
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+ Coverage 55.5% 72.8% +17.2%
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Files 644 667 +23
Lines 124135 130124 +5989
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+ Hits 68947 94741 +25794
+ Misses 55188 35383 -19805
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discussed offline with @jlarsen-usgs |
wpbonelli
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Jan 31, 2026
Improve the shared face finding algorithm for HFB (Horizontal Flow Barrier) plotting. Factor out @jlarsen-usgs's index-based approach from #2671 into reusable function(s) and use it instead of floating point comparisons as before. Should be faster. I moved the new face-related functions to a new module faceutil.py instead of plotutil.py as they are used not only for plotting but for export, and may be useful in other cases. I considered putting them in gridutil.py but that is used by the grid classes, while the face functions use the grid classes, so it would have created a circular import. I also changed the name of is_vertical_barrier -> is_vertical and inverted the semantics so it works on faces, not barriers (a face between horizontally adjacent cells is a vertical polygon, and a face between vertically adjacent cells is a horizontal polygon, but we call the former a "horizontal" flow barrier and the latter a "vertical" flow barrier). I figure writing these utils in terms of faces for the general case makes sense, and just interpreting the results for the specific case of HFBs. This PR builds on - #2671's shared face finding approach - #2680 which gives all grid types a consistent get_node() method - #2681 which adds an ihc init parameter/attribute to UnstructuredGrid Some ad hoc cell ID -> node number conversion utilities are removed and get_node() used instead. I am classifying all this a refactor though it introduces a new utility module, as the new utils are in service of the refactor.
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Add
ihc(horizontal connection) init parameter and property toUnstructuredGridand populate it from the DISU package when initializingMFModel.modelgrid. Then use it for vertical barrier detection inplotutil.pyinstead of floating point comparisons on coordinates, if available (but don't assume it's available).