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Kristian Bendiksen
d6722f4ba8
Adds a compact FIPNEST/FIPSLOT/REFINE encoding of the nested hybrid grid parent-child relations that can travel inside the INIT file instead of the OLDIJK sidecar: FIPNEST is the 1-based flat natural index of each cell's immediate parent (refined-away host slots carry their own link so every chain terminates at a coarse cell), FIPSLOT packs the within-parent i/j/k offsets, and REFINE is the existing per-cell level. FIPNEST alone is provably insufficient: the refinement level is not the parent-chain depth (L2 and L3 both refine the coarse grid directly in the DROGON dataset), and within-parent placement is ambiguous from flat coordinates when a level has hole layers. RigNestedHybridGridFipnestCodec derives the arrays from the sidecar input by mirroring the reconstructor's level classification, and synthesizes an equivalent reconstruction input back from them (identical up to per-level constant TMP shifts, which reconstruct() is invariant to), so reusing the reconstructor unchanged guarantees that a grid imported through FIPNEST equals the sidecar-based import. A successful sidecar reconstruction auto-exports <gridbase>_FIPNEST.grdecl next to the grid file, scripts/nested_hybrid_grid/ insert_fipnest_into_init.py inserts the arrays into an INIT file using resfo, and RimEclipseResultCase prefers the INIT-embedded arrays over the sidecars when both exist. Verified by unit tests covering the codec round-trip, array invariants, cellwise grid equality of the two import paths, the GRDECL writer, and a hermetic end-to-end pass that stages the model, appends the INTE arrays to the INIT copy and imports without sidecars.