Omar SobhandClaude Fable 5
4aec4e589d
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The march gains RTX_FSI{2,3}_FFLD (MarchConfig::ffld_dir, off by
default): every snap_every committed steps (10 when SNAPEVERY is 0),
dump the committed FlowField (FlowField::save, bit-exact), the solver's
own fluid-cell mask and the interface polygon as text sidecars, plus an
index.csv. Reporting-only after acceptance; the FSI2 default with the
knob off reproduces every printed digit of the warm-start baseline
(uy 3.4921 +- 3.5109, conservation 8.25e-12).
The exporter (rtx-cfd examples/ffld_to_vtk): a dump directory ->
clawview-readable legacy VTK — per-snapshot 2D triangle meshes (one
selectable point scalar --field p|umag|vort, the 0/1 fluid mask as
integer CELL_DATA) and an optional space-time volume (--spacetime:
frames stacked along z = time, prisms split to tets, POINT_DATA phi),
which clawview's slice-plane animation plays as a transient movie.
Verified end to end with REAL fields, not synthetic: a 29-frame FSI3
release-transient dump (t 4.0 -> 4.1, 64 MB) exported to 29 snapshots
+ a 984,312-tet space-time volume; the clawview server loaded both
(176,320 nodes volume; 23,877-node snapshots) and served live
cross-sections (time slices), vorticity isosurfaces and contours from
them. The check caught two real viewer-contract constraints now
encoded in the exporter: clawview's legacy-VTK path parses CELL_DATA
scalars as INTEGER markers only, and supports exactly ONE point scalar
(all POINT_DATA blocks append into `phi`) — multi-field snapshots need
the .clwv route, out of scope here.
Closes the top open thread of the fifteenth-session handoff (the
FSNP/FlowField->viewer exporter); the mesh-repo push and the claw-gds
cargo feature remain clawview-side items.
Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01X2GmJXeQ2njUecEKiJZ1G2