Jake-vc/first-light-pherc0175a

First Light: PHerc0175A

Surfaces, ink maps and screening results from a documented First Letters attempt on PHerc0175A (public ESRF scan 20250521115057-8.640um-1.2m-116keV-masked, 8.64 µm). The write-up, verdicts, readout rules and every script are in the GitHub repository jake-vc/first-light-pherc0175a.

In short: two tall windows of the scroll were fitted with villa main's spiral fitter, every winding was snapped to the papyrus and flattened. Window P was rendered and screened with three ink models; no ink was found, and the analysis explains why PHerc. 343's ink thresholds do not transfer to this scroll. Window W2 is fitted and flattened, ready to render, and was not screened.

Start here

If you want to...	Use
Render a winding yourself	window_*/meshes/flattened/<winding>/ (tifxyz: x.tif, y.tif, z.tif, meta.json) with VC3D vc_render_tifxyz against the public volume above
Know how well a winding sits on the papyrus	window_*/meshes/placement_snapped.tsv: frac_with_sheet = share within ±2 voxels of the predicted sheet
Redo the ink analysis without a GPU	window_P/ink_maps/<winding>/: three models' maps at the surface, both sides
See what was judged	window_P/judged_windings/<winding>/yellow_small.png (reading side) and yellow_blind_small.png (control side)
Continue or re-export a fit	window_*/fit/checkpoint/step_10000.ckpt with villa main's spiral-fitting (commit in fit/villa_commit.txt)

Windings are named w<NNN>_main (spiral turn number, inner to outer); the same number in both windows is the same turn.

Layout

window_P/            slices 4,800-7,800, windings 10-129; screened (117 windings with >= 70% on the papyrus)
  fit/               fit log, loss/placement curve, settings, villa commit, final checkpoint, export and check logs
  meshes/
    exported/        meshes as exported by the fit
    snapped/         snapped onto the predicted papyrus sheet
    flattened/       snapped and flattened: the surfaces that were rendered and screened
    placement_exported.tsv, placement_snapped.tsv   share of each winding on the sheet, before and after snapping
  screen/            per winding: flag statistics (stats.json), contact sheet (sheet.png), render crop; summary.jsonl
  ink_maps/          reader-v2, dense_native, reader-v3 at depth 0; *_reverse.tif = reading side, others = blind side
  judged_windings/   the ten windings judged by eye: six-model whole-winding views (reading and blind side) and maps
window_W2/           slices 7,600-10,600 (200-slice overlap with P), windings 10-129; fitted and flattened only
  fit/, meshes/      as above (113 windings with >= 70% on the papyrus)
analysis/
  gate_ranking/              flag ranking and per-winding background statistics
  rescreen_self_calibrated/  re-screen with thresholds set from the blind side; 343 control check
  speed_benchmark/           screen timings and map comparisons
control_343/         PHerc. 343 positive control: maps and calibration
pipeline_logs/       job logs and state markers as run
MANIFEST.tsv         sha256 of every file

Not included, because they can be re-created from public data: the CT, the community lasagna inputs (SharpMeow), and the 66-layer renders.

Licence and credits

CC BY-NC 4.0, as the data it derives from: the PHerc0175A scan and models (Vesuvius Challenge), the community lasagna fields and center line (SharpMeow). Ink models: reader-v2/v3 (DomRusso2), dense_native, ink_9um and Hecate (Vesuvius Challenge and the PHerc. 343 winning team). Built with an AI coding agent (Claude Opus 5.5, Claude Code).