full-scrolls

Fiber orientation direction fields for the Vesuvius Challenge Herculaneum scrolls, organized to match the VC3D volpkg folder structure exactly.

What this is

Each tile contains predicted fiber orientation vectors (normal, vertical, horizontal components) for 256x256x256 voxel cubes of each scroll's CT volume. These are intended as inputs to VC3D's Surface Growth fiber-direction optimization slot, to help the segmentation pipeline trace individual papyrus sheet layers more accurately. These predictions were produced by a small 3D U-Net trained by Joseph Balmaceda on the Vesuvius Challenge fiber-skeletons dataset (31 manually annotated cubes from scrolls s1, s3, and s5). The trained model weights have not been uploaded here. The code used to train the model and generate these predictions showed these performance weights on held-out data: mean |cos(angle)| = 0.807 (1.0 = perfect, 0.5 = random). This is a baseline/proof-of-concept, not a production model.

Scroll status

• Scroll 1 (PHercParis4): scaffold only -- already read in full by the community team (2023 Grand Prize). No predictions included.
• Scroll 2 (PHercParis3): predictions in progress. Unread. Active prize target.
• Scroll 3 (PHerc332): predictions in progress. Unread. Active prize target.
• Scroll 4 (PHerc1667): predictions in progress.
• Scroll 5 (PHerc172): predictions in progress. Note: precomputed fiber direction fields already exist at dl.ash2txt.org for parts of Scroll 5.

Structure

full_scrolls/
  Scroll1/PHercParis4.volpkg/   (scaffold only)
  Scroll2/PHercParis3.volpkg/
  Scroll3/PHerc332.volpkg/
  Scroll4/PHerc1667.volpkg/
  Scroll5/PHerc172.volpkg/
new_segments/
  run_vc.sh
  docker_commands.txt

Each volpkg:

• config.json -- VC3D required
• volumes/{volume_id}/meta.json -- VC3D required
• representations/direction_fields/fiber-directions.zarr/ -- predictions
• paths/, renders/, working/, normal_grids/ -- VC3D working dirs

Tile format

Each tile folder (z{z}_y{y}_x{x}/) contains:

• horizontal/ -- dx component zarr array (float32, up to 256^3)
• vertical/ -- dy component zarr array
• normal/ -- dz component zarr array
• meta.json -- absolute scroll coordinates, voxelsize, scroll info

VC3D usage

Load the volpkg in VC3D and point Surface Growth > Zarr folder at: representations/direction_fields/fiber-directions.zarr/horizontal

If you're gonna steal my work atleast pay me if you get a prize