# GFM4DBench data package

TapVid3D / WorldTrack mini and SynthVerse benchmark data used by GFM4DBench.

## Layout

```text
4dbenchmark_data/
├── Tapvid3d_mini/
│   └── Tapvid3d_mini_extracted/
│       ├── adt_mini.json
│       ├── pstudio_mini.json
│       ├── po_mini.json
│       ├── ds_mini.json
│       ├── adt_mini/
│       ├── pstudio_mini/
│       ├── po_mini/
│       └── ds_mini/
└── SynthVerse/
    ├── synthverse_mini.json
    └── converted/
        ├── converted_subset50_64f_dynamic/   # trajectory arrays
        │   └── <sequence>/{trajs_3d,visibs}
        └── <sequence>/rgbs/
```

Each TapVid3D subset has 50 sequences. Every sequence contains the RGB frames
and the per-frame 3D trajectories and visibility flags.

SynthVerse has 49 sequences of 64 frames and uses the PointOdyssey coordinate
convention. It is reported separately from the TapVid3D average.

## Usage

Point `GFM4D_DATA_ROOT` at this directory (the one containing
`Tapvid3d_mini/` and `SynthVerse/`) and run the GFM4DBench evaluator:

```bash
export GFM4D_DATA_ROOT=/path/to/4dbenchmark_data
bash bench/GFM4DBench/script/eval.sh dynamic-points --subset pstudio --limit-seqs 1
bash bench/GFM4DBench/script/eval.sh dynamic-points --subset synthverse
```

The registry shipped with GFM4DBench (`bench/GFM4DBench/configs/subsets.yaml`)
already uses the nested paths above.

## Expected query counts

With the default clip length of 64 frames:

| Subset | Sequences | Frames per sequence | Scored queries |
|---|---|---|---|
| `adt` | 50 | 300 | 22187 |
| `pstudio` | 50 | 150 | 8720 |
| `po` | 50 | 128 | 53465 |
| `ds` | 50 | 128 | 45149 |
| `synthverse` | 49 | 64 | 15762 |

`total_queries` in `summary.json` must match these values.

## Contents and exclusions

Included: `rgb`, `trajs_3d` and `visibs`; intrinsics and extrinsics are stored
directly in the JSON.

Excluded: `depth/`, `trajs_2d/`, `valids/`, `query_track_indices/`, `*.bak`
duplicates and the `adt_mini_trajs2d_fixed/` copy. The evaluator never reads
them. The JSON files have been cleaned so that no path points to a missing
file, and the SynthVerse RGB files are stored as regular files rather than
symlinks.

## Integrity

```bash
sha256sum -c SHA256SUMS
```

`MANIFEST.json` records the subset statistics and the layout version.