idirectships/splat-preh-001

Prehnite Specimen (preh-001) — Gaussian Splat

Prehnite specimen with extensive reconstruction history — 14+ training iterations spanning multiple capture sessions, background removal approaches, and cleanup chains. The final selected PLY is reruns/v14/FINAL/cleaned.ply (v10-cleaned-aggressive, 14,707 Gaussians).

Specimen Details

• Mineral: Prehnite (green crystal)
• Listed on: Borussia Minerals

Capture Sessions

Multiple capture and image-processing variants were used across the reconstruction history:

• v1–v3: Original iPhone captures (images_jpg/, images_nobg/)
• v4–v5: Additional capture sessions (images_v4_jpg/, images_v5_jpg/)
• v7: Additional session (images_v7_jpg/)
• v8: Further refined session (reruns/v1-original/images_v8_raw_jpg/)
• vid-v1, vid-v2: Video-source captures (240 blur-filtered frames, per-axis and combined)

Directory Structure

Primary (splat-data/)

images_jpg/          — original JPG captures (~69 frames)
images_nobg/         — background-removed images
images_raw/          — original RAW captures
images_v2_nobg/      — v2 background-removed
images_v4_jpg/, images_v5_jpg/, images_v7_jpg/  — additional capture sessions
colmap_ws/           — COLMAP workspace (sparse_best symlinked)
colmap_masks_v6/, colmap_masks_v7/  — mask variants
runs/
  v1-macbook-7k/output.ply    — 7k MacBook run
  v2-macbook-nobg-15k/output.ply  — 15k no-background run
  v3-macbook-15k/output.ply   — 15k standard run
  v5-preview-2k/              — 2k preview PLYs (output.ply + checkpoints at 500/1000/1500/2000 iters)
  v6-masked-2k/output.ply     — 2k masked run
  v6-masked-7k-crashed/       — 7k masked run (crashed)
  prior-attempts/             — early PLYs: Scaniverse exports, green-crystal variants

Reruns (splat-projects/)

reruns/
  v1-original/        — images_v8_raw_jpg/ + v8c-output.ply + v9/v10/v11 image variants
  v8/
    runs/2026-04-16-2000-MamaBerr/output.ply
  v10/
    runs/
      2026-04-17-2000-MamaBerr/output.ply
      2026-04-25-refine-v1-MacBook/  — cleaned variants (cleaned.ply, cleaned-aggressive.ply, etc.)
  v12/
    runs/2026-04-17-2200-MamaBerr/output.ply
  v14/
    FINAL/
      cleaned.ply      — SELECTED FINAL (v10-cleaned-aggressive, 14,707 Gaussians)
      cleaned.html     — SuperSplat viewer (self-contained)
    runs/
      v14a-mama-15k/   — PLY + cleaned variants
      v14b-mama-15k-masked/  — masked training PLY + cleaned
      v14c-mama-8k-masked/   — 8k masked PLY + cleaned
      v10-cleaned-aggressive/cleaned.ply  — source of FINAL
      v14a-cleaned-v2/cleaned.ply
  v14b/               — v14b standalone: v14b-15k-masked.ply, v14b-8k-masked.ply
  vid-v1/
    runs/per_video/   — per-video COLMAP + opensplat runs
  vid-v2/
    runs/
      combined/2026-04-22-7000-Drus-MacBook-Pro/output.ply
      per_axis/2791/2026-04-22-7000-Drus-MacBook-Pro/output.ply

PLY Summary (selected key runs)

Location	Iterations	Notes
runs/v1-macbook-7k/output.ply	7,000	Early run
runs/v2-macbook-nobg-15k/output.ply	15,000	No-background input
runs/v3-macbook-15k/output.ply	15,000	Standard
runs/v5-preview-2k/*.ply	2,000	Preview checkpoints
runs/v6-masked-2k/output.ply	2,000	Masked input
reruns/v8/runs/.../output.ply	2,000	Mama run
reruns/v10/runs/.../output.ply	2,000	Mama run + cleaned variants
reruns/v12/runs/.../output.ply	2,200	Mama run
reruns/v14/runs/v14a-mama-15k/output.ply	15,000	Mama masked run
reruns/v14/FINAL/cleaned.ply	—	SELECTED FINAL — v10-cleaned-aggressive, 14,707 Gaussians, NaN 0%, f_dc max 3.36

Final Reconstruction Details

• Selected: reruns/v14/FINAL/cleaned.ply (v10-cleaned-aggressive)
• Gaussians: 14,707 (most aggressive cleanup — lowest f_dc max of all candidates)
• Director selection: Visual A/B test, 4-panel comparison vs v14a/v14b/v14c
• Cleanup chain: splat-transform v1.10.2 — filter-nan + filter-harmonics + tight scale + low f_dc cap
• COLMAP source: Multi-source video → 240 blur-filtered frames → per-session COLMAP (31/40 registered)

Training Pipeline

1. Capture: iPhone video (vid-v1, vid-v2 sessions) + direct photo sessions
2. Frame extraction: Blur filtering, per-axis splitting
3. Structure from Motion: COLMAP (multiple workspace variants)
4. Gaussian Splat training: opensplat (Mac Mini M4 "Mama" + MacBook Pro)
5. Cleanup: splat-transform chain — NaN filter, harmonics filter, scale clamp, f_dc cap
6. Viewer: SuperSplat (self-hosted HTML viewer at FINAL/cleaned.html)

Viewing PLY Files

Use SuperSplat to view .ply Gaussian Splat files in-browser. The FINAL/cleaned.html file is a self-contained viewer that can be opened directly in any browser.