- Start camera, then step back until your whole body is in the frame.
- Pick what to check — side-on for hinges and squats, face the camera for knee tracking.
- Pick a client and just lift. Reps count on their own: the readout on the video shows the move and the count. A set closes after a few seconds of rest, then you enter the weight.
- Doing a move the camera doesn't know? Hit ⏺ Teach a new move, demo it 5–10 times, name it. No time to set up? Teach, then load a clip with Video… — footage works the same as the live camera.
- On the OBSBOT, Camera follows you keeps your whole body in frame on its own. Strudel gets her own name tag.
- Enter sex, age, height and weight. Height sets the scale, so it matters most.
- Camera at chest height, 2.5–3 m away, plain background if you can. Tight clothing, hair up.
- Capture Front: feet hip-width, arms 20–30° out. Then Side: left side to the camera. Use the self-timer or upload photos.
- Analyse. Neck, waist and hip circumferences feed the US Navy method; height, weight and age feed the muscle-mass equation. Every figure shows which method made it.
- Start the local 3D engine (see the methods note) and the same photos become a full body mesh whose slices replace the silhouette widths.
| Level | cm | in | Source |
|---|
Silhouette: MediaPipe pose + person mask on each still. Height scales pixels to cm. Front gives widths, side gives depths; circumference = ellipse perimeter (Ramanujan). Without a side photo, depth is assumed from typical ratios and flagged.
Body fat: US Navy circumference method (Hodgdon & Beckett 1984; SEE ≈ 3.5–4 % vs hydrostatic). Cross-checks: CUN-BAE (Gómez-Ambrosi 2012) and Deurenberg 1991 from BMI.
Skeletal muscle: Lee et al. 2000 anthropometric equation, validated against whole-body MRI. FFMI: Kouri 1995 normalisation. Ratios: Ashwell WHtR 0.5; WHO WHR 0.90 / 0.85.
3D engine (optional): tools/bodycomp_server runs SAM 3D Body (Meta, 2025) on this machine, slices the fitted mesh at each level and returns true circumferences. Start it with .venv\Scripts\python tools\bodycomp_server\server.py. Known limit: the mesh smooths individual morphology (Aiersilan et al. 2026), so it is a better ruler, not a scanner.