360° Digital Twin Generation: From Camera Landmarks to a Personalised Avatar

Start with stable, visible landmarks

A reliable capture starts only after the head, shoulders, hips, and ankles are visible for several consecutive frames. Requiring every landmark to be perfect in a single frame can make the experience brittle; accepting one noisy frame can make it inaccurate. A better design combines visibility thresholds, a short stability window, and a clear repositioning message.

A T-pose detector should evaluate arm extension relative to shoulder width and body height, allow natural asymmetry, and use confidence values when the model provides them. Wrist and elbow positions should be checked against shoulder height without demanding mathematically exact horizontal lines.

Track the turn as a sequence

A 360-degree scan can infer orientation changes from shoulder and hip spans, landmark visibility, and the relative movement of the torso. Front, side, back, and opposite-side milestones should be latched only when observations remain stable. If the user moves too quickly or landmarks disappear, the scan should preserve its progress and wait for a confident view instead of jumping to completion.

• Keep the phone or laptop camera stationary.
• Turn slowly while keeping the full body in frame.
• Use multiple frames to confirm each orientation milestone.
• Stop the capture cleanly when the page unmounts or camera permission is revoked.

Estimate proportions carefully

A single RGB camera does not provide absolute body depth. The ratio between shoulder span and the visible head-to-ankle height can inform a relative width scale. Hip span can inform a relative depth scale, while user-entered height can calibrate overall avatar height when available. Samples should be collected from stable frames, filtered for outliers, and averaged or median-filtered before they are applied to the rig.

Scaling should be bounded to prevent an outlier from creating a distorted avatar. It should be applied in the model’s local coordinate system, with the feet re-aligned to the ground plane after scaling. These values personalise a visual silhouette; they are not exact anthropometric measurements.

Keep the renderer and rig consistent

The final avatar should use the same canonical rig and shader path as the marketing showcase. That avoids differences in bone structure, shader response, and ground alignment between the public demo and internal tools. A shared rendering component is preferable to copying shader snippets into multiple pages, because one correction can then be applied everywhere.

Communicate permissions and failure clearly

Camera access must be requested in response to a user-visible scan entry point and requires a secure browser context. Permission denial, unavailable devices, missing MediaPipe assets, and unsupported browsers should each produce an actionable message. Silent failure is especially confusing when the interface appears to be waiting for a pose that can never be detected.