Alignment-Response-Computation

Biomechanical Analysis from Motion Capture

A 14-step computational pipeline that derives joint kinetics, muscle activation, fascial force transmission, and ground reaction force distribution from a single movement recording.

Every visualization is driven by Newtonian mechanics — nothing is keyframed by hand.

What the Pipeline Computes

The pipeline ingests standard motion capture data and computes segment-level physics across the full skeletal hierarchy. The output spans four analysis domains, each visualized as an independent interactive layer.

Skeletal Loading

Per-joint compression, shear, and torsion stress computed via inverse dynamics. Forces propagate through the skeletal chain from ground contact through the spine and out to the extremities. The result is a full-body stress map that updates every frame of the movement cycle.

Fascial Force Transmission

Twelve myofascial meridians — Superficial Front and Back, Deep Front and Back, Spiral, Lateral, Functional, and Arm lines — are evaluated for connective tissue stress. Each meridian is rendered as a transparent skinned mesh with per-frame color animation driven by the underlying joint kinetics.

Muscular Activation

Net forces at each joint are decomposed into gravitational, ground reaction, and muscular effort components. Over 200 individually modeled muscles are mapped to their corresponding joint actions and visualized by activation intensity across the movement.

Performance Metrics

Joint stress magnitude charts, kinetic chain sequencing (sequential joint activation timing from ground to endpoint), bilateral ground reaction force distribution, and endpoint performance metrics — speed, efficiency, and energy output — all computed from the same movement recording.

Computation & Rendering

Analysis

Automated anatomical segmentation from standard skeletal hierarchies

Inverse dynamics force computation across the full body

Bilateral ground reaction force estimation from center-of-mass kinematics

Muscle-level force decomposition at every joint

Connective tissue stress evaluation across twelve fascial chains

Batch processing pipeline for multi-file analysis

Visualization

Three.js WebGL rendering with custom GLSL fragment shaders

Skinned mesh animation with real-time material color interpolation

Custom heatmap shaders mapping scalar stress data to color gradients

Transparent layered rendering for simultaneous multi-system visualization

Animated bar charts, force vectors, and pressure maps — all driven by computed data

Interactive toggles to isolate individual analysis layers

All visualizations run at 60fps in-browser with no plugins or downloads

Applications

This pipeline was developed for human movement analysis but the underlying approach — deriving forces from observed motion, resolving them through a structural hierarchy, and rendering the results as interactive layered visualizations — applies to any domain where complex physical systems need to be communicated clearly. Structural load paths, fluid system dynamics, environmental force modeling, infrastructure behavior under load.

Research Papers in Progress

Multi-Source Force Decomposition in Human Movement Analysis

Target: Journal of Biomechanics

Markerless Ground Reaction Force Estimation from Motion Capture