Musculotendon Simulation for Hand Animation

How to read this

Category

Method: biomechanical musculotendon simulation for animation

Contributions

• Generates tendon and muscle motion under the skin of a traditionally animated character, integrating keyframe or mocap pipelines with a biomechanical simulator
• Models bones as rigid bodies and tendons and muscles as spline-based strands with sliding and surface routing constraints
• An incremental controller solving constrained quadratic optimization to find muscle activations that track the input skeletal animation, then skins the strand motion to the surface

Context

Builds on anatomical muscle simulation such as Creating and Simulating Skeletal Muscle from the Visible Human Data Set (Teran et al.), but uses strand-based musculotendons driven to track an artist's animation.Builds on: Creating and Simulating Skeletal Muscle from the Visible Human Data Set

Correctness

Demonstrated on a hand and forearm model with a stated count of musculotendons and bones, capturing tendon deformation on the back of the hand and thumb; readers should keep in mind it targets subcutaneous strand and tendon motion as a post-process layer, and results are shown on this anatomical region rather than as a general full-body solver.

Clarity

Moderately technical; a first pass conveys the track-an-animation idea, a second pass clarifies the strand constraints and activation optimization.

How to read it

Focus on the strand routing constraints and the activation-tracking optimization, since those are the core; a second pass pays off if you want anatomically plausible tendon motion in a rig.