Authors:
Tim Wu
;
Peter Hunter
and
Kumar Mithraratne
Affiliation:
The University of Auckland, New Zealand
Keyword(s):
Facial Animation, Anatomical Facial Geometry, Finite Deformation Elasticity, Muscle-driven Model.
Related
Ontology
Subjects/Areas/Topics:
Animation and Simulation
;
Computer Vision, Visualization and Computer Graphics
;
Facial Animation
;
Geometry and Modeling
;
Physics-Based Animation
;
Solid and Heterogeneous Modeling
Abstract:
A detailed high-order (cubic-Hermite) finite element model of the human head was constructed from anatomical data segmented from MR images. The model includes a superficial soft-tissue mesh (skin, subcutaneous layer and superficial musculo-aponeurotic system), 20 muscles of facial expressions and several deep structures. Based on the theory of finite deformation elasticity together with large deformation contact constraints, quasi-static facial expressions were generated by activating transversely isotropic muscles that were accurately depicted by their respective anatomical geometries. Material (muscle-fat) heterogeneity was also introduced to capture the realistic formation of skin folds. Using the described approach, four facial expressions were simulated and compared with the surface data obtained from a 3D structured-light scanner. Predicted expressions showed good agreement with the experimental data.