1. Modeling the Human Spine Benjamin Arai & Conley Read {barai, cread}@cs.ucr.edu CS 231, Dr. Victor Zordan CS&E UC Riverside

2. Overview Motivation Progress Goals –Modeling –Constraints –Control Video Breaks References

3. Motivation The Spine –The backbone of the human body –Highly flexible segmented structure –Overlooked in contemporary animation Proposal –Introduce anatomically correct constraints –Adapt High-level control of spine animation –Kinematics, Anatomical data, Empirical MoCap

4. Progress The spine determines vital Posture Research to create –Accurate Spine Model –Single Spine Shape Solver Leverage –Anatomy Texts –Biology Visualization –Modeling in Maya

5. Goals: Modeling Poses –Use of motion capture data for comparision –Simulation of natural poses from anatomical data Animation –We satisfy constraints at each time-step during simulation –Experimentally defined metrics limit the spine to anatomical flexibility Model –Highly detailed, anatomically correct models

6. Goals: Constraints Metrics –Empirically defined constraints Actual anatomy defines model limits Motion capture defines initial and final pose New metrics: discomfort, curvature, flexibility, and support… HL Control –Increases model expressiveness –Lowers animator control burden

7. Goals: Control Low-level –Point mapping Used to define new poses Motion capture data (researching) High-level –System Spine rooted at the hips Terminal cervical region as end-effecter –Sliders Position the end-effecter in the coronal, sagittal, and axial dimensions. Set these controls in each of the lumbar, thoracic, and cervical regions.

8. Important References M. Neff and E. Fiume. Methods for Exploring Expressive Stance. SIGGRAPH 2004. J. Wilhelms and A. Van Gelder. Anatomically Based Modeling. SIGGRAPH 1997. F. Scheepers, et al. Anatomy-Based Modeling of the Human Musculature. SIGGRAPH 1997. K. Growchow, S. Martin, A. Hertzmann and Z. Popovic. Style Based Inverse Kinematics. SIGGRAPH 2004. V. Ng-Thow-Hing and W. Shao. Modular Components for Detailed Kinematic Modeling of Joints. International Society of Biomechanics 2002. Humanoid Animation Working Group, http://www.hanim.org. http://www.hanim.org

9. Questions ?