Modeling the Human Spine

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Modeling the Human Spine

• Benjamin Arai Conley Readbarai,
  cread_at_cs.ucr.edu
• CS 231, Dr. Victor Zordan
• CSE UC Riverside

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Overview

• Motivation
• Progress
• Goals
• Modeling
• Constraints
• Control
• Video Breaks
• References

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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

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Progress

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

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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

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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

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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.

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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.

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Questions ?