human figure - overview

Rick Parent - CIS682

Human Figure - Overview

Reactionary MotionsClothesHair

TasksReaching & GraspingWalkingTalkingMotor Skills

Layered ConstructionBoneMuscleSkin

Other MotionsFacial ExpressionGesturesIdiosyncraticSecondary Motion

Intelligent behavior


Modeling the Human Form

Artistic AnatomyAnatomy related to surface appearanceversus Medical AnatomyWell-developed literature

Forensic ScienceFacial Reconstruction

Plastic SurgerySurface Appearance Reconstruction


Layered: Bone-Muscle-Skin

Bone

Muscle &Tendons

Skin

Fatty Tissue


Modeling - Layered

FFD muslces

John Chadwick, ABD


Modeling - Thalmann, EPFL

From http://ligwww.epfl.ch/

Implicit surfaces


Modeling

Embed polyhedra in implicit surfaceImplicits used for approx. collision detect & respondPolyhedra used for display

Use M.-P. Cani technique to distort implicits based on collisions

Karan Singh, PhD


Human Figure

Use artistic anatomy to design muscles

Ferdi Scheepers, PhD


Human Figure


Figures - Wilhelms, UCSB

http://www.cse.ucsc.edu/~wilhelms/fauna/Monkeys/5monk_parts.gif


Reaching & Grasping

Inverse Kinematics

What is ‘human-like’ motion?

Path planning

Holding and manipulating tools


Reaching

Shoulder: 3 DoF

Elbow: 1 DoF

Wrist: 3 DoF

Arm - 7 DoF Or 2 at elbow, 2 at wrist

Or 1 at elbow, 2 at wrist,add one at mid-forearm


Reaching - heuristic

Decide on ‘reasonable’ plane for arm based on task

Reduce problem to 2D arm position + hand configuration


Reaching

Joint limits are a function of joint position

Collision avoidance with body, other limbs

Strength a function of joint position


What’s ‘human-like’ ?

Depends on orientation and task

straight-line path

Minimize total torque

Minimize maximum velocity, acceleration, jerk

Maximize ‘comfort’


In obstacle-filled environment

Dave Miller PhD


Grasping

Standard methods of grasping

By handle

Two finger

Wrap around

Two hand


Walking

Hip: 3 DoF

Knee: 1 DoF

Ankle: 3 DoF

Toes: 1 ‘DoF’

but usually not independent (free)

Gravity

Maintain balance (static)Simplify dynamicsDecouplereduce DoFs


Walking


Walk Cycle


Run Cycle


Walking - Hip Angles v. Time


Walking - Jessica Hodgins, CMU


Facial Animation

Complex surface

Very familiar structure

Deformable surface

Very important - Principal means of communication

Facial expressions, lip-synch, prosodic facial animation


Facial Animation by Texture Maps

Ebert - from Getting Into Art


Facial Animation

http://mambo.ucsc.edu/psl/sig97/siggraph97-panel.html


Facial Action Units (FACs)

From Eckman and Friesen


Facial Animation


Fred Parke model


Digitizing Faces


Facial Modeling - Surface Springs


Facial Animation - Structural


Facial Animation


Terzopolous, NYU


Facial Animation

www.cis.ohio-state.edu/research/graphics/research/FacialAnimation/

Scott King, PhD


Behavior

Intelligent interaction with user

Engage in conversation w/gestures

Cooperation w/ other agents

AI, Spatial reasoning, human-like reaction


Behavior

Daniel Thalmann, LIG, EPFL


Cloth and Clothes

Texture maps

Full collision detection and response

draping

flowing


Simulate at what level?

Fold level - catenary curves between points of support

Weave level - warp and weft

Patch level - triangles or higher order patches

Thread level - property and structure of thread


Tight Fitting Clothes

Daniel Thalmann, EPFL


Cloth


Cloth Nadia Magnenat-Thalmann, MIRALab


Clothes

http://cs-people.bu.edu/jingbinw/Clothsim_Submit.PDF


Hair

Rigid object

Model each strand

Model by clumps

Rigid underlayment w/ strands over top

Texture map


Hair


Standards & Resources

MPEG-4 - Moving Pictures Expert Group http://mpeg.telecomitalialab.com/standards/mpeg-4/mpeg-4.htmhttp://ligwww.epfl.ch/mpeg4/

H-anim - human animation working group http://www.h-anim.org/

The Visible Human Projecthttp://plum.ia.polsl.gliwice.pl/~DIP/visible/visible_human.html


The Major Players

Nadia Thalmann - MIRALab research group at the University of Geneva http://www.miralab.unige.ch/MIRAhtml/mirahome.htm

Daniel Thalmann - The Computer Graphics Lab (LIG) at the Swiss Federal Institute of Technology (EPFL) in Lausanne: http://ligwww.epfl.ch/

Norm Badler - Center for Human Modeling and Simulation athe University of Pennsylvaniahttp://www.cis.upenn.edu/~hms/


The Major Players

Demitri Terzopolous - NYUmrl.nyu.edu/~dt/

Michiel van de Panne - Vancouver, B.C.www.dgp.utoronto.ca/people/van/van.html

Jane Wilhelms - UCSCwww.cse.ucsc.edu/~wilhelms/


The Major Players

Tom Calvert - Simon Fraserwww.cs.sfu.ca/people/Faculty/Calvert/index.html

Michael Cohen - MicroSoft Researchwww.research.microsoft.com/~cohen/

Marie-Paule Cani - iMAGISwww-imagis.imag.fr/Membres/Marie-Paule.Cani/index.gb.html


The Major Players

Jessica Hodgins - CMUwww.ri.cmu.edu/people/hodgins_jessica.htmlwww.cc.gatech.edu/gvu/animation/Areas/humanMotion/humanMotion.html

Michael Gleicher - Wisconsinwww.cs.wisc.edu/~gleicher/

human figure - overview

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