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Motion Capture Laboratory. School of Arts and Humanities Erik Jonsson School of Engineering and Computer Science University of Texas at Dallas. What is Mocap?. Motion capture (mocap) is sampling and recording motion of humans, animals, and inanimate objects as 3D data.

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motion capture laboratory

Motion Capture Laboratory

School of Arts and Humanities

Erik Jonsson School of Engineering and Computer Science

University of Texas at Dallas

what is mocap
What is Mocap?
  • Motion capture (mocap) is sampling and recording motion of humans, animals, and inanimate objects as 3D data.
  • The data can be used to study motion or to give an illusion of life to 3D computer models.
applications
Applications
  • Entertainment
  • Medicine
  • Arts / Education
  • Science / Engineering
entertainment live action films
Entertainment: Live Action Films
  • Computer generated characters in live action films.
entertainment 3d computer animations
Entertainment: 3D computer animations
  • Characters in computer animated files (e.g. Avatar, Polar Express, Monster House)
entertainment video games
Entertainment: Video Games
  • Video games by Electronic Arts, Gremlin, id, RARE, Square, Konami, Namco, and others, (e.g. Enemy Territory)
medicine
Medicine
  • Medicine (e.g., gait analysis, rehabilitation)
  • Sports medicine (e.g. injury prevention,performance analyses, performance enhancement)

Gait Analysis Service

arts education
Arts / Education
  • Dance and theatrical performances
  • Archiving (e.g., Marcel Marceau)

OSU/ACCAD

science engineering
Science / Engineering
  • Computer Science (e.g., human motion database, indexing, recognitions)
  • Engineering (e.g., Biped robot developments)
  • Ergonomic product design
  • Military (e.g., field exercises, virtual instructors, and role-playing games)
mocap animation
Mocap animation
  • Motion capture animation is different from keyframe animation in terms of how motion is created.
  • Same principles apply to mocap animation & keyframe animation!
  • A combination of motion capture animation and keyframe animation is often used.
keyframe animation
Keyframe animation
  • A keyframe is a drawing of a key moment in an animated sequence, where the motion is at its extreme.
  • Inbetweens fill the gaps between keyframes.
  • Every motion is created by animators.
advantages of mocap animation
Advantages of mocap animation
  • Faster to create (only if an established production pipeline exists.)
  • Secondary motions and all the subtle motions are captured -> more realism.
  • Physical interactions between performers and props can be captured.
disadvantages of mocap animation
Disadvantages of mocap animation
  • Cost.
  • Manipulating mocap data is often difficult -> Re-capturing or key framing a shot with bad data is often easier.
  • Mapping mocap data of a performer to a character with a different proportion often causes problems.
types of mocap equipment
Types of mocap equipment
  • Magnetic systems
  • Mechanical systems
  • Optical systems
magnetic systems
Magnetic systems
  • Utilize sensors placed on the body to measure the magnetic field generated by a transmitter source.
magnetic systems16
Magnetic systems
  •  Require no special lighting condition.
  •  Sensors are never occluded.
  • X Require a metal-fee environment.
mechanical systems
Mechanical systems
  • Exoskeleton with angle sensors.
mechanical systems18
Mechanical systems
  •  Measure joint angles (no marker ID problems).
  •  Sensors are never occluded.
  • X Breakable!
  • X Configuration of sensors is fixed.
  • X Constrains on joints.
optical systems
Optical systems
  • The cameras are equipped with infrared LED's and filters. (Filters enhance the contrast of the image.)
  • The cameras see reflector markers.
optical systems20
Optical systems
  •  Higher sampling rate.
  •  Larger capture space.
  • X Markers are sometimes occluded -> marker ID problems.
  • X Provide only positional data -> joint angles need to be computed.
mocap system at utd
Mocap system at UTD
  • Vicon optical system - Best system in Academia!
  • 8 high-speed MX 13 (up to 1000 fps) and 8 high-resolution MX 40 (4 million pixels) cameras.
  • Capture up to 5 performers at once.
mocap system at utd22
Mocap system at UTD
  • Vicon optical system - Best system in Academia!
  • 8 high-speed MX 13 (up to 1000 fps) and 8 high-resolution MX 40 (4 million pixels) cameras.
  • Capture up to 5 performers at once.
production pipeline overview
Production pipeline overview
  • Calibrate the system.
  • Fit a generic skeleton to the subject’s proportion (subject calibration).
  • Capture shots & reconstruct 3D trajectories using the calibrated subject.
  • Link the subject specific skeleton to a CG character’s skeleton and edit motion (in MotionBuilder).
  • Add skin to the CG character, edit motion, and render (in Maya).Pipeline flow chart & Detailed pipeline