Motion Capture & Animation
Research
By
Faye Mclellan
Motion capture.
Motion capture is the process of
recording a live motion event and
translating it into actionable data
tha...
Motion capture history… Rotoscoping.
• For either broadcast video or Internet
streaming video, rotoscoping is the rotated
...
Motion capture pipeline.
• The motion capture pipeline consists of planning,
shooting, data processing, skeleton creation,...
Feature Films
• Motion capture has been used extensively in feature films in
the last ten years. Some examples of its use ...
Motion Retargeting
• An important subject in animation that has developed over
the last 10 years is that of motion retarge...
Sequencing & Scripting
• State machines and scripting languages are popular
methods for controlling the behaviors of chara...
Artificial Intelligence
• AI is used more and more for complex
animation control
• It is often used to control large numbe...
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Presentation1

  1. 1. Motion Capture & Animation Research By Faye Mclellan
  2. 2. Motion capture. Motion capture is the process of recording a live motion event and translating it into actionable data that allows for a 3d recreation of the performance. In other words, transforming a live performance into a digital performance. In motion capture sessions, movements of one or more actors are sampled many times per second. Whereas early techniques used images from multiple cameras to calculate 3D positions, often the purpose of motion capture is to record only the movements of the actor, not his or her visual appearance. This animation data is mapped to a 3D model so that the model performs the same actions as the actor.
  3. 3. Motion capture history… Rotoscoping. • For either broadcast video or Internet streaming video, rotoscoping is the rotated projection of a sequence of usually photographed action image frames so that the artist can trace from the frame or create an image to superimpose on it. It can be thought of as "painting on movies" efficiently. Prior to computers, an animation stand called a Rotoscope was used to project a sequence of action frames against a surface so that a set of animation frames could be traced or created. The same work can now be done with digital images and special computer software. Tools that provide efficient ways to rotoscope include Digital Magic and Elastic Reality. Rotoscoping is frequently used as a technique for combining (compositing) cartoon figures with realistic settings in television commercials and is also used for special effects in feature-length films.
  4. 4. Motion capture pipeline. • The motion capture pipeline consists of planning, shooting, data processing, skeleton creation, and mapping to characters. The most important point about using motion capture is to avoid problems by planning well ahead. • After the shoot, data processing consists of reconstructing the data from the different camera views to produce 3D positional data and labeling the markers. Once this has been done any noise in the data needs to be filtered and gaps in the data due to occlusion of markers needs to be filled.
  5. 5. Feature Films • Motion capture has been used extensively in feature films in the last ten years. Some examples of its use include for digital extras in the Titanic, digital stunts in Batman and Robin, facial capture in the Real Adventures of Johnny Quest, lead actor/fight scenes in The Mummy and The Mummy Returns and finally for multiple lead characters in Final Fantasy. Large fight scenes in LOTR as well as the Gollum character from the Twin Towers.
  6. 6. Motion Retargeting • An important subject in animation that has developed over the last 10 years is that of motion retargeting • The idea is to take an animation clip designed for one particular character and adapt it to play on a different character • Characters may differ: – Proportionally (same skeleton layout but with different offsets) – Topologically (different skeleton topology and different offsets) • This is a difficult subject because there isn’t always a ‘correct’ solution, and so heuristics must be used.
  7. 7. Sequencing & Scripting • State machines and scripting languages are popular methods for controlling the behaviors of characters over longer periods of time • Some modern state machine approaches can take a bunch of uncorrelated motion captured clips and automatically construct an appropriate state machine • For example, one can motion capture a bunch of generic moves: walk, run, turn, walk & turn, climb steps, walk backward, hop up, hop down… • The system then determines which moves could connect up based on various metrics • The actual motion can then be refined with sophisticated warping & blending schemes
  8. 8. Artificial Intelligence • AI is used more and more for complex animation control • It is often used to control large numbers of background characters • Obviously, there are numerous AI techniques, and it is an entire subject itself

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