Today we got given the chance to take a look at the motion capture suite in the Universities' Sports and Science's department. It was really exciting to actually see a motion capture suite and get a further insight into what it can do. Although we were shown the equipment and the uses that the department has it for, I saw the potential it had for 3D animation in our course. With 3D animation being my specialism, I took great interest in seeing how this fantastic tool is used. Motion capture suites can be used to capture data for the military, medical and sports as well as the entertainment industries.
Case Study: Andy Serkis ...
Serkis makes his living through acting with motion cap. Although best known for his portrayal of Gollum in Peter Jackson's "The Lord of the Rings" trilogy and Kong in Jackson's remake of King Kong, he has done the motion capture for chimpanzee Caesar in Rupert Wyatt's "Rise of the Planet of the Apes" and Captain Haddock in Steven Spielberg's "The Adventures of TinTin" films.
How Motion Capture Works ...
An actor is suited up in clothing with tiny polystyrene balls attached to all the major points of the body. These contain reflective markers which are captured by infra-red cameras. The cameras are set up in a large circle around the actor(s) which record the movements. The more markers that are used, the more data is captured although this depends on what the data will be used for, and how much money the studio can use for the motion capture data.
An example of the motion capture suits ...
Even props can be used but these will have to be composited in with the animation later ...
An example of a motion capture studio ...
Advantages ...
- Close to real life results can be obtained from motion capture data which significantly reduces the cost and money spent on animators' although this is bad as it replaces peoples' jobs in the industry
- Once all the equipment is set up, many takes of the same performance can be done until the director is happy with the data captured
- The amount of data captured and the time saved in key framing the same animation contributes towards making production deadlines easier
and Disadvantages ...
- The specific hardware and specialist software is extremely expensive
- Setting up the equipment so there is no chance of magnetic interference and reducing the chances of the tiniest of mistakes takes a very long time
- Most of today's motion capture equipment will only allow the data to be recorded and then watched by the crew (then decided whether to re-shoot it or not) which extends time recording data before it is pushed along the production pipeline. Only a few systems allow real time viewing alongside recording the data. It is easier to re-shoot rather than manipulate the data for animation later.
- Motion capture can only be used for realistic animation, which is perfect for live action and video games but for film and games that require more exaggerated and stylised animation, it is not so useful e.g. emphasises on anticipation, follow through, secondary action and even manipulating the shape of the character through squash and stretch must be added later
- Mesh intersections will occur if the computer model have different proportions from the motion capture actor e.g. if the model has exaggerated hands in size, when it comes to viewing the model that's been combined with the motion capture data the hands will intersect other parts of the bodies' mesh