Keywords: motion capture The introduction part of a three-dimensional animation character animator shows their differences by introducing the work content and dynamic completion technology respectively, and then compares and verifies the final result 1. The duties of an animator 1. 1. The definition of a three-dimensional character animator is to realize the animation effect through computer software, and the three-dimensional animator may not draw anything. You don't know color matching, you don't know composition, and you don't know anything about painting. The job of a 3-D animator is to connect the models bound by modeling into animation through the swinging motion of 24 frames per second, and to transform the text or shot content of the storyboard into the process of responding to the character model. Traditional animators (two-dimensional animators) used to draw one by one with paper and pen, proofread one by one, then shoot one by one with a special camera for cartoons, and finally synthesize animations. With the development of computer technology, most of them are drawn by computers now, and the work of 3D animators is much more than that of 2D animators. When a two-dimensional animator draws a picture, he only needs to draw the required frames in place. 3d animators should estimate the fluency and degree of action in the shot and the same shot. It's a great animation when it's done, and even some realistic animations occasionally look like performances by real actors. If you don't do it well, it will be easily seen by the audience, and it will look fake and awkward. People often discuss the use of software, such as which software to start animation (especially 3dsmax and maya). In fact, these are completely unnecessary for a three-dimensional character animator. As a 3D animator, even if you don't know how to use the software, as long as you know the principles of K-frame and animation, you can make an interesting animation demonstration, in which human mechanics is in place and its animation performance is very vivid. In this way, you can be competent as a 3D animator. Of course, to do this may require long-term training. The principle of learning to draw is the same. Besides long-term practice, we should also cultivate our sensitivity to movements and expressions. When the time comes, your animation will only rely on a kind of "feeling". 2. English motion capture, referred to as Mocap. This technology involves data that can be directly understood and processed by the computer in size measurement, object positioning and direction determination in physical space. Set a tracker in the key part of the moving object, capture the position of the tracker through the motion capture system, and then get the data of love you coordinates in three-dimensional space through computer processing. When the data is recognized by computer, it can be used in animation, gait analysis, biomechanics, ergonomics and other fields. We are talking about the use of animation, and other parts are no longer involved. At present, optical motion capture is widely used in animation field. Optical motion capture completes the task of motion capture by monitoring and tracking the specific spot on the target. At present, most common optical motion capture is based on the principle of computer vision. Theoretically, as long as a point in space can be seen by two cameras at the same time, the position of the point in space can be determined according to the images taken by two cameras at the same time and the camera parameters. When the camera continuously shoots at a high enough rate, the motion trajectory of this point can be obtained from the image sequence. A typical optical motion capture system usually uses 6~8 cameras, which are arranged around the performance venue, and the overlapping area of camera fields is the action range of the performer. In order to facilitate transportation, performers are usually required to put on monochrome clothes and put some special signs or luminous points on key parts of the body, such as joints, hips, elbows and wrists, which are called "marks". The vision system will recognize and process these signals. After the system is calibrated, the camera continuously shoots the performers' actions, and saves the image sequence, then analyzes and processes them, identifies the landmark points, calculates their spatial positions at each moment, and then obtains their motion trajectories. In order to get accurate motion trajectory, the camera should have a high shooting rate, generally reaching more than 60 frames per second. If the marker is attached to the key point of the performer's facial expression, the expression can be captured. At present, most expression capture is optical. The application of motion capture technology in animation can greatly improve the level of animation. It greatly improves the efficiency of animation production, reduces the cost, and makes the animation production process more intuitive and vivid. With the further maturity of technology, behavioral animation technology will be more and more widely used, and motion capture technology, as an indispensable and most critical part of behavioral animation system, will inevitably show a more important position. At present, 3D movies such as Avatar and Saving Mother from Mars all adopt this technology, which can capture simulated motion. Not only abroad, but also some domestic game manufacturers and some animation companies are using it, such as Qin Shimingyue Technology: In the past computer animation production, we all used 3D animation software to make 3D characters and modulate angle movements. The whole character action is adjusted by the operator frame by frame, so the production of the action becomes very complicated, error-prone and inefficient. Therefore, generally, the action time made by 3D animation software will not be very long, and some actions are poorly made. This phenomenon is not difficult to find in some film and television works. The animation system based on motion capture records the actual motion data of the object and inputs it into the computer. After processing, the computer restores and controls the material in the virtual shot. Because it records the actual motion of the object, it is accurate and efficient. Advantages: The advantage of optical motion capture is that the performer has a wide range of activities, is not limited by cables and mechanical equipment, and is convenient to use. The sampling rate is high, which can meet the needs of most motion measurement. Marker is cheap and easy to expand. Disadvantages: The system is expensive, although it can capture real-time motion, but the post-processing (including mark recognition, tracking and spatial coordinate calculation) takes a long time. This system is very sensitive to the illumination and reflection of the performance venue. Equipment calibration is also very complicated, especially in the case of complex motion. The marks in different parts are easy to be confused and obscured, which leads to wrong results, and manual intervention is often needed in the post-processing process. Due to various limitations, almost all optical tracking systems still need to rely on post-processing programs to analyze, process and sort out the captured data before they can be applied to animated character models. 3. Can motion capture technology replace manual K-frames? Some people may ask whether manual K-frames are troublesome and costly, and many animators need to be invited to participate in the production. Moreover, not just any animator can achieve realistic technology. It needs long-term training. Since it is so troublesome, why not use dynamic complement technology instead? Let me discuss it: 1. Animation captured by motion is slow. Without exaggeration, it can't express its actions gladly. Many people think that the action is naturally applauded, but it is actually wrong. A good animation is to infect the audience, not just to achieve the purpose of animation. 2. This thing has no aura, not vivid enough, dull, dull eyes and stiff expression. Some people may say that the technology of dynamic compensation is not enough to capture the actors' movements and demeanor on time. Of course, this is also one aspect, but the most important thing is the controllability of animation. Animation spirituality can be realized not only by simulating the behavior of real people. In traditional two-dimensional animation, animators often have some small moves to attract the attention of the audience. The audience likes the animations made by animators frame by frame, with many details of expressions and exaggerated and funny actions. The animation made by a good animator can't be realized by motion capture. 3. Motion capture is uncontrollable and needs certain conditions to be realized. The most important thing is to perform the captured characters or animals like real people, which may be simulated, but some difficult movements, such as handstands in the air and some difficult martial arts performances, are abnormal. In addition, when facing animals, there is nothing you can do. Animation will not listen to the director's arrangement, according to the director's actions to perform, so it has nothing to do with the replacement. There are also some abiotic sports, and these complementary technologies are nowhere to be inserted. 4. Motion capture is only suitable for real people whose characters are real people. This kind of realistic movie motion capture has better effect and higher efficiency than animators. Motion capture can greatly reduce the workload of animators, but it will not replace animators. Any action captured by any form of motion capture will eventually be repaired by the passive painter again. Besides, the equipment for catching animals is not cheap, and many domestic companies are still doing it by hand. 5. The technology of dynamic drawing compensation does save a lot of time for some animation links, but it is only a technology and can never replace the work of animators, just as photos can never replace painting.