Avatars and Simulation

• FIELDS OF STUDY: Digital Media; Graphic Design

ABSTRACT

Avatars and simulation are elements of virtual reality (VR), which attempts to create immersive worlds for computer users. Simulation is the method by which the real world is imitated or approximated by the images and sounds of a computer. An avatar is the personal manifestation of a particular person. Simulation and VR are used for many applications, from entertainment to business.

Virtual Worlds

Computer simulation and virtual reality (VR) have existed since the early 1960s. While simulation has been used in manufacturing since the 1980s, avatars and virtual worlds have yet to be widely embraced outside gaming and entertainment. VR uses computerized sounds, images, and even vibrations to model some or all of the sensory input that humans constantly receive from their surroundings every day. Users can define the rules of how a VR world works in ways that are not possible in everyday life. In the real world, people cannot fly, drink fire, or punch through walls. In VR, however, all of these things are possible, because the rules are defined by human coders, and they can be changed or even deleted. This is why users' avatars can appear in these virtual worlds as almost anything one can imagine—a loaf of bread, a sports car, or a penguin, for example. Many users of virtual worlds are drawn to them because of this type of freedom.

Because a VR simulation does not occur in physical space, people can "meet" regardless of how far apart they are located in the real world. Thus, in a company that uses a simulated world for conducting its meetings, staff from Hong Kong and New York can both occupy the same VR room via their avatars. Such virtual meeting spaces allow users to convey nonverbal cues as well as speech. This allows for a greater degree of authenticity than in telephone conferencing.

Mechanics of Animation

The animation of avatars in computer simulations often requires more computing power than a single workstation can provide. Studios that produce animated films use render farms to create the smooth and sophisticated effects audiences expect.

Before the rendering stage, a great deal of effort goes into designing how an animated character or avatar will look, how it will move, and how its textures will behave during that movement. For example, a fur-covered avatar that moves swiftly outdoors in the wind should have a furry or hairy texture, with fibers that appear to blow in the wind. All of this must be designed and coordinated by computer animators. Typically, one of the first steps is keyframing, in which animators decide what the starting and ending positions and appearance of the animated object will be. Then, they design the movements between the beginning and end by assigning animation variables (avars) to different points on the object. This stage is called "in-betweening," or "tweening." Once avars are assigned, a computer algorithm can automatically change the avar values in coordination with one another. Alternatively, an animator can change "in-between" graphics by hand. When the program is run, the visual representation of the changing avars will appear as an animation.

In general, the more avars specified, the more detailed and realistic that animation will be in its movements. In an animated film, the main characters often have hundreds of avars associated with them. For instance, the 1995 film Toy Story used 712 avars for the cowboy Woody. This ensures that the characters' actions are lifelike, since the audience will focus attention on them most of the time. Coding standards for normal expressions and motions have been developed based on muscle movements. The MPEG-4 international standard includes eighty-six face parameters and 196 body parameters for animating human and humanoid movements. These parameters are encoded into an animation file and can affect the bit rate (data encoded per second) or size of the file.

Educational Applications

Simulation and VR have long been valuable methods of training in various occupations. Pilots are trained in flight simulators and driving simulators prepare for licensing exams. VR classrooms, medical training simulations, and business scenario models allow professionals to engage in training, immersive learning experiences, or professional interactions from anywhere in the world. Sign language avatars, real-time translation, and adaptive simulations tailored to individual learning needs can enhance the accessibility of myriad digital applications or provide alternative learning methods for individuals with disabilities.

VR in 3-D

The integration of virtual reality into three-dimensional (3-D) simulations revolutionized fields such as architecture, engineering, and medicine. VR headsets, such as the Oculus Quest, HTC Vive, and PlayStation VR, provide users with immersive, first-person experiences controlled by full-body avatars. Many 3-D headsets are avaliable for entertainment and gaming, but similar technology is also utilized in a variety of professional and scientific settings. In training scenarios, VR simulations replicate real-world environments, allowing professionals to practice procedures in a risk-free setting. For instance, surgeons use VR to simulate operations, pilots train in flight simulators, and industrial workers rehearse complex procedures in virtual workspaces. The continual refinement of haptic feedback, eye-tracking, and neural interface technologies further enhances the realism of 3-D VR experiences.

Ariticial intelligence (AI), blockchain computing, and cloud computing provided further advancements in avatars and simulation technology in the twenty-first century. AI-powered avatars provide ultra-realistic digital humans capable of deep learning-based interactions. Blockchain technology enables decentralized avatar identities through non-fungible tokens, granting users ownership over their digital representations in the metaverse. Meanwhile, cloud-based simulation services allow users to access complex environments without requiring high-end hardware.

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