Unit-6�Computer Simulation, Animation and Virtual Reality

PREPARED BY: SUSHANT BHATTARAI

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Animation

• Computer animation refers to the creation of animated images and videos using computer software.
• It is the process of generating moving images with the help of computer graphics.
• Computer animation can be used for a wide variety of applications, including movies, television shows, video games, and advertisements. Computer animation has revolutionized the entertainment industry and has become an essential part of many movies, TV shows, and video games.
• It has also been used for educational and training purposes, as well as in scientific and medical visualization. The development of computer animation has also led to the creation of new industries, such as visual effects and computer graphics.

Traditional Animation Techniques

• Traditional animation, also known as cel animation or hand-drawn animation, refers to the process of creating an animated sequence frame by frame using traditional, non-digital methods. Here are some of the most common traditional animation techniques:
• Flipbook animation: This is one of the simplest forms of animation, where a series of drawings are made on individual sheets of paper or sticky notes and then quickly flipped to create the illusion of motion. The drawings are typically very simple and can be done by hand, making flipbook animation a popular technique for beginners.
• 2D animation: 2D animation involves drawing characters and backgrounds on paper, which are then transferred to cels (transparent sheets made of celluloid) and painted by hand. The cels are then photographed one at a time, creating the illusion of movement when played back at a high enough frame rate. 2D animation has been used in many classic animated films, such as Snow White and the Seven Dwarfs and The Lion King.

Traditional Animation Techniques

• Stop-motion animation: Stop-motion animation involves creating physical models or puppets and moving them incrementally while taking photographs at each step. When played back, the photographs create the illusion of motion. Stop-motion animation has been used in many films, including Wallace and Gromit and The Nightmare Before Christmas.
• Cut-out animation: Cut-out animation involves creating characters and objects out of paper, fabric, or other materials, and then moving them around while taking photographs at each step. The photographs are then played back to create the illusion of motion. Cut-out animation can be a cost-effective way to create animation, as it doesn't require the same level of artistic skill as hand-drawn animation.
• Rotoscoping: Rotoscoping involves tracing over live-action footage frame by frame to create animation. The process was used extensively in the early days of animation and is still used today in some films, such as Richard Linklater's Waking Life.

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Principle of animation

• The principles of animation are a set of guidelines developed by Walt Disney Studios animators Ollie Johnston and Frank Thomas in their 1981 book "The Illusion of Life: Disney Animation". These principles describe the techniques and principles that can be used to make animation look more lifelike, expressive, and appealing to the viewer. Here are the 12 basic principles of animation:
• Squash and Stretch: This principle involves stretching or compressing an object to give the illusion of weight and flexibility. It is often used to exaggerate motion or to show impact.
• Anticipation: This principle involves preparing the viewer for an upcoming action by using a small motion before the main action. For example, a character might pull their arm back before throwing a punch.
• Staging: This principle involves presenting an action or idea clearly and effectively through careful positioning of the characters, camera, and other elements in the scene.
• Straight Ahead Action and Pose-to-Pose: These are two different approaches to creating animation. Straight ahead animation involves creating each frame in sequence, while pose-to-pose animation involves planning out key poses first and then filling in the gaps between them.
• Follow Through and Overlapping Action: These principles involve showing the secondary motion that occurs after the main action, such as a character's hair continuing to move after they have stopped running.

Principle of animation

• Slow In and Slow Out: This principle involves gradually accelerating or decelerating an action to make it appear more realistic.
• Arcs: This principle involves using natural arcs in motion to make animation appear more fluid and natural.
• Secondary Action: This principle involves adding additional motions to an object or character to give them more depth and personality. For example, a character might tap their foot while waiting for someone.
• Timing: This principle involves determining the amount of time it takes to complete an action, which can affect the speed and feel of the animation.,etc.

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Key framing

• Keyframing is a technique used in animation to create the illusion of motion by defining a series of key poses or frames that represent the beginning and end of an action.
• These key poses are then used to create the full animation sequence by filling in the frames between them.
• For example, if animating a bouncing ball, the key poses might be the highest point of the bounce and the lowest point of the bounce.

Character and facial animation

• Character and facial animation are techniques used in animation to bring characters to life by creating lifelike and expressive movements and facial expressions.
• Character animation involves creating movement for a character's body, while facial animation focuses on the movement and expressions of the character's face. Both techniques require careful attention to detail and an understanding of human anatomy and movement.

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Deformation

• In computer graphics, deformation refers to the process of transforming the shape of a 3D model. This is often done to animate a character or object, or to simulate the behavior of a physical system.
• Deformation can be achieved using a variety of techniques, depending on the desired effect and the type of model being deformed
• Example: skeletal deformation, Blend shape animation, lattice deformation, cloth simulation, etc.

Motion capture

• The movements of real people or objects and then use this data to animate 3D models or characters.
• In motion capture, sensors are placed on the subject's body or object to be tracked, and these sensors capture their movements in real-time. This data is then recorded and used to drive the animation of a 3D model or character. By using motion capture, animators can create more realistic and natural movement, as the data is based on real-world movement.

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