What is animation (Mainly 12 principles of animation briefly) and animator?
Animation in Computers
An animation is defined as a visual change in a scene with respect to time. The visual change in the scene is not only associated with the change in the position of the object, but also with its shape, color, transparency, structure and texture. An important point about animation is that it usually signifies the hand drawn or artificially drawn sequence of images, which contrasts to the movies where actors’ performances with real-world scenes are recorded. In early times, animations were made by hand by drawing every scene one by one on paper and then painted. This method was obviously very troublesome and time-consuming. Nowadays, the use of computer technology has made the animation process progressively simpler and more powerful. The process of drawing images and playing them back at a high speed with the help of computer software in order to create an illusion of movement is referred to as computer animation. The illusion of movement is created by displaying an image on the computer screen, then quickly replacing it by a new image, which is similar to the previous image, but shifted slightly.
A basic approach to design an animation sequence consists of the four stages, namely, storyboard layout, object definitions, key frame specifications, and generation of in-between frames.
i. Storyboard layout: The storyboard is an outline of the action. This stage basically defines the motion sequence of the object as a set of basic events that are to take place. For example, while creating an animation sequence of cricket play, the storyboard layout would consist of action and motion of batting, bowling, fielding, running, and so on. Depending on the type of animation to be created, the storyboard consists of a set of rough sketches, models, or even in some cases it could be verbal description or list of basic ideas of the motion.
ii. Object definitions: Once the storyboard layout has been prepared, the next step is to define all the objects or participants in the action. The objects are generally described in terms of their dimensions, shapes (such as polygons or spline surfaces), colors, movements, or any other additional information which can help in defining the objects. For example, while creating animation for cricket play, the object definitions could be player’s dimensions, colors of their uniform, dimensions of the ball, bat, stumps, etc.
iii. Key frame specifications: The next step in the process of creating animation is to specify key frame specification. A key frame is a detailed drawing of the scene at a certain time in the animation sequence. In each key frame, the position, color, shapes, etc., of all the objects is positioned according to a particular point of time for that frame. More the number of frames, smoother will be the animation. For complex motions, one need to specify more key frames as compared to simple, slowly varying motions. Some key frames are specified at extreme positions, where others are spaced such that the time interval between them is not too large.
iv. Generation of in-between frames: Once the key frames are specified, the next step is to generate intermediate frames. The total number of in-between frames required for an animation depends on the display media that is to be used. For example, film requires 24 frames per second, and graphics terminals require more than 60 frames per second. Typically, time intervals for the motion are set up such that there are three to five intermediate frames between any two key frames. In addition, some key frames can also be duplicated depending on the speed specified for the motion. For example, for a one-minute film sequence with no duplication, 1440 frames would be required, and if we put five intermediate frames between any two key frames, then 288 key frames would only be required.
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