ADMICRO

Animation traditionally is done by hand-drawing or painting successive frame of an object,  each slightly different than the proceeding frame. In computer animation, although the computer  may be the one to draw the different frames, in most cases the artist will draw the beginning and  ending frames and the computer will produce the drawings between the first and the last drawing.  This is generally referred to as computer-assisted animation, because the computer is more of a  helper than an originator. 
In full computer animation, complex mathematical formulas are used to produce the final  sequences of pictures. These formulas operate on extensive databases of numbers that defines the  objects in the pictures as they exist in mathematical space. The database consists of endpoints,  and color and intensity information. Highly trained professionals are needed to produce such  effects because animation that obtains high degrees of realism involves computer techniques from three-dimensional transformation, shading, and curvatures. 
High-tech computer animation for film involves very expensive computer systems along  with special color terminals or frame buffers. The frame buffer is nothing more than a giant image  memory for viewing a single frame. It temporarily holds the image for display on the screen. 
A camera can be used to film directly from the computer’s display screen, but for the  highest quality images possible, expensive film recorders are used. The computer computers the  positions and colors for the figures in the picture, and sends this information to the recorder,  which captures it on film. Sometimes, however, the images are stored on a large magnetic disk  before being sent to the recorder. Once this process is completed, it is replaced for the next frame.  When the entire sequence has been recorded on the film, the film must be developed before the  animation can be viewed. If the entire sequence does not seem right, the motions must be  corrected, recomputed, redisplayed, and rerecorded. This approach can be very expensive and time – consuming. Often, computer-animation companies first do motion tests with simple computer  generated line drawings before selling their computers to the task of calculating the high resolution, realistic-looking images.

According to the passage, the frame buffers mentioned in the third paragraph are used to .......

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