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Chapter 4 : A HISTORY OF COMPUTER ANIMATION 3/20/92 1 4 design (fig . 26) . In America the abstract movement was formalized further by John and James Whitney, who employed mechanical pantographs to control paper cutouts (1944), very much in the linkages tradition of Reiniger . And abstraction will continue to be a theme of the motion graphics school . We develop both of these themes in the sections on Analogue Computer Animation and Motion Graphics/Motion Control . Eastern European countries lead developments in puppet animation ; major works include a feature film by the Russian Aleksander Ptu hko called The New Gulliver (1934) and a phethoria of work bN_ckoslovak Jiri Trnka and others since 1949 . e 1930s and 1940s are also a period of experimentation with still other techniques, including directly drawing on film, the use of sand on glass, the sliced wax block, and the pinscreen (1934), a gridlike screen of sliding pins which forms (for all practical purposes) a physical pixel memory . The pinscreen is lit from the side so as to cast shadows, and thus luminence is analogical to the physical height of the pin, and thus the length of its shadow . Animated pixel graphics thus also anticipated the computer . This leaves us at the advent of the computer . The Origins of the Computer Analog computers Computers date from antiquity and they take many forms . What they share in common is that they employ a methodology to solve problems : extract answers from data and to make preductions . Analogue computers are devices for solving problems that utilize physical quantities capable of continuous change . The physical displacement measures might be distance, rotation, weight, voltages (Wheatstone's bridge is an electrical analog computer), or areas . We are so used to thinking in numbers today that we must remember that analog computers can calculate entirely without numbers by using physical analogs such as eletricity or graphics . Analogue graphical computing devices include the right angle, plumb line, the balance, the compass (all antiquity), the plane table (4913C, modernized after 1620), proportional dividers, parallel rulers, the 26 . Abstract geometric animation . Pioneered in Europe, these frames by Oskar Fischinger from ?? rival the best abstract geometric computer animation and are timeless examples of audiovisual harmony . [locate]
Chapter 4 : A HISTORY OF COMPUTER ANIMATION 3/20/92 1 5 pantograph (1650), as well as the more complicated elliptical trammel (1540), the pantograph to draw parallel curves (1650), the ellipsograph (1790) for drawing ellipses, the volute compass used to draw spirals (1791), and the planimeter (1814) to measure areas . Analog computing instruments may also be calibrated with a numerical scale (fig . 41) . Analog scales are found in the circular zodiac (), the astrolabe (900), which evaluates the season and the angle of the sun to determine the time of day, the protractor to measure angles (), William Oughtred's slide rule (1620) to do multiplication, division, logs, and trig . The technique of harmonic analysis, formulated in 1822 by Jean Fourier also encouraged graphical computing . The harmonic analysis theorm states that a complex waveform may be decomposed into a collection of fundamental sine wave frequencies (figure 42) . One advantage of harmonic analysis was that if a complex phenomenon could be accurately analyized then it could be predicted . The stage was thus set for three major developments : The first of these was Englishman William Kelvin's harmonic analyzer (1876), which accepted a purely graphical input, performed a calculation with linkages and dials, and displayed numerical readout (fig . 43) . The inverse of this machine, the harmonic 41 . Analogue computer examples . A spring scales--the difference in the position of the pointer is analogeous to the difference in the weight of two objects . The slide rule--the difference between two positions on the scale is analageous to the logorithms of the two numbers . The planimeter--the polygonal area, as traced by B, is the distance from A to B times the distance wheel D has rotated . Wheatstone's bridge--an unknown resistance is analagous to balancing it to a known electrical resistance, here about 65 ohms . [to Dick Rauh & Hong] . 41 . Harmonic analysis is especially useful to analyize functions (waveformes) that incorporate periodic, sineasodial frequencies . For example, hourly observations of the height of the tide reveal a pattern of underlying frequencies : a rapid osillation betwen night and day (caused by Earth's spin), a slower frequency of about one month (caused by the Moon's orbit), and a still longer period (caused by Earth's annual orbit) . 41 . Harmonic analyizer is equipted with a stylis to trace an input curve . The stylis in turn is connected by linkages to rotating readout dials inscribed with scales . Kelvin's machine contained 10 readout dials, each of them depicting the amplitude of a different sinewave frequency, and was therefore able to identify up to 10
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Chapter 4: A HISTORY OF COMPUTER ANIMATION ... - Vasulka.org

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