Shoemake K.'s Animating rotations with quaternion curves PDF

By Shoemake K.

ISBN-10: 0897911660

ISBN-13: 9780897911665

Good our bodies roll and tumble via area. In desktop animation, so do cameras. The rotations of those items яге top defined utilizing a 4 coordinate process, quaternions, as is proven during this paper. Of all quaternions, these at the unit sphere are best suited for animation, however the query of the way to build curves on spheres has now not been a lot explored. This paper supplies one resolution by means of offering a brand new form of spline curve, created on a sphere, compatible for easily in-betweening (i.e. interpolating) sequences of arbitrary rotations. either concept and scan convey that the movement generated is tender and ordinary, with no quirks present in previous equipment.

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This may seem like a lot of detail, but it is good programming prac46 tice. A user not familiar with the program can become very frustrated if it does something strange because a mistake was made entering information. Once we determine what type of conversion to perform, the program does the calculation and prints out the temperature entered and the converted temperature. The calculation is just straight math, using the established formula for temperature conversion. After the calculation is finished and answer printed, the program loops back and starts over.

SYNTAX ERROR ask yourself if you made a mistake in typing, or forgot the quote marks. 22 The computer is precise and expects instructions to be given in a specific form. But don't get worried; just remember to enter things as we present them in the examples and you'll get along great with the Commodore 64. Remember, you can't hurt the computer by typing on it, and the best way to learn BASIC is to try different things and see what happens. PRINTis one of the most useful and powerful commands in the BASIC language.

Line 30 adds one to the variable CT. This line counts how many times we do the loop. Each time the loop is executed, CT goes up by one. Line 40 is our control line. If CT is less than 5, meaning we've executed the loop less than 5 times, the program goes back to line 20 and prints again. When CT becomes equal to 5-indicating 5 COMMODORE 64's were printed-the program goes to line 50, which signals to END the program. Try the program and see what we mean. By changing the CT limit in line 40 you can have any number of lines printed.

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Animating rotations with quaternion curves by Shoemake K.

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