In this example, the assistant has to use visual judgment to find a series of key points that link the important midpoints between the two shapes. The assistant lightly marks these points (usually in blue pencil) before making the final breakdown drawing. Having accurately plotted the key points, the assistant then links the key points in a smooth, natural line, which constitutes the finished breakdown drawing. After the breakdown drawing is completed, the inbetweens are achieved in an identical way—with 3 drawn between 1 and (5), and 7 drawn between (5) and 9.
If the shape is changing, it is almost always necessary for the position of one key to be different from the position of the next key. The first shape might be in one part of the screen and the transformed shape in another area.
In this situation, even greater visual judgment must be exercised by the assistant. First, the center points of the two shapes must be lightly drawn in blue; then the center key point of the breakdown drawing is marked on its separate sheet of paper.
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