Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Parallel projections have lines of projection that are parallel both in reality and in the projection plane. Parallel projection corresponds to a perspective projection with a hypothetical viewpoint e.g., one where the camera lies an infinite distance away from the object and has an infinite focal length, or "zoom". Within parallel projection there is an ancillary category known as "pictorials". Pictorials show an image of an object as viewed from a skew direction in order to reveal all three directions (axes) of space in one picture. Because pictorial projections innately contain this distortion, in the rote, drawing instrument for pictorials, some liberties may be taken for economy of effort and best effect.
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