If the projection lines are parallel to each other and the image plane is also
perpendicular (normal) to the projection
lines, the result is what is known as an
orthographic projection.http://moodle.sjconline.ca/file.php/123/CADORTHO.pdf
In performing orthographic projection, each of 2D views shows only two of the three dimensions
(height, width, and depth) of the 3D object.
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