This results in showing all orthogonal edges to scale and all parallel edges as parallel, but diagonal and curved lines being distorted and prevents any sort of perspective. There are three kinds of axonometric projections: one in which all three axes are shown with the same scale (isometric), two are the same and one (usually the vertical axis) different (dimetric), and all three different scales (trimetric). Wikipedia, as usual, has details and helpful diagrams. Coined in 1869 from Greek roots axōn axis + métron, measure.
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