Since the 1920s axonometry, or parallel perspective, has provided an important graphic technique for artists, architects, and engineers. Like linear perspective, axonometry helps depict 3D space on the 2D picture plane. It usually comes as a standard feature of CAD systems and other visual computing tools. However, axonometry originated in China. Its function in Chinese art was similar to linear perspective in European art. Axonometry, and the pictorial grammar that goes with it, has taken on a new significance with the advent of visual computing. Although research on axonometry's origin is far from complete, I summarize its main features. Axonometry is part of a coherent pictorial language and a valuable alternative to photorealistic imagery based on European linear perspective. Axonometry is an essential feature of CAD systems and multimedia authoring programs. Most visual computing tools use a combination of axonometry and isometry with linear perspective to create anything from computer games to virtual reality worlds.
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