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The three types of axonometric projection are isometric projection, dimetric projection, and trimetric projection, depending on the exact angle by which the view deviates from the orthogonal. [2] [3] Typically in axonometric drawing, as in other types of pictorials, one axis of space is shown to be vertical.
Axonometric projection is further subdivided into three categories: isometric projection, dimetric projection, and trimetric projection, depending on the exact angle at which the view deviates from the orthogonal. [3] [4] A typical characteristic of orthographic pictorials is that one axis of space is usually displayed as vertical.
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There are three main divisions of axonometric projection: isometric (equal measure), dimetric (symmetrical and unsymmetrical), and trimetric (single-view or only two sides). The most common of these drawing types in engineering drawing is isometric projection. This projection is tilted so that all three axes create equal angles at intervals of ...
Example of a dimetric perspective drawing from a US Patent (1874) Example of a trimetric projection showing the shape of the Bank of China Tower in Hong Kong . Example of dimetric projection in Chinese art in an illustrated edition of the Romance of the Three Kingdoms , China, c. 15th century CE .
Orthographic projection (also orthogonal projection and analemma) [a] is a means of representing three-dimensional objects in two dimensions.Orthographic projection is a form of parallel projection in which all the projection lines are orthogonal to the projection plane, [2] resulting in every plane of the scene appearing in affine transformation on the viewing surface.
Parallel projections (oblique, planometric, isometric, dimetric, and trimetric), and; many types of perspective projections (with one, two, or three vanishing points). Technical illustration and computer-aided design can also use 3D and solid-body projections, such as rapid prototyping.
Thus the left view is placed on the left and the top view on the top; and the features closest to the front of the 3D object will appear closest to the front view in the drawing. Third-angle projection is primarily used in the United States and Canada, where it is the default projection system according to ASME standard ASME Y14.3M.