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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.
The primary views include plans, elevations and sections; and the isometric, dimetric and trimetric projections could be considered auxiliary views. A typical (but non-obligatory) characteristic of multiview orthographic projections is that one axis of space usually is displayed as vertical.
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 ...
If all foreshortenings are different, the projection is called trimetric. The parameters in the diagram at right (e.g. of the house drawn on graph paper) are: =, =, = =, = / . Hence it is a dimetric axonometry. The image plane is parallel to the y-z-plane and any planar figure parallel to the y-z-plane appears in its true shape.
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.
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.
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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.