# Orthographic Projection

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## orthographic projection

[¦ȯr·thə¦graf·ik prə′jek·shən]
(crystallography)
A projection for displaying the poles of a crystal in which the poles are projected from a reference sphere onto an equatorial plane by dropping perpendiculars from the poles to the plane.
(graphic arts)
(mapping)
A perspective azimuthal projection of one hemisphere produced by straight parallel lines from any point desired from an infinite distance; it is true to scale at the center only.
(mathematics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## orthographic projection

A method of projection in which a three-dimensional object is represented by projecting lines perpendicular to a picture plane. See also: Projection drawing
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Orthographic Projection

a perspective cartographic projection. Because of considerable distortions, it is not used in cartography.

## orthographic projection

Projection in which exact views of an object are constructed by extending perpendiculars from points on the object to the plane of projection.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
To conclude this section, Figure 7 shows (a) an omnidirectional image captured by the catadioptric system presented in Figure 2(a) and the visual appearance of the projections calculated from this image: (b) unit sphere projection, (c) cylindrical projection, (d) perspective projection onto a vertical plane, and (e) orthographic projection.
Caption: FIGURE 6: Projection model of the orthographic projection.
Caption: FIGURE 7: (a) Sample omnidirectional image and some projections calculated from it: (b) unit sphere projection, (c) cylindrical projection, (d) perspective projection onto a vertical plane, and (e) orthographic projection.
They include the spherical, cylindrical, or orthographic projections [25, 28].
* Explain the reason for the location of views on an object in an orthographic projection.
* Apply the conventions of an orthographic projection to create an accurate model.
Have the students re-create the orthographic projection into a 3D model using the supplies they brought in and tools provided.
Pupils will be given a brief to design a futuristic F-1 car, using PTC's Pro/DESKTOP software package, in addition to producing supporting evidence of their concept such as orthographic projections, colour isometric drawings and three-dimensional rendering.
Even in a 3D scenario, the end result is 2D orthographic projections arranged and noted on paper.
Scarpa condenses conventional categories -- sketch, working, shop and presentation drawings -- onto single sheets with meticulously drafted orthographic projections worked and reworked in many freehand layers and surrounded by sketches of perspective views and construction details.
Mylar film or drafting vellum can be used to draw orthographic projections of the casting to better visualize all elevations.

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