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)

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

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.
References in periodicals archive ?
According to both works, there are two ways of building a catadioptric vision system that meets this property: with the combination of a hyperbolic mirror and a camera with perspective projection lens (conventional lens or pin-hole model), as shown in Figure 1(a) or with a system composed of a parabolic mirror and an orthographic projection lens (Figure 1(b)).
The orthographic projection, also known as bird's eye view, can be considered as a specific case of the perspective projection.
In the literature, some algorithms which make use of the orthographic projection in map building, localization, and navigation applications can be found.
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.
Assign students one of the sample orthographic projections. See sample handout projects.
In Part 2 of this activity, the teacher will select a mechanical object that has been drafted as an orthographic projection. The students will then create a cardboard replica of the model to scale and determine the surface area and volume of the object.
* Apply concepts related to orthographic projection.
* Explain the reason for the location of views on an object in an orthographic projection.
This has a practical implication as orthographic projection theory forms the core of the curriculum in technical graphics.
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.