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Concept
3D projection
Summary
A 3D projection (or graphical projection) is a design technique used to display a three-dimensional (3D) object on a two-dimensional (2D) surface. These projections rely on visual perspective and aspect analysis to project a complex object for viewing capability on a simpler plane.
3D projections use the primary qualities of an object's basic shape to create a map of points, that are then connected to one another to create a visual element. The result is a graphic that contains conceptual properties to interpret the figure or image as not actually flat (2D), but rather, as a solid object (3D) being viewed on a 2D display.
3D objects are largely displayed on two-dimensional mediums (such as paper and computer monitors). As such, graphical projections are a commonly used design element; notably, in engineering drawing, drafting, and computer graphics. Projections can be calculated through employment of mathematical analysis and formulae, or by using various geometric and optical techniques.
Projection is achieved by the use of imaginary "projectors"; the projected, mental image becomes the technician's vision of the desired, finished picture. Methods provide a uniform imaging procedure among people trained in technical graphics (mechanical drawing, computer aided design, etc.). By following a method, the technician may produce the envisioned picture on a planar surface such as drawing paper.
There are two graphical projection categories, each with its own method:
parallel projection
perspective projection
File:Orthographic perspective arch.svg|[[Multiview projection]] (elevation)
File:Isometrie.png|[[Isometric projection]]
File:Militärperspektive.PNG|[[Oblique projection|Military projection]]
File:Cabinet perspective 45.svg|[[Oblique projection|Cabinet projection]]
File:1ptPerspective.svg|[[One-point perspective]]
File:2-punktperspektive.svg|[[Two-point perspective]]
File:3-punktperspektive 1.svg|[[Three-point perspective]]
Parallel projection
In parallel projection, the lines of sight from the object to the projection plane are parallel to each other.
Official source
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