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ASSAIGNMENT Graphical Projection

# ASSAIGNMENT Graphical Projection - ASSAIGNMENT ON GRAPHICAL...

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ASSAIGNMENT ON: GRAPHICAL PROJECTION SUBMITTED TO: Mr. AWAIS ADNAN SUBMITTED BY: SHERAZ MUHAMMAD KHAN BBA-IT(HONS) 3rd SEMESTER DATE: 28/03/2008 INSTITUTE OF MANAGEMENT SCIENCES, PESHAWAR

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Projection Introduction: Graphical projection is a protocol by which an image of an imaginary three-dimensional object is projected onto a planar surface without the aid of mathematical calculation. The projection is achieved by the use of imaginary "projectors". The projected, mental image becomes the technician’s vision of the desired, finished picture. By following the protocol the technician may produce the envisioned picture on a planar surface such as drawing paper. The protocols provide a uniform imaging procedure among people trained in technical graphics (mechanical drawing, computer aided design, etc.). Types of Projections: The two common types of projections are classified according to the geometric properties of the rays. Perspective: When the rays are not parallel, but converge to the eye position. Parallel: When the rays are parallel to each other and perpendicular to the plane. Further classification of projections, involving relative positions of object, observer, and plane of projection, are possible, as indicated by the following chart.
1. Perspective Projection In perspective projection, the visual rays converge at a point. The representation on the transparent plane may be considered the view that would be seen by a single eye at a known point in space. The picture is formed on the transparent plane by the intersecting points of the projecting lines from the eye to the object. The size of the view will vary as the relative positions of the eye, the projection plane, and the object are altered. Although perspective projection produces a realistic pictorial view of the object, its distortion of angles and distances prevents its meeting the exacting requirements demanded of a technical drawing. Perspective projection is used primarily by architects and commercial artists to describe the external appearance of an object. One-point perspective occurs when the projection plane is parallel to two principal axes. Conversely, when the projection plane is perpendicular to one of the principal axis, one point perspective occurs. Receding lines along one of the principal axis converge to a vanishing point. A one-point perspective is used almost exclusively for interior-room views. It gives the observer the illusion of looking into the room.

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ASSAIGNMENT Graphical Projection - ASSAIGNMENT ON GRAPHICAL...

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