ENGINEERING GRAPHICS 1E7

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Presentation transcript:

ENGINEERING GRAPHICS 1E7 Lecture 8: Perspective

Perspective/Central projection Perspective is a geometric method of representing on paper the way that objects appear in real life i.e. they get smaller and closer together the further away they are from the eye of an observer. It is the most realistic of all pictorial drawings It is is the way real three-dimensional objects are pictured in a photograph that has a two-dimensional plane Perspective or central projection is used in creative art or technical sketching but seldom in technical drawing

Projectors or line of sights are not parallel to each other

Perspective System MAIN ELEMENTS The observer’s eye The object The plane of projection Line of sight

Perspective System Observer’s eye is station point SP and the visual rays are the line of sights Picture plane is the plane of projection or the paper Visual ray at eye level marks horizon on picture plane

Perspective System

Centre Line of Vision The Centre Line of Vision intersects the projection plane/picture plane at the Centre of Vision (CV).

Vanishing Point The lines parallel to each other but not parallel to the picture plane converge towards a single point on the horizon - VANISHING POINT

Perspectives

Cone of vision

Types of Perspective 1-point perspective/Parallel perspective 2-point perspective/Angular perspective 3-point perspective

One-point Perspective One face of object is parallel to picture plane, one VP

Two-point Perspective Object at angle with picture plane, but vertical edges are parallel to picture plane, two VP

Three-point Perspective No system of parallel edges with picture plane, three VP