Multiview Drawings Part 1 - MULTIVIEW DRAWINGS 1 2-D projection 3-D object View point Lines of sight Picture plane(paper or computer screen Engineering

Multiview Drawings Part 1 - MULTIVIEW DRAWINGS 1 2-D...

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MULTIVIEW DRAWINGS - 1
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Picture plane (paper or computer screen) 3-D object View point Lines of sight 2-D projection Engineering graphics are obtained by projection from the 3-D object to the viewing surface (the picture plane)
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GL2:3 Perspective projection is rarely used in manual drawing Types of projection Rather, we us a variety of orthographic projections, for which the projection rays are parallel
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Picture plane (paper or computer screen) 3-D object View point at In orthographic projection, the projection rays are parallel (view point at infinity) Parallel lines of sight 2-D projection
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Perspective vs. Parallel Projection PERSPECTIVE PROJECTION Object is positioned a finite distance from the viewer and is viewed from a single point. Lines of sight are converging, not parallel Mimics human eye behavior PARALLEL PROJECTION Object is positioned at an infinite distance and viewed from multiple points. Lines of sight may be perpendicular to plane of projection (orthographic) or inclined relative to the plane of projection (oblique)
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Classification of Projections: Each classification of projection has a particular purpose from production use…to technical illustration.
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Projection types: Projection type is defined by the “line of sight” from the observer. We will see Axonometric and Oblique projections more in a later chapter
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Let’s now look at multiview drawings in more detail…..
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Multiview Projection See Fig. 10.1 to locate the multiview projections in the taxonomy of projections: Projection Parallel projections Orthographic projections Multiview projections Line of sight Projection plane Object
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Multiview Projection
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  • Spring '14
  • Honkan,A.
  • Map projection, Orthographic Projection, Parallel projection, Graphical projections, Multiview Drawings, oblique projection

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