lect06_Projections_2pp - Planar Geometric Projection...

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1 Planar Geometric Projection Perspective Projection Parallel Projection Classification of Projections
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2 Parallel Projections • Preserves object size – Edges parallel to the view plane maintain their lengths after projection • Preserves parallelism – Lines that are parallel stay parallel after projection Types of Parallel Projection • Orthographic projection – Projectors orthogonal to the view plane • Oblique projection – Projectors not orthogonal to the view plane
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3 Multi-view Orthographic Projection • Projection plane is one of coordinate planes Axonometric Orthographic Projections • Projection plane is not one of coordinate planes Isometric Dimetric
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4 Oblique Projections • Projectors not orthogonal to projection plane – The projection plane is parallel to a feature face of the object – Classified by the angle between projector and plane Cavalier: 45 degree Cabinet: arctan(2) =63.4 degree Parallel Projections in Drawings
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5 Perspective Projections • Exhibits foreshortening
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This note was uploaded on 03/03/2010 for the course CSE 451 taught by Professor Xu during the Spring '10 term at Washington University in St. Louis.

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lect06_Projections_2pp - Planar Geometric Projection...

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