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Orthographic Projections
Orthographic Projections
Parallel projection technique Projectors normal to projection plane
Projection Plane
Projector
NOTE: CAD Systems typically use orthographic projection
Orthographic Projection Categories
Axonometric
Three object faces visible
No principal axes parallel/perpendicular to projection plane
Multiview
Only one object face visible
One object face (i.e., two principal axes) parallel to projection plane
Axonometric Projections
Classed according to angles made by principal axes when projected onto projection plane
Trimetric – no equal angles
All principal axes foreshortened unequally Dimetric – two angles are equal
Two principal axes are equally foreshortened
Isometric – all angles equal (iso equal, metric measure)
All principal axes foreshortened equally
Axonometric Projection Classes
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