2. Projections (1)
Projections transform points from n (here, n = 3)
dimensional space into a space of dimension less than
n (here, n = 2)
Points to be considered,
Location of object
Location of observer
Plane of projection
Projectors
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6. Parallel Projections
Projectors are parallel to each
other but not perpendicular to
projection plane
Effective in pictorially
representing objects
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7. Axonometric
The object is tilted and
all three coordinate axes
are visible in any one
view
(PP projection plane)
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8. Orthographic (Orthogonal)
The object is at rest and
two coordinate axes are
visible in any one view
(PP projection plane)
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9. Multiview Projections
Front surfaces of object is parallel to plane of projection
Projectors or line of sights are perpendicular to
projection plane
Projectors are parallel to each other and originate from
any point on object
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15. First Angle Projection
3
Points to remember:
• The ‘front view’ (or elevation) is the view
with maximum information.
•The ‘plan’ is below the ‘elevation’ (in
projection).
•The ‘end view’ is placed on the right if
viewed from left side of object and on the
left if viewed from right side.
•‘End view’ and plan face inwards from
‘elevation’.
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