4. Projections
• Plane of projections
– The transparent plane on
which the projections are
drawn.
• View
– The figure formed on the
plane by the projections of
the faces of an object is
called a view.
• Projectors
– The line or rays drawn
from the object to the
plane is called projectors.
5. Types of projection
• Pictorial projections
– Isometric projections
– Oblique projections
– Perspective projections
• Orthographic
projections
– Only in this view we can
get the true shape and
size.
10. First angle and Third angle projections
• First angle
– Object lies between
observer and the planes
of projection.
– Object is situated on or
above HP and in front of
VP
– Front view comes above
the top view
• Third angle
– Planes of projection lie
between the object and
the observer
– Object is situated below
HP and behind VP
– Top view comes above
front view
