PERSPECTIVE PROJECTION
If the rays of sight emerging from the object tend to meet at any station point and a
picture plane is introduced in between, the view obtained on this picture plane will
be a perspective view and the method c-f projection will be perspective projection.
Suppose the observer is standing at a finite and comparable distance from the
object. Rays of sight, in this case, will emerge from all points of the object and will
converge in the eye o-f the observer called station point. The view obtained in the
eye of the observer will then be a perspective view; the same view is obtained we
introduce a transparent picture plane in between the observer and the object. Angle
of vision for all parts of the object will be different and hence the dimensions will
vary from point to point. Besides the view obtained in our yes, camera photograph is
a good example of the perspective view. Advantage of a perspective view is that the
three
Fig. 3.3 Perspective Projection.
dimensional outer shape of the object may easily be conceived, that is why this type of
view is generally used by the architects to convince their clients. In some cases,
perspective views are also shaded and coloured to improve the appearance of a
building showing the surface finishes also. Advantages of the perspective view are that
they are more difficult to draw and further actual dimensions are not represented on
it.
