PLANES OF PROJECTION
Plane
Plane is a two dimensional smooth surface having the third dimension negligible.
Projection
Projection is the process of causing an image to be formed by rays of sight emerging
from an object taken in a particular direction from the object to a picture plane.
Planes of Projection
Plane of projection is actually the picture plane over which image of the object is
formed. Picture plane, in case of engineering drawing, may be considered as the
drawing paper while the image formed on the picture plane is called a view.
There are three general planes of projection namely frontal, end or profile, and
horizontal plane as shown in Fig. 3.8.
Frontal Plane: Any plane parallel to a vertical plane passing through main
features of the object on the front is called frontal plane.
This plane shows height and length of the object. Frontal plane is ab.ays defined with
reference to the object while the other two planes are later defined with reference to it
without Considering the object itself.
End Or Profile Plane: Any vertical plane at right angle to the frontal plane is
called end or profile plane which includes height and width of the Object.
Horizontal Plane: As the name implies this plane is horizontal and is at right
angle to both the frontal and the profile planes.
This plane includes length and width of the object.
