Basic Difference Between 1st Angle & 3rd Angle Projection

The Difference between the 1^st angle projection & 3^rd angle projection is comparatively very simple and is very clear. Firstly we need to understand the planes and quadrants.

There are two planes.

1.       Vertical Plane(V.P)

2.       Horizontal Plane(H.P)

Vertical Plane(V.P):

1. A plane that passes through a vertical line.                                                                                      

2. A plane of perspective passing through the point of sight and perpendicular to the ground plane and to the picture.

Horizontal Plane(H.P):

1. A Plane that passes through the horizontal line.

2. A plane of perspective passing through the point of sight and horizontal to the ground plane and to the picture.

The Above diagram shows the clear view of the quadrants.

Here  to clearly know the projections you need to thoroughly know the above drawing.

All world wide we use only two kinds of projection.

1.       1^st Angle Projection

2.       3^rd  Angle Projection.

The difference is clearly mentioned in the below diagram

	Difference Between 1st Angle & 3rd Angle Projection
	1st Angle	3rd Angle
1	V.P/H.P	H.P/V.P
2	Object lies between viewer and plane	Plane lies between viewer and object
3	In India & European countries	In USA