Difference between first angle of projection and third angle of projection.

Question

Accepted Answer

First angle and third angle of projection are two different methods of creating orthographic projections of a 3D object.

First angle projection is commonly used in Europe and Asia, while third angle projection is commonly used in North America.
In first angle projection, the object is placed in front of the viewing plane and the views are projected onto the planes behind it.
In third angle projection, the object is placed behind the viewing plane and the views are projected onto the planes in front of it.
The symbol used to indicate first angle projection is a square with a dot in the center, while the symbol for third angle projection is a square with no dot.
It is important to know which projection method is being used when interpreting technical drawings and blueprints.

Popular interview questions of Technical Illustrator