This material is
very useful for the students, as well as, the teachers. Even before
the topic on Orthographic Projections is introduced, a student can
go on a visual tour and see a variety of objects in space. When
opened in Auto-CAD, the objects can be viewed from all directions by
using simple commands. If a few objects are shown as 3-D models, it
promotes the interest in the subject. The objects can be cut or
“sliced” in front of the audience, thus introducing the topic on
sectional views.