Compare 2-D and 3-D wire-frame modelling with respect to their utility for an engineering industry.

1.2-D used for drawing of simple 2-dimensional objects.

   3-D used for drawing of complicated 3-dimensional objects.

2.2-D requires only one global coordinate system.

   3-D may require use of several user defined coordinate systems to create features on various faces of the       part.

3.2-D is difficult to reconstruct 3-D images.

   Along with 2-D images , 2-D views and even pictorial views can be generated easily.

4.In 2-D ends of lines are represented by (x,y) coordinates.

   in 3-D ends of lines are represented by (x,y,z) coordinates.

5.Curved edges are represented by circles, ellipses, splines, etc.

   In 3-D curved edges are represented by suitable spaced generators.

6.In 2-D to correctly represent a complex object, additional views and sectional views are required.

   In 3-D using hidden line/surface elimination complex components can be interpreted correctly.