A Developer THOUGHT

Algorithm  Take input edges (Edges contain two vertices ) successively for a given polygon. Output is a new vertices Don't panic see the description of wonderful explanation. 

Figure 1 Perspective in the graphic arts, such as drawing, is an approximate representation, on a flat surface (such as paper), of an image as it is seen by the eye.(wikipedia)

3D Roataion in OpenGL in C++ Code Updated : 25/07/2014 @ 06:16 AM There are small changes occur...

Using OpenGL Library in C++ to projecting the cube. Projection mean show 3D points in 2D plan.

Projecting a 3D barn in 2D view plan.