Viewing

We now investigate the multitude of ways in which we can describe our virtual camera. Along the way, we examine related topics, such as the relationship between classical viewing techniques and computer viewing and how projection is implemented using projective transformations.
There are three parts to our approach. First, we look at the types of views that we can create and why we need more than one type of view. Then we examine how an application program can specify a particular view within OpenGL.. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . .