Part 2. Study the concept of one point perspective, two point perspective and three point perspective. The image taken by a camera is the central projection of the 3D world onto a 2D plane. Suppose we have a building with three family of parallel lines along x, y and z direction. In one point perspective, there is only one vanishing point. That is, only one family of parallel lines (along z direction) converge to one point in the image (called vanishing point). The following of examples of one point perspective.