The point, where an object goes out of sight, is called the vanishing point. The vanishing point must be on the horizon line. If one is looking down an object the vanishing point will be directly in front of the viewer, at a point right between the eyes. The main difference between perspective and isometric drawing is that the view of an isometric object does not depend on the spectator point or how far away from the observer the object is. Lines in perspective drawing that are not perpendicular to the observer's viewpoint all appear to lead towards a vanishing point. (Figures -5,6 &7)
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