The rules assume that parallel lines that sit on the same plain or surface in space will always appear to converge at what is called the “vanishing point.” The vanishing point is always at the “horizon line” which is always at eye level relative to the viewer. This means that no matter how high above the ground you are the horizon will always appear to be at eye level. It is at this horizontal line that you will establish any and all vanishing points. These basic rules govern the use of “one point perspective.”
As we will explore later, sometimes the horizon and the vanishing point are hidden. In these cases the use of orthogonal or converging lines is crucial to drawing each object correctly in space. Below is an example of an environment in which the perspective has been established prior to adding details.
Using the orthogonal lines as the far edges of the rails, I constructed a set of railroad tracks receding in space. The addition of clouds suddenly converts the upper half of the drawing into sky.
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