Here’s our viewer looking at a simple box. While we just learned how to manage the viewer’s height, viewing angle and distance, we still need to discuss how to deal with objects and their vanishing points.
Vanishing points tell us where the receding parallel lines of an object converge on the horizon. We use them to describe how the sides of a form move back and away from the viewer.
From the top view, it’s easy to see how vanishing points work. If you were to draw lines from the station point that are parallel to the sides of your specific box, you’ll find your vanishing points as soon as these lines intersect the horizon line.
Important Things To Remember: • Vanishing points come off of the station point at 90 degrees. • If the box turns, the vanishing points move with it. • If the viewer moves closer or farther away from the picture plane, the vanishing points move in or out accordingly. Try it out! • These rules apply not only when looking down at everything, but also when drawing.
Start with the basic setup and add your vanishing points by drawing a 90 degree angle from the station point. The direction of your 90 degree angle determines the way that the box is turned for the viewer.
This was a just a quick run through so we could use the ideas that we’ve talked about in the previous tutorials. Once you understand how this works, it’s easier to move forward with the many other things perspective has to offer. If you’ve ever struggled with accurately controlling scale, measuring, casting shadows or drawing reflections, perspective will help you get there. Having a sense of the mechanics of perspective also makes it easier to understand the many shortcuts available. A lot of these ideas can easily make their way into your sketching. You can find out about all of this and more in the Simplifying Perspective book.