complex single point perspective
(bristol, ct, usa)
Question: using point perspective either in 1, 2, or 3 points is great for mapping the illusion of depth in drawing, but i find that it doesn't readily lend its self to mapping a free and organic world. Using sinlge point to render the interior of a typical room everything falls on a ridiculously structured grid and doesn't represent accurately any room that an individual actually lives in. But in a more realistic setting the same room would contain objects that do not align themselves perfectly with the OCD grid. For example: on a rectangular table aligned with the single point grid lets drop a cube, but place it more naturally so that it's "twisted" against the grid but keep it in true perspective in the room and on the table. Is there a formula for this? or is it even possible without employing 2 point perspective?
Answer: You are correct. The rules of perspective do not lend themselves to drawing organic or complex landscapes. In the example you mention you would have to employ 2 point perspective for the "twisted" cube - the two new vanishing points can be placed along the same horizon line (no need to draw a new one). If you put another cube that is "twisted" at a different angle than the first it will need it's own two vanishing points. When drawing a complex room you could potentially have both one and two point perspective objects - and the two point perspective objects will each have their own respective vanishing points (not shared). It can get quite complicated. Now, if you add a box that is not just twisted, but also "tilted", it will need it's own new horizon line! As you can imagine, it can soon become a mathematical nightmare ;) ... but it can be done if you have the patience and persistence.
However, I recommend trying out the Measuring technique
instead of, or in addition to the rules of Perspective, when drawing complex scenes. You can roughly find angles using Measuring and plug in the rules of perspective to achieve a more realistic depth.