Definition
In linear perspective, straight lines remain straight, but parallel lines do not remain parallel: objects appear smaller the further away they are, so parallel lines converge to a vanishing point.
How many vanishing points can a perspective drawing have?
Answer parallel to the picture plane do not converge.
Infinitely many: one per direction of parallel lines in the scene. Lines
Natural vs. linear perspective
Natural perspective (Euclid): more distant objects subtend smaller visual angles. Linear perspective (Brunelleschi, 1413): the image is formed by intersecting the lines of sight with a picture plane. The ratios differ: .
Tilting the picture plane (or rotating the camera around its center) changes the number and location of the vanishing points.
Appears in
- Lecture 2.1, The Laws of Perspective
- Lecture 2.1, Vanishing Points: facade and column questions