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# Linear perspective interactive

Interactive created by Phil Fulks
The colorful buttons at the top left hide or reveal elements
"B" allows you to adjust the orthogonals
"C" allows you to adjust the upper transversals
"D" allows you to adjust the second vanishing point along the horizon line
"VP" allows you to manipulate the vanishing point along the horizon line
When Brunelleschi (re)discovered linear prespective circa 1420, Florentine painters and sculptors became obsessed with it, especially after detailed instructions were published in a painting manual written by a fellow Florentine, Leon Battista Alberti, in 1435. John Berger, an art historian, notes that the convention of perspective fits within Renaissance Humanism because "it structured all images of reality to address a single spectator who, unlike God, could only be in one place at a time." In other words, linear perspective eliminates the multiple viewpoints that we see in medieval art, and creates an illusion of space from a single, fixed viewpoint. This suggests a renewed focus on the individual viewer, and we know that individualism is an important part of the Humanism of the Renaissance.

## Want to join the conversation?

• This is wonderful! It really shows how just a few small changes can radically change the viewer's perspective on the room - while still looking completely realistic!
• Yes, this is the best resource ever, to show how position and perspective are represented differently on paper. Fantastic!
• What do "V", D", and "H" stand for?
• V is for vanishing point; H for horizon and D is for the diagonal lines
• If I wanted the tiles on the floor to represent perfect squares ( not rectangles that sort of look like squares) what method would I use to achieve this?
• The videos on Linear Perspective here do not go into the observer and how they relate to the measuring point, which dictates the distortion of foreshortened space. You may wish to create a standard lens if you want the squares to feel square and not rectangular. Standard lens is generally accepted as between 35mm and 65mm, depending on the crop factor. You can calculate the proper lens type by creating a cone of vision, which also can only be calculated from the station point. This will tell you how distorted or not distorted your foreshortening will be. Once you have a canvas that resides within the cone of vision that will give you the lens that you desire, you must maintain the position of the station point, relative to the horizon line, relative to your vanishing point(s), relative to your measuring point(s) for the entire picture. Otherwise you must start over because changing these points will change the perspective.
• How about a programmer's perspective (no pun intended), and perhaps we could see the source code?
• What kind of math can be done with linear perspective?
Any matrix algebra?
How can we take a real view out the window and estimate the length of the VP if we were to make a sketch?
• 59 + 100 = 159
(1 vote)
• What does "orthogonal" mean?
• Orthogonal lines are perpendicular to each other; they meet at right angles.
• Does "D" (the 2nd Vanishing Point or Distance Point) move the single viewer closer/farther from the object?
• It's like changing the lens on your camera to give you a wider or narrow field of vision thus the appearance of either deepening or flattening the viewed space.