Scribble: Perspective drawing

26th Jun 2020, 3:06 PM
Scribble: Perspective drawing
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Author Notes:

26th Jun 2020, 3:06 PM
(-)_(.) kadaka!
Imagine looking over and down on a short cylinder with equally-spaced verticals, like a round fence with posts as seen here.
I've seen examples of getting the perspective right using vanishing points on the horizon, setting up the elliptical shape. But they don't show something seen in reality, that you'll see fewer verticals in the front than in the back.

This quick sketch shows why. The viewer would see three verticals in front, five in back. In perfect geometry terms, the viewer would always see less than 180° of the circle so for an even number of points they would always see less points in the front.

For an odd number of points there can be more on one half of the circle so it is possible the viewer could see more, like with five points the viewer could see three in front and two in back. The drawing of that is left as an exercise to the reader.
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Comments:

27th Jun 2020, 4:16 AM
area5.1
good point, and what's also often not apparent is that the rear of the oval shape will be distorted the lower to the side that it's viewed. Especially when it's close to the viewer.

But that's a great diagram, showing why the back appears to have more posts.
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