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Ychan - ot - perspective tutorials - 131752
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Submitted By Anonymous
Submitted On Aug23/18, 14:33
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One of the things that people find difficult to begin with perpective drawing is to understand where to have the vanishing points. This depends on your "framing" of the image. People may misunderstand that you always have to have the vanishing points inside the drawing.

1) the human visual field is roughly 180 degrees wide
2) the vanishing points of a right angle (e.g the sides of a box) are always 90 degrees apart along a line drawn through the center of the visual field when using two-point perspective.
3) the frame is your canvas. You can place it anywhere you want, but if the visual center falls outside of your frame, your viewer is not actually looking into the picture. You can direct the viewer to look at a certain part of your picture by choosing where the center is.
4) choosing a large frame results in a wide field of view, so objects further away become small. Choosing a small frame results in a narrow field of view - like a camera zooming in

Usually in tutorials the line through the center is considered to be the horizon, but this is not necessarily true. It's simply the center of where your eyes are pointing, and the level is the level of your eyes. This produces a 3D coordinate system relative to where you're looking and how your head is tilted, and you need to rotate the objects in this framework. In other words, the sides of your boxes aren't always pointing at the vanishing points, but they still respect the vanishing points by rotation.

The other way of doing it is to draw a different horizon line for each object in the object's own coordinate system, in which case the lines don't go through the viewer's visual center on the viewer's horizon line - but this is an advanced method that some may find less intuitive.
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