vanishing points.....................................

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1. ## vanishing points.....................................

if you stand in the middle of a sidewalk and look down it will get smaller and so the vanishing point should be in the middle of the side walk. But if you stand a little bit to the right where will the vanishing point be (in this case i want the vanishing point to change and not the person's viewing position)?

and how far do you put the two vanishing points? will it always be on the edge of the paper?

and what are the things that are excluded from the 2 point and middle vanishing points?such as roof tops.

can you move the middle vanishing point away from the middle?

Last edited by Vay; October 17th, 2009 at 07:23 PM.

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3. you can have as many vanishing points in an image as you want, as a vanishing point just refers to an angle.
So say you have 2 cubes sitting on the ground, but rotated differently, you would need to set up two sets of vanishing points.

One point perspective is the same as two point, except that one of the points are parallel to the "lens" so all the horizontal lines are parallel in the drawing.

As far as how wide across, well as a general rule they will be far off the page, in which point you just need to practice approximating it. Try reading up on lenses, they will explain why the vanishing points get wider and closer together.
(read the focal length parts http://en.wikipedia.org/wiki/Photogr...d_focal_length)

Last edited by Muz; October 17th, 2009 at 08:17 PM.

4. Originally Posted by Muz
One point perspective is the same as two point, except that one of the points are parallel to the "lens" so all the horizontal lines are parallel in the drawing.
One point also turns into two point when you plot the vanishing points of the diagonals.

5. Go out to a sidewalk and look That's always the easiest way.

6. Vay, I've created a diagram for you.

Originally Posted by Vay
if you stand in the middle of a sidewalk and look down it will get smaller and so the vanishing point should be in the middle of the side walk. But if you stand a little bit to the right where will the vanishing point be (in this case i want the vanishing point to change and not the person's viewing position)?

Refer to the diagram below: if you move a little to the right, you move your eyeball that direction AND you consequently move the Central Visual Ray to the right. Think of the Picture Plane as a giant plexiglass window in front of you that you can draw on.

and how far do you put the two vanishing points? will it always be on the edge of the paper?

NO! In the case below (of which Elwell speaks) the distance of the eyeball to the Picture Plane fixes the dimensions of the set-up. Each DVP will "cut" the Picture Plane if you use the eyeball as a vertex and draw a line 45 degrees from the central visual ray on each side.

and what are the things that are excluded from the 2 point and middle vanishing points?such as roof tops.

You can draw roof tops in one and two-point if your eyeball is situated above the roof top.

can you move the middle vanishing point away from the middle?

YES! Conceptually, you have to think of the "rays" illustrated below as shooting out of the eyeball. The Central Visual Ray is always gonna be the Central Visual Ray. What you CAN do is either move your eyeball in relation to the Picture Plane OR move your Picture Plane in relation to your eyeball. SO, THAT movement would allow the One-Point Vanishing Point to be located where you want it in your actual picture.

NOTE: No matter where you move the VP, the Central Visual Ray is ALWAYS considered to be PERPENDICULAR to the Picture Plane
Muz is CORRECT on differing VPs (on the same horizon line) being needed for cubes that are rotated at differing angles to the Picture Plane. [But, that's a discussion for another time!]

But again remember: the distance of the eyeball from the Picture Plane fixes the geometry of everything that you are doing.

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