# Thread: Draw a perfect square using two vanishing points

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## Draw a perfect square using two vanishing points

Hi, I have two vanishing points and a rectangle in a perspective, now I would like to draw a perfect square in the rectangle. How can I do?

Thank you!

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I'm sorry but this doesn't seem to work. Example:

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Those vps are intersections between rectangle sides computed by a software.

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Originally Posted by Anid Maro
Drew up a rough example.

Attachment 1468123
Basically in the red is what you should already have, as you had described it.

Take that bottom corner, farthest from the horizon (drawn between the two vps), and draw a straight line perpendicular to the horizon.

Where that new line intersects the edge of the rectangle opposite of the bottom corner, that's where you draw out your square.
No. Construct your vanishing points from your stationary point, and construct the vanishing point of the diagonal from there. In other words: RTFM

6. Anid, those verticals will have to converge as well.

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Mhhh... I would like to draw the square inside the rectangle... Can't I bisect a corner or something similar?

9. Other way.

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Ok, who can explain other ways to do this?

12. how do you determine if the third vp is up or down?

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Originally Posted by Anid Maro
Put it this way, if the third vp is such that as you go farther back shapes get larger then it needs to be the other way. Such as in my earlier mistake.

Another way to put it, place the third vp above the horizon.
No. The question is about constructing squares in perspective. This does not involve a third vanishing point for verticals.

Let me take the freedom to explain what Elwell was trying to say; I beg him to forgive me if he was trying something else. The construction lines that are vertical in your two-dimensional drawing go through the diagonals of parallel squares in your three-dimensional world. As such, they are parallel and will have their single vanishing point. This vanishing point must be constructed first, in order to construct squares.

Again, find yourself an introduction to perspective, it shows up every now and then in this Forum, if you really, really, really want me to use the Search features for you, just ask, and I will refuse...

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I'm sorry but I don't understand, why three vps and so on? Let me ask this using other words: can you tell me how do you verify you have a perfect square in prospective?
I found few topics about this but no one really exaplain how to find sides of a square, some of them are really old and example images are not available anymore.

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Daafone, artistic perspective is not science. Its just a cheesy quick fix to get some stuff in certain locations on your picture to look correct. As soon as you begin to rely on it, it will make your picture awkward looking. You must keep correcting it by eye.
Last edited by kev ferrara; April 26th, 2012 at 12:34 PM. Reason: why muddy the waters...

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17. Not to mention...BUY A BOOK.

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Please point me to a book, in my university books I cannot find anything about perfect squares

20. Sorry....I'm not a hand-holder type. There are hundreds of books on perspective. Pick one. I have seven.

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