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Thread: Draw a perfect square using two vanishing points

  1. #14
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    Please point me to a book, in my university books I cannot find anything about perfect squares
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  3. #15
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    Sorry....I'm not a hand-holder type. There are hundreds of books on perspective. Pick one. I have seven.
    What would Caravaggio do?
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  5. #16
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    http://www.handprint.com/HP/WCL/pers...#measurepoints
    Also, about Anid's diagram... all parallel lines on the same plane will converge on the same horizon line. The diagonals of the squares and their sides are on the same plane, meaning that this "3rd vanishing point" must be on same horizon as the other two...
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    Deleted my posts on account I don't want incorrect information sticking around.

    I 'squared' away, so to speak, my earlier mistake but I'm not going to bother any farther, as evidently squares in perspective are some arcane secret to only be answered with "read the fucking manual" and "Look up your own tutorial, don't bother me".

    Not that it's everyone's attitude, but it seems to be the prevailing one.

    So sorry Daafone, I guess go read a book or figure it out or something.
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  9. #19
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    @Anid Maro: thanks for your help
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    I don't think it should be "Go read a damn book"

    I think the problem is possibly a person should read it first, and what can't be explained should be asked. I've seen threads ask about perspective after the person has read a book and gained better understanding.

    A good amount of the information is from people repeating what they've learned from a book combined with personal experience.

    Also Perspective Made Easy is a very CHEAP book
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  11. #21
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    Quote Originally Posted by Arshes Nei View Post
    I don't think it should be "Go read a damn book"
    I never said that, I wrote 'RTFM'...
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    Arshes, I'm trying to figure this out since months, do you really think I didn't read anything about perspective? My difficoult is due to terms as english isn't my main language.
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    Quote Originally Posted by daafone View Post
    Arshes, I'm trying to figure this out since months, do you really think I didn't read anything about perspective? My difficoult is due to terms as english isn't my main language.
    English being a second language is understandable, but reading may not be comprehending.

    When you want a "perfect square" do you understand it's relevant in terms of perspective?

    And really, I've been figuring out perspective for years, and I know people still trying to figure it out even as professionals.
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  14. #24
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    Quote Originally Posted by kev ferrara View Post
    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.
    I agree here. However, if things are taught, then I prefer a correct approach. Personally, I like to include a perfect square in my perspective construction, it helps me to measure things up. I know about measuring points, up to 3-point perspective, and admit I never use them...

    In my first year in art school, I almost wetted myself when a teacher showed us how to construct a square in perspective, using a bisection of an angle, which does not work, and gives verifiably bad results. On my request for proof or reference, he told me that this is so simple that a proof is not needed, the old Greeks already did it this way. Last time I checked, the school still teaches it this way. I don't mind if things are kept simple, I do revolt when people teach crap.
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    eezacque: I agree with you, I can also show several books (and internet tutorials) where a "perfect" square is explained using several and crap methods. And yes, squares are good in order to misure a figure (aspect ratio)
    When you draw a square you can draw it in several ways but how do you know if it is a perfect square in that perspective?
    Oh, perspective is *science*, think about how computers softwares implement that, I read these books too and I didn't find any solution to this question.
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  16. #26
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    Quote Originally Posted by Anid Maro View Post
    I 'squared' away, so to speak, my earlier mistake but I'm not going to bother any farther, as evidently squares in perspective are some arcane secret to only be answered with "read the fucking manual" and "Look up your own tutorial, don't bother me".

    Not that it's everyone's attitude, but it seems to be the prevailing one.

    So sorry Daafone, I guess go read a book or figure it out or something.
    The prevailing attitude of "RTFM" is mostly because the explanation is 1) lengthy and 2) requires illustrations, and it's understandable that most people won't bother to spend 2 hours writing and illustrating something that can be found out from books.

    And I think that going to read a book is a good idea for you. Your deleted advice wasn't quite right.

    That said... it is a bit of "arcane" knowledge, for some reason. Most books on perspective either omit it, don't mention that the method can be used to build a square of specific size, or make it very challenging to understand.

    I built this demo rather quickly from memory, so double-checks are welcome. I think I did it correctly, but it's rather late in the night, and if I botched it, I'm sorry. It's a modified "architect's method" - real architects start with an elevation plan, and we start from the perspective, so we have to build the elevation plan in correct relationship to the perspective first. Once you pinpoint the elevation plan size and position, then it's the regular trick of diagonals used to locate an unknown point from two known ones.

    You can extend this method to all sorts of precise measurements in perspective.
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