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  1. #1
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    How do I measure lines in perspective?

    Let's imagine that I want to draw a cube in perspective (1, 2, 3 point - doesn't matter) - how do I measure the lines to make sure each of them is equally long? Is there some sort of technique that you use to measure the length?

    I've tried doing it by feeling but the results are unsatisfactory.


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  3. #2
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    Can we see these results?
    Maybe we can see what exactly you are having problems with.

  4. #3
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    http://postimg.org/image/vyd3vacij/

    How do I make sure x, y and z are all the exact same length?

  5. #4
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    Study 'measuring points' from one of the standard manuals on perspective.
    Grinnikend door het leven...

    Sketchbook Blog

  6. #5
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    Could you be more specific? Any sources you'd like to suggest?

  7. #6
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    Norling: Perspective Made Easy - p. 200 onward
    Loomis: Successful Drawing - p. 40 onward

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  9. #7
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    Thanks! I've just gone briefly over the Loomis book and I'm guessing you're talking about the "architect method"? The equal spacing seems only relevant for a single direction...

  10. #8
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    Yes, look up "architect's method" of building perspective. If you want a book, Norling's "Perspective Made Easy" has a tutorial; Loomis's is not as good on this matter.

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  12. #9
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    Okay, so I've tried the architect method and I just can't seem to get it right. Could somebody please draw a cube with it and post it so that I can see what I'm doing wrong?
    Also, is the GL = (HL - PP) / 2?

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    Name:  cube_construction.jpg
Views: 600
Size:  95.1 KB

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  15. #11
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    Note that this does not apply to 3-pt perspective...
    Grinnikend door het leven...

    Sketchbook Blog

  16. #12
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    Here are step-by-step instructions on how to set up a measuring system in 3pt perspective, let alone how to draw a cube in 3pp:

    http://handprint.com/HP/WCL/perspect4.html

    But, if you don’t have a strong enough grasp of perspective, 1 and 2 pt, that will only confuse the hell out of you.
    I suggest clicking on the spiral drops icon to start at the beginning and read through the material carefully, multiple times if necessary, and draft every diagram until it all sinks in.
    Everything you’ll need to know about linear perspective drawing is right there:

    http://handprint.com/HP/WCL/tech10.html#index

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  18. #13
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    Thanks for all the info!

    I've realized that the reason my cube wasn't turning out right was because I wasn't using any perspective at all (I'm such a dumbass...) but just fudging it. The architect method, even after LaCan's generous efforts STILL turns out wild results so I decided to just go with good old 2PP and fudge the corners. Surprisingly, it works adequately and more importantly, takes less time than the AM. Not only that, but I also discovered a nice way to quickly fudge the dimensions, if anyone is interested I'll be happy to post it.

  19. #14
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    Quote Originally Posted by l33t fl33t View Post
    Not only that, but I also discovered a nice way to quickly fudge the dimensions, if anyone is interested I'll be happy to post it.
    I'm always willing to learn, so I am interested! One word of caveat: fudging a cube might be doable, but if you're fudging multiple objects in space, this space might start falling apart real easily. So, each chair and table might look correctly fudged, but they can never coexist in the same room. The Architect's Method is an investment, it may take some practice to get it, and people here are generally helpful enough to help you out, but in the end, it really pays! This is even more the case for setting up measure points for 2-pt and 3-pt perspective...
    Grinnikend door het leven...

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  20. #15
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    Now that I've actually gotten around to making it, the technique seems kind of silly but still, if it helps somebody...

    http://postimg.org/image/901irj2pz/

    http://postimg.org/image/5hpiv51tz/

    So, you just take your regular old 2PP and draw a vertical line and after that, rather than going draw/erase/repeat until you get the other lines right, you just draw two lines towards a PP on a separate layer and use the select tool to delete the parts you don't need. If you make a mistake (erase too little or too much), just undo and move the selection until you get it right.

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