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What is the value of perspective in number ?

  1. Sep 17, 2011 #1
    Hi!
    I wanna know, the value of perspective in exact number.
    Like how much is the angular convergence between two points


    A. Camera ----------------------------------------------------------- Building B.


    In the above how much would building converge, and what would be the size, when viewed at point A.

    Thanks
    V.
     
  2. jcsd
  3. Sep 17, 2011 #2

    HallsofIvy

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    Your question is much too vague. Your object has to have some size in order to subtend an angle. If building B has height h, and the distance from camera A is x, then the angle between the base of B and top of B, as seen from camera A, is arctan(h/x). Is that what you are asking?
     
  4. Sep 18, 2011 #3
    Thanks,
    So, you mean it would change as per the distance between eye(camera) and the view(building) ?

    But what is the answer, if i replace the building with horizon ? How would i know the distance of horizon from my eye ?

    Nevermind.. got it here :
    http://en.wikipedia.org/wiki/Horizon

    Thanks.
     
    Last edited: Sep 18, 2011
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