Thread: The distance of an object.

  1. #1
    Registered User Queatrix's Avatar
    Join Date
    Apr 2005

    The distance of an object.

    Say I have this object that at 1 mile away, is 100 pixles wide. How many pixles is it at 2 mile wide?

    I am probably asking a simple question, but I have no idea how size/distance is figured.

  2. #2
    Lurking whiteflags's Avatar
    Join Date
    Apr 2006
    United States
    I imagine you can do this the same way cartographers plot cities on a map. Just put everything to scale. This is a proportion question. Do you remember how to solve those?

  3. #3
    Registered User
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    Sep 2001
    At 2 miles, it will be 50 pixels.
    Callou collei we'll code the way
    Of prime numbers and pings!

  4. #4
    Registered User
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    May 2003
    Unless my math is wrong, if you think about the "camera" being a single point, because of different ways to express the tangent of the angle,

    w1/d1 = w0/d0
    You ever try a pink golf ball, Wally? Why, the wind shear on a pink ball alone can take the head clean off a 90 pound midget at 300 yards.

  5. #5
    Registered User
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    May 2006
    You don't need to worry about tangents of angles -- because computer screens are flat, you want to think about how the rays of light are laid out as they pass through a plane in front of the camera.

    w1*d1 = w0*d0 is the relationship to use.

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