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Math Help - Finding box faces from silhouette

  1. #1
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    Finding box faces from silhouette

    Given a silhouette of a box, how do you mathematically define the lines that would look like the top of a box and two sides?

    In other words, what math rule would tell me in the picture below that the red lines are accurate, and not the blue or green ones?

    Arithmomaniac

    Finding box faces from silhouette-picture-109-.jpg
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  2. #2
    Senior Member
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    Why aren't the green lines accurate? How is the silhouette created (what type of projection is used? Perspective?)?
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  3. #3
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    Perspective.
    I figured out the answer at the end of Friday - the vanishing lines give away the inner vertex. If they point down, you're looking at the box top-down.
    Arithmomaniac
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