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Calculating vanishing points with Linear Algebra.

  1. Jul 13, 2010 #1
    I'm trying to calculate the vanishing lines of a picture of a box.
    I get that you represent the x,y positions of the vertices as [x, y, 1].
    But what does it mean that you obtain a supporting line [a, b, c] with the cross-product of two vertices? What do a, b, and c represent, and what does the cross-multiplying represent?
    And how does cross-multiplying two supporting lines return the vanishing point in 3D?

    I'm trying to implement http://www.inf.ufrgs.br/~laffernandes/fernandes_et_al_JBCS_v12_n2.pdf" [Broken] on images of a box, with [x, y, 1] being pixels, and I'm doing the above steps to obtain the vanishing lines of each face of the box.

    Last edited by a moderator: May 4, 2017
  2. jcsd
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