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Math Help - Projecting/transforming 3d cartesian coordinates to a 2d plane?

  1. #1
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    Projecting/transforming 3d cartesian coordinates to a 2d plane?

    Hi

    I have a 3-d software package that can spit out x, y, z coordinates to a csv file. At the moment in order to get a drawing out I put all the objects as close to the x z plane as possible and simply delete the y values. What I want to be able to do is define a plane for a drawing and project/transform the 3-d values to 2-d values on that plane?

    I'm guessing this must be how a graphics card renders its images and so there must be text book answer but I can't find it! Can any one shed any light?

    Ian
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  2. #2
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    I was actually employed to work on this exact problem over ten years ago: before such 3D packages etc. were commercially available.
    I'm afraid I cant tell you the equations- it was too long ago. And yes, it sounds like it should be text book but it wasn't when I worked on it.
    Sorry I'm not much help- all I suggest is that you look up Affine Transformations.
    The projective equations are actually quite simple, but rendering of the graphics is more of an art form.
    Last edited by mr fantastic; December 25th 2010 at 07:13 PM. Reason: Restored deleted post. User banned.
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