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  "Title": "Estimate 3D Orientations from 2D Landmarks",
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    "Rz",
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      "page": "conventions",
      "title": "Plot angle conventions",
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      "title": "Convert degrees to radians, and vice versa",
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        "rad2deg"
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        "find.3d",
        "find.pitch",
        "find.yaw"
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      "title": "Calculate a projected 2D vector from two landmarks",
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