How does G3-PCX (Deb) work?

The thing I don't underestand about this algorithm is the way of calculating orthogonal distance between parents and vector passing through centre of gravity and first parent. and how to find orthogonal vectors (e).

Answer:
G3 is centre of gravity
PCX must be vector
orthogonal distance is the perpendicular distance

question is confusing..i need a diagram to answer
i need to know how vectors are aligned

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