Line direction?

Hi, would just like to understand the below. Why do I have to rotate the line direction 90 to get the perimeter of the bounding box I want? I would assume the lines already going in the right direction to create the plane I need?

There are plenty of other alternatives to create a plane - the cross product of the direction and Z axis vector is also another way of creating a normal

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Because the plane is asking for the normal direction.

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Omg I just clicked. Was a long day of Dyanmo yesterday. Can see it visually in my head now. Thanks!

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