Curve.NormalAtParameter changes results at an angle

Im having trouble understanding why I get a vector pointing in the y direction when its a vertical line and in the x direction when its slightly at an angle. Im working with detail lines in a section view. I would like it to point perpendicular in the y,z direction. Thanks for the help.

You need to create a vector in the direction you want:

Try this:

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Thanks so much. That’s what I needed.

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