Open Studio: Setting North Orientation

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How do we check which axis point is north, though? So I can change the North Axis 90, 180, 270, etc. no problem, but how do we tell where it is established initially?

North is whatever direction in degrees you enter for "North Axis". On the screenshot above absolute or site North is the positive direction on the y axis (the solid green line). In this case I entered 20 for "North Axis" for the building. A positive value rotates Building North counterclockwise.

May I ask for further clarifications? So the true north/real north will always be the direction of the solid green line, the orange line shown in SketchUp is the building north? Whether it means that although building is shown as aligns to the solid green line, in e+ simulation, it is rotated to align with the orange line?
I also find a similar question to this one with different answers, see the link: https://unmethours.com/question/46652...

@Amy Lee the orange line is north. The green line could be called plan north, or just the north for the buildings xyz coordinate system. If you look in comments of other post it clarifies that the orange line and not the green line represent north. If your building rotation field is set to 0, then the orange line doesn't show up at all and there is only the green line. In that situation the green line for plan north also happens to be true north.

Thanks for your clarification. It make sense for building to align with its plan north.