How to find out building orientation?

Grasshopper
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2

Hello
your question is not very clear, what is your definition of the main direction of the building ?
perhaps you could use oriented Bounding Box to have the main axes of your building.

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If you have a definition for this direction, then Azimuth will be simple to calculate knowing with vector is North. Usually North is Y vector. And you must must use XY plane as Plane angle.

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Vector A and B are “flipped” because Azimuth is clockwize when looking from above and XY plane Z direction is going counter clockwise.

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