Orientation relative north

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Hello

I've used OS sketchup plugin to define building layout, according to image bellow

C:\fakepath\Building.jpg.

On OS inspector object Direction of relative north has -0 value.

Being North on the Green axis (Y) and East on the Red axis (X), a value of -0 for relative North, as I see it, this is rotating the building by 180º.

This assumption is based on simulation loads, which should be higher for West oriented spaces, and returned values from the runs, are telling me otherwise.

Any ideas?

Thankyou