Outward vector of roof

[Arno_De_Lange]

It is still my testcase house found here:

3D Print from Revit

i want to generate that inplace family automaticly… doesn’ t need to be an inplace family but i need the mass so could also be saved as a family

It is to get the North south west east orientation…as seen in the last node of the script.

but a Z-vector perpendicular to the surface would solve it, but how to know that the Z is pointing up not down.

Arno