Getting data from imported window geometry

Question

I have imported windows from a CAD-tool (Revit) including framing that are almost planar rectangular meshes and I need to write some key metrics to a textfile for each window. The data I need is midpoint, width, height and normal direction for each window. Normal direction could be inverted and height is determined by Z-axes (the lower part of the window is allways is the X-Y plane). I am thinking of creating a bounding box to get midpoint and width but that does not take me all the way.

A file with a few examples of windows from Revit can be found at https://github.com/maxtillberg/BlenderICE/blob/main/windows.blend Note that this includes a non rectangular window that should (if possible) be treated like a rectangular and one wndow have separate window panes and are actually two meshes (sigh).

This is what I got

import bpy from mathutils import Vector

selected = bpy.context.selected_objects

for obj in selected:
    #ensure origin is centered on bounding box center
    bpy.ops.object.origin_set(type='ORIGIN_GEOMETRY', center='BOUNDS')
    #create a cube for the bounding box
    bpy.ops.mesh.primitive_cube_add() 
    #our new cube is now the active object, so we can keep track of it in a variable:
    bound_box = bpy.context.active_object 

    #copy transforms
    bound_box.dimensions = obj.dimensions
    bound_box.location = obj.location
    bound_box.rotation_euler = obj.rotation_euler
    print (obj.location)
    print (obj.dimensions)
    centre = sum((Vector(b) for b in bound_box.bound_box), Vector())
    centre /= 8
    print(centre)

Answer 1

Hard to suggest something without seeing the actual data, but I would try something like this:

import bpy
from bpy import context as C

for ob in C.selected_objects:
    #ensure origin is centered on bounding box center
    bpy.ops.object.origin_set(type='ORIGIN_GEOMETRY', center='BOUNDS')
    centre = 0  # doesn't it achieve what you do?
    faces_up = (p for p in ob.data.polygons if p.normal.z > 0)
    normal = max(faces_up, key=lambda f: f.area).normal
    verts = ob.data.vertices
    width = max(v.co.x for v in verts) - min(v.co.x for v in verts) 
    height = max(v.co.z for v in verts) - min(v.co.z for v in verts)
    print(f"\n--\n{ob.name}:\n{centre=}\n{normal=}\n{width=}\n{height=}")