fix orientation problem on levels with no stairs

src/c3nav/mapdata/models/geometry/level.py

@@ -11,6 +11,7 @@ from scipy.sparse.csgraph._shortest_path import dijkstra
 from shapely import prepared
 from shapely.affinity import scale
 from shapely.geometry import JOIN_STYLE, LineString, MultiPolygon
+from shapely.geometry.polygon import orient
 from shapely.ops import unary_union
 
 from c3nav.mapdata.cache import changed_geometries
@@ -165,7 +166,8 @@ class AltitudeArea(LevelGeometryMixin, models.Model):
                                 tuple(o.buffered_geometry for o in space.lineobstacles.all()) +
                                 tuple(h.geometry for h in space.holes.all()))
                 ))
-            areas = unary_union(areas+list(door.geometry for door in level.doors.all()))
+
+            areas = orient(unary_union(areas+list(door.geometry for door in level.doors.all())))
 
             # collect all stairs on this level
             for space in level.spaces.all():

src/c3nav/mapdata/utils/geometry.py

@@ -266,7 +266,6 @@ def cut_polygon_with_line(polygon: Polygon, line: LineString):
 
 
 def clean_cut_polygon(polygon: Polygon) -> Polygon:
-    polygon = orient(polygon)
     interiors = []
     interiors.extend(cut_ring(polygon.exterior))
     exteriors = [(i, ring) for (i, ring) in enumerate(interiors) if ring.is_ccw]