Arch: import IFC, get back description of empty relation tables

src/Mod/Arch/importIFC.py

@@ -290,14 +290,22 @@ def insert(filename,docname,skip=[],only=[],root=None):
         settings.set(settings.APPLY_LAYERSETS,True)
 
     # build all needed tables
-    if DEBUG: print("Building relationships table...",end="")
-    objects, shapes, structshapes, sharedobjects, parametrics, profiles = {}, {}, {}, {}, {}, {}
+    if DEBUG: print("Building types and relationships table...",end="")
+    # type tables
     sites = ifcfile.by_type("IfcSite")
     buildings = ifcfile.by_type("IfcBuilding")
     floors = ifcfile.by_type("IfcBuildingStorey")
     openings = ifcfile.by_type("IfcOpeningElement")
     materials = ifcfile.by_type("IfcMaterial")
     products, annotations = importIFCHelper.buildRelProductsAnnotations(ifcfile, ROOT_ELEMENT)
+    # empty relation tables
+    objects = {} # { id:object, ... }
+    shapes = {} # { id:shaoe } only used for merge mode
+    structshapes = {} # { id:shaoe } only used for merge mode
+    sharedobjects = {} # { representationmapid:object }
+    parametrics = [] # a list of imported objects whose parametric relationships need processing after all objects have been created
+    profiles = {} # to store reused extrusion profiles {ifcid:fcobj,...}
+    # filled relation tables
     # TODO for the following tables might be better use inverse attributes, done for properties
     # see https://forum.freecadweb.org/viewtopic.php?f=39&t=37892
     prodrepr = importIFCHelper.buildRelProductRepresentation(ifcfile)

src/Mod/Arch/importIFCHelper.py

@@ -77,7 +77,7 @@ class ProjectImporter:
         return round(math.degrees(math.atan2(y, x)) - 90, 6)
 
 
-# relation tables
+# type tables
 def buildRelProductsAnnotations(ifcfile, root_element):
     """build the products and annotations relation table and"""
 
@@ -99,6 +99,7 @@ def buildRelProductsAnnotations(ifcfile, root_element):
     return products, annotations
 
 
+# relation tables
 def buildRelProductRepresentation(ifcfile):
     """build the product/representations relation table"""