Store generated GlobalId values for parametric geometry

src/ifcblenderexport/io_export_ifc/__init__.py

@@ -58,6 +58,7 @@ classes = (
     ui.Pset,
     ui.Document,
     ui.Classification,
+    ui.GlobalId,
     ui.BIMObjectProperties,
     ui.BIMMaterialProperties,
     ui.BIMMeshProperties,

src/ifcblenderexport/io_export_ifc/export_ifc.py

@@ -212,16 +212,26 @@ class IfcParser():
     def resolve_array_modifier(self, product):
         object = product['raw']
         instance_objects = [(object, object.location)]
+        global_id_index = 0
         for instance in self.get_instances(object):
             created_instances = []
             for n in range(instance.count-1):
                 for o in instance_objects:
                     location = o[1] + ((n+1) * instance.offset)
                     self.add_product(self.get_product({ 'raw': o[0], 'metadata': product['metadata'] },
-                        {'location': location}, {'GlobalId': ifcopenshell.guid.new()}))
+                        {'location': location}, {'GlobalId': self.get_parametric_global_id(object, global_id_index)}))
                     created_instances.append((o[0], location))
             instance_objects.extend(created_instances)
 
+    def get_parametric_global_id(self, object, index):
+        global_ids = object.BIMObjectProperties.global_ids
+        total_global_ids = len(global_ids)
+        if index < total_global_ids:
+            return global_ids[index].name
+        global_id = object.BIMObjectProperties.global_ids.add()
+        global_id.name = ifcopenshell.guid.new()
+        return global_id.name
+
     def add_product(self, product):
         self.products.append(product)
         self.product_name_index_map[product['raw'].name] = self.product_index

src/ifcblenderexport/io_export_ifc/ui.py

@@ -112,6 +112,9 @@ class Classification(bpy.types.PropertyGroup):
     name: bpy.props.StringProperty(name="Name")
     identification: bpy.props.StringProperty(name="Identification")
 
+class GlobalId(bpy.types.PropertyGroup):
+    name: bpy.props.StringProperty(name="Name")
+
 class BIMObjectProperties(bpy.types.PropertyGroup):
     def getApplicableAttributes(self, context):
         if '/' in bpy.context.active_object.name \
@@ -129,6 +132,7 @@ class BIMObjectProperties(bpy.types.PropertyGroup):
             results.append((uri, uri, ''))
         return results
 
+    global_ids: bpy.props.CollectionProperty(name="GlobalIds", type=GlobalId)
     attributes: bpy.props.CollectionProperty(name="Attributes", type=Attribute)
     psets: bpy.props.CollectionProperty(name="Psets", type=Pset)
     applicable_attributes: bpy.props.EnumProperty(items=getApplicableAttributes, name="Attribute Names")