New IFCPatch tool, which can "patch" an IFC, including adjusting coordinates and elevations.

src/ifcpatch/recipes/OffsetStoreyElevations.py

@@ -0,0 +1,29 @@
+class Patcher:
+    def __init__(self, file, logger, args=None):
+        self.file = file
+        self.logger = logger
+        self.args = args
+
+    def patch(self):
+        project = self.file.by_type('IfcProject')[0]
+        storeys = self.find_decomposed_ifc_class(project, 'IfcBuildingStorey')
+        for storey in storeys:
+            co = storey.ObjectPlacement.RelativePlacement.Location.Coordinates
+            storey.ObjectPlacement.RelativePlacement.Location.Coordinates = (co[0], co[1], co[2]+float(self.args[0]))
+            co = storey.ObjectPlacement.RelativePlacement.Location.Coordinates
+            # NOTE  If the geometric data is provided (ObjectPlacement is
+            # specified), the Elevation value shall either not be included, or
+            # be equal to the local placement Z value.
+            storey.Elevation = co[2]
+
+    def find_decomposed_ifc_class(self, element, ifc_class):
+        results = []
+        rel_aggregates = element.IsDecomposedBy
+        if not rel_aggregates:
+            return results
+        for rel_aggregate in rel_aggregates:
+            for part in rel_aggregate.RelatedObjects:
+                if part.is_a(ifc_class):
+                    results.append(part)
+                results.extend(self.find_decomposed_ifc_class(part, ifc_class))
+        return results