Add UI option to import curves and tolerate invalid IfcSite objects

src/ifcblenderexport/io_export_ifc/import_ifc.py

@@ -99,7 +99,8 @@ class IfcImporter():
         self.ifc_import_settings = ifc_import_settings
         self.file = None
         self.settings = ifcopenshell.geom.settings()
-        self.settings.set(self.settings.INCLUDE_CURVES, True)
+        if self.ifc_import_settings.should_import_curves:
+            self.settings.set(self.settings.INCLUDE_CURVES, True)
         self.project = None
         self.spatial_structure_elements = {}
         self.elements = {}
@@ -149,6 +150,9 @@ class IfcImporter():
                 name = self.get_name(element)
                 if name in self.spatial_structure_elements:
                     continue
+                # Occurs when some naughty programs export IFC site objects
+                if not element.Decomposes:
+                    continue
                 parent = element.Decomposes[0].RelatingObject
                 parent_name = self.get_name(parent)
                 if parent.is_a('IfcProject'):
@@ -298,3 +302,4 @@ class IfcImportSettings:
     def __init__(self):
         self.logger = None
         self.input_file = None
+        self.should_import_curves = False

src/ifcblenderexport/io_export_ifc/operator.py

@@ -58,6 +58,7 @@ class ImportIFC(bpy.types.Operator, ImportHelper):
         ifc_import_settings.logger = logging.getLogger('ImportIFC')
         ifc_import_settings.logger.info('Starting import')
         ifc_import_settings.input_file = self.filepath
+        ifc_import_settings.should_import_curves = bpy.context.scene.BIMProperties.import_should_import_curves
         ifc_importer = import_ifc.IfcImporter(ifc_import_settings)
         ifc_importer.execute()
         ifc_import_settings.logger.info('Import finished in {:.2f} seconds'.format(time.time() - start))

src/ifcblenderexport/io_export_ifc/ui.py

@@ -63,6 +63,7 @@ class BIMProperties(bpy.types.PropertyGroup):
     export_has_representations: bpy.props.BoolProperty(name="Export Representations", default=True)
     export_should_export_all_materials_as_styled_items: bpy.props.BoolProperty(name="Export All Materials as Styled Items", default=False)
     export_should_use_presentation_style_assignment: bpy.props.BoolProperty(name="Export with Presentation Style Assignment", default=False)
+    import_should_import_curves: bpy.props.BoolProperty(name="Import Curves", default=False)
     qa_reject_element_reason: bpy.props.StringProperty(name="Element Rejection Reason")
     pset_name: bpy.props.EnumProperty(items=getPsetNames, name="Pset Name")
     pset_file: bpy.props.EnumProperty(items=getPsetFiles, name="Pset File")
@@ -446,3 +447,6 @@ class MVDPanel(bpy.types.Panel):
         row.prop(bim_properties, "export_should_export_all_materials_as_styled_items")
         row = layout.row()
         row.prop(bim_properties, "export_should_use_presentation_style_assignment")
+
+        row = layout.row()
+        row.prop(bim_properties, "import_should_import_curves")