You can now set facet tolerances (angular and deflection tolerance) when importing. See #766.

src/ifcblenderexport/blenderbim/bim/import_ifc.py

@@ -251,6 +251,9 @@ class IfcImporter():
         self.diff = None
         self.file = None
         self.settings = ifcopenshell.geom.settings()
+        self.settings.set_deflection_tolerance(self.ifc_import_settings.deflection_tolerance)
+        # Uncomment this when the latest IfcOpenBot build is ready
+        # self.settings.set_angular_tolerance(self.ifc_import_settings.angular_tolerance)
         if self.ifc_import_settings.should_import_curves:
             self.settings.set(self.settings.INCLUDE_CURVES, True)
         self.settings_native = ifcopenshell.geom.settings()
@@ -2066,4 +2069,6 @@ class IfcImportSettings:
         settings.should_merge_by_material = scene_bim.import_should_merge_by_material
         settings.should_merge_materials_by_colour = scene_bim.import_should_merge_materials_by_colour
         settings.should_clean_mesh = scene_bim.import_should_clean_mesh
+        settings.deflection_tolerance = scene_bim.import_deflection_tolerance
+        settings.angular_tolerance = scene_bim.import_angular_tolerance
         return settings

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -1215,6 +1215,8 @@ class BIMProperties(PropertyGroup):
     import_should_merge_by_material: BoolProperty(name="Import and Merge by Material", default=False)
     import_should_merge_materials_by_colour: BoolProperty(name="Import and Merge Materials by Colour", default=False)
     import_should_clean_mesh: BoolProperty(name="Import and Clean Mesh", default=True)
+    import_deflection_tolerance: FloatProperty(name="Import Deflection Tolerance", default=0.001)
+    import_angular_tolerance: FloatProperty(name="Import Angular Tolerance", default=0.5)
     qa_reject_element_reason: StringProperty(name="Element Rejection Reason")
     person: EnumProperty(items=getPersons, name="Person")
     organisation: EnumProperty(items=getOrganisations, name="Organisation")

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -1700,6 +1700,10 @@ class BIM_PT_mvd(Panel):
         row = layout.row()
         row.prop(bim_properties, 'import_should_import_with_profiling')
         row = layout.row()
+        row.prop(bim_properties, 'import_deflection_tolerance')
+        row = layout.row()
+        row.prop(bim_properties, 'import_angular_tolerance')
+        row = layout.row()
         row.prop(bim_properties, 'export_json_compact')
 
         layout.label(text='Simplifications:')