You can now select geometry library in advanced settings

src/bonsai/bonsai/bim/import_ifc.py

@@ -715,9 +715,17 @@ class IfcImporter:
         if not products:
             return results
         if tool.Loader.settings.should_use_cpu_multiprocessing:
-            iterator = ifcopenshell.geom.iterator(settings, self.file, multiprocessing.cpu_count(), include=products)
+            iterator = ifcopenshell.geom.iterator(
+                settings,
+                self.file,
+                multiprocessing.cpu_count(),
+                include=products,
+                geometry_library=self.ifc_import_settings.geometry_library,
+            )
         else:
-            iterator = ifcopenshell.geom.iterator(settings, self.file, include=products)
+            iterator = ifcopenshell.geom.iterator(
+                settings, self.file, include=products, geometry_library=self.ifc_import_settings.geometry_library
+            )
         if self.ifc_import_settings.should_cache:
             cache = IfcStore.get_cache()
             if cache:
@@ -1473,6 +1481,7 @@ class IfcImportSettings:
         self.logger: logging.Logger = None
         self.input_file = None
         self.diff_file = None
+        self.geometry_library = "opencascade"
         self.should_use_cpu_multiprocessing = True
         self.should_merge_materials_by_colour = False
         self.should_load_geometry = True
@@ -1508,6 +1517,7 @@ class IfcImportSettings:
             logger = logging.getLogger("ImportIFC")
         settings.logger = logger
         settings.diff_file = scene_diff.diff_json_file
+        settings.geometry_library = props.geometry_library
         settings.should_use_cpu_multiprocessing = props.should_use_cpu_multiprocessing
         settings.should_merge_materials_by_colour = props.should_merge_materials_by_colour
         settings.should_load_geometry = props.should_load_geometry

src/bonsai/bonsai/bim/module/project/prop.py

@@ -143,6 +143,15 @@ class BIMProjectProperties(PropertyGroup):
     active_filter_category_index: IntProperty(name="Active Filter Category Index")
     filter_query: StringProperty(name="Filter Query")
     should_filter_spatial_elements: BoolProperty(name="Filter Spatial Elements", default=False)
+    geometry_library: bpy.props.EnumProperty(
+        items=[
+            ("opencascade", "OpenCASCADE", "Best for stability and accuracy"),
+            ("cgal", "CGAL", "Best for speed"),
+            ("cgal-simple", "CGAL Simple", "CGAL without booleans"),
+            ("hybrid-cgal-simple-opencascade", "Hybrid CGAL-OCC", "First CGAL then fallback to OCC"),
+        ],
+        name="Geometry Library",
+    )
     should_use_cpu_multiprocessing: BoolProperty(name="CPU Multiprocessing", default=True)
     should_merge_materials_by_colour: BoolProperty(name="Merge Materials by Colour", default=False)
     should_stream: BoolProperty(name="Stream Data From IFC-SPF (Only for advanced users)", default=False)

src/bonsai/bonsai/bim/module/project/ui.py

@@ -175,6 +175,8 @@ class BIM_PT_project(Panel):
         row = self.layout.row()
         row.prop(pprops, "should_merge_materials_by_colour")
         row = self.layout.row()
+        row.prop(pprops, "geometry_library")
+        row = self.layout.row()
         row.prop(pprops, "deflection_tolerance")
         row = self.layout.row()
         row.prop(pprops, "angular_tolerance")