#2224 Cache seems unstable for some large models so allow option to disable

src/blenderbim/blenderbim/bim/import_ifc.py

@@ -683,9 +683,10 @@ class IfcImporter:
             )
         else:
             iterator = ifcopenshell.geom.iterator(self.settings, self.file, include=products)
-        cache = IfcStore.get_cache()
-        if cache:
-            iterator.set_cache(cache)
+        if self.ifc_import_settings.should_cache:
+            cache = IfcStore.get_cache()
+            if cache:
+                iterator.set_cache(cache)
         valid_file = iterator.initialize()
         if not valid_file:
             return results
@@ -832,9 +833,10 @@ class IfcImporter:
             )
         else:
             iterator = ifcopenshell.geom.iterator(self.settings_2d, self.file, include=products)
-        cache = IfcStore.get_cache()
-        if cache:
-            iterator.set_cache(cache)
+        if self.ifc_import_settings.should_cache:
+            cache = IfcStore.get_cache()
+            if cache:
+                iterator.set_cache(cache)
         valid_file = iterator.initialize()
         if not valid_file:
             return results
@@ -1925,6 +1927,7 @@ class IfcImportSettings:
         self.should_merge_materials_by_colour = False
         self.should_use_native_meshes = False
         self.should_clean_mesh = True
+        self.should_cache = True
         self.deflection_tolerance = 0.001
         self.angular_tolerance = 0.5
         self.distance_limit = 1000
@@ -1953,6 +1956,7 @@ class IfcImportSettings:
         settings.should_merge_materials_by_colour = props.should_merge_materials_by_colour
         settings.should_use_native_meshes = props.should_use_native_meshes
         settings.should_clean_mesh = props.should_clean_mesh
+        settings.should_cache = props.should_cache
         settings.deflection_tolerance = props.deflection_tolerance
         settings.angular_tolerance = props.angular_tolerance
         settings.distance_limit = props.distance_limit

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

@@ -141,6 +141,7 @@ class BIMProjectProperties(PropertyGroup):
     should_merge_materials_by_colour: BoolProperty(name="Import and Merge Materials by Colour", default=False)
     should_clean_mesh: BoolProperty(name="Import and Clean Mesh", default=True)
     should_use_native_meshes: BoolProperty(name="Native Meshes", default=False)
+    should_cache: BoolProperty(name="Cache", default=False)
     deflection_tolerance: FloatProperty(name="Deflection Tolerance", default=0.001)
     angular_tolerance: FloatProperty(name="Angular Tolerance", default=0.5)
     distance_limit: FloatProperty(name="Distance Limit", default=1000)

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

@@ -76,6 +76,7 @@ class BIM_PT_project(Panel):
         row = self.layout.row()
         row.prop(pprops, "should_merge_by_class")
         row = self.layout.row()
+        row.prop(pprops, "should_cache")
         row.prop(pprops, "should_merge_by_material")
         row = self.layout.row()
         row.prop(pprops, "should_use_native_meshes")