diff --git a/src/blenderbim/blenderbim/core/tool.py b/src/blenderbim/blenderbim/core/tool.py
index fe1d651bee..54bc12d513 100644
--- a/src/blenderbim/blenderbim/core/tool.py
+++ b/src/blenderbim/blenderbim/core/tool.py
@@ -153,6 +153,17 @@ class Bsdd:
     def should_load_preview_domains(cls): pass
 
 
+@interface
+class Clash:
+    def export_clash_sets(cls): pass
+    def get_clash(cls, clash_set, a_global_id, b_global_id): pass
+    def get_clash_set(cls, name): pass
+    def get_clash_sets(cls): pass
+    def import_active_clashes(cls): pass
+    def load_clash_sets(cls, fn): pass
+    def look_at(cls, target, location): pass
+
+
 @interface
 class Collector:
     def assign(cls, obj): pass
diff --git a/src/blenderbim/blenderbim/tool/__init__.py b/src/blenderbim/blenderbim/tool/__init__.py
index 4f98a7b5e3..80ea55419f 100644
--- a/src/blenderbim/blenderbim/tool/__init__.py
+++ b/src/blenderbim/blenderbim/tool/__init__.py
@@ -22,6 +22,7 @@ from blenderbim.tool.boundary import Boundary
 from blenderbim.tool.brick import Brick
 from blenderbim.tool.bsdd import Bsdd
 from blenderbim.tool.cad import Cad
+from blenderbim.tool.clash import Clash
 from blenderbim.tool.collector import Collector
 from blenderbim.tool.context import Context
 from blenderbim.tool.debug import Debug
diff --git a/src/ifcclash/ifcclash/ifcclash.py b/src/ifcclash/ifcclash/ifcclash.py
index b66fe7689d..d5c16413db 100644
--- a/src/ifcclash/ifcclash/ifcclash.py
+++ b/src/ifcclash/ifcclash/ifcclash.py
@@ -135,8 +135,7 @@ class Clasher:
         self.logger.info(f"Adding objects {name}")
         assert iterator.initialize()
         while True:
-            self.tree.add_element(iterator.get_native(), should_triangulate=True)
-            # self.tree.add_element(iterator.get())
+            self.tree.add_element(iterator.get())
             shape = iterator.get()
             if not iterator.next():
                 break