You can now purge unused representations from the purge data panel

src/blenderbim/blenderbim/bim/module/geometry/__init__.py

@@ -37,6 +37,7 @@ classes = (
     operator.OverrideOriginSet,
     operator.OverrideOutlinerDelete,
     operator.OverridePasteBuffer,
+    operator.PurgeUnusedRepresentations,
     operator.RefreshAggregate,
     operator.RemoveConnection,
     operator.RemoveRepresentation,

src/blenderbim/blenderbim/bim/module/geometry/operator.py

@@ -210,6 +210,15 @@ class RemoveRepresentation(bpy.types.Operator, Operator):
         )
 
 
+class PurgeUnusedRepresentations(bpy.types.Operator, Operator):
+    bl_idname = "bim.purge_unused_representations"
+    bl_label = "Purge Unused Representations"
+    bl_options = {"REGISTER", "UNDO"}
+
+    def _execute(self, context):
+        core.purge_unused_representations(tool.Ifc, tool.Geometry)
+
+
 class UpdateRepresentation(bpy.types.Operator, Operator):
     bl_idname = "bim.update_representation"
     bl_label = "Update Representation"

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

@@ -395,3 +395,4 @@ class BIM_PT_purge(Panel):
         layout = self.layout
         layout.operator("bim.purge_unused_profiles")
         layout.operator("bim.purge_unused_types")
+        layout.operator("bim.purge_unused_representations")

src/blenderbim/blenderbim/core/geometry.py

@@ -157,6 +157,12 @@ def remove_representation(ifc, geometry, obj=None, representation=None):
         geometry.delete_data(data)
 
 
+def purge_unused_representations(ifc, geometry):
+    for representation in geometry.get_model_representations():
+        if ifc.get().get_total_inverses(representation) == 0:
+            ifc.run("geometry.remove_representation", representation=representation)
+
+
 def select_connection(geometry, connection=None):
     geometry.select_connection(connection)
 

src/blenderbim/blenderbim/tool/geometry.py

@@ -204,7 +204,7 @@ class Geometry(blenderbim.core.tool.Geometry):
                 direction = Vector((0, 1, 0))
             depsgraph = bpy.context.evaluated_depsgraph_get()
             visible_faces = []
-            face_offset = obj.matrix_world.to_quaternion() @ Vector((0,0,distance))
+            face_offset = obj.matrix_world.to_quaternion() @ Vector((0, 0, distance))
             global_direction = obj.matrix_world.to_quaternion() @ direction
             for face in bm.faces:
                 if direction.dot(face.normal) > 0:
@@ -215,7 +215,9 @@ class Geometry(blenderbim.core.tool.Geometry):
                     centroid = face.calc_center_median()
                     face_centroid_at_max = Vector((centroid.x, min_y, centroid.z))
                 face_centroid_at_max = obj.matrix_world @ face_centroid_at_max
-                hit, loc, norm, idx, o, mw = bpy.context.scene.ray_cast(depsgraph, face_centroid_at_max, global_direction, distance=distance)
+                hit, loc, norm, idx, o, mw = bpy.context.scene.ray_cast(
+                    depsgraph, face_centroid_at_max, global_direction, distance=distance
+                )
                 if o != obj or idx == face.index:
                     visible_faces.append(face)
             return visible_faces
@@ -617,3 +619,7 @@ class Geometry(blenderbim.core.tool.Geometry):
     @classmethod
     def should_use_presentation_style_assignment(cls):
         return bpy.context.scene.BIMGeometryProperties.should_use_presentation_style_assignment
+
+    @classmethod
+    def get_model_representations(cls):
+        return tool.Ifc.get().by_type("IfcShapeRepresentation")