See #5972. You can now load a hierarchy to visualise the boolean result tree.

src/bonsai/bonsai/bim/module/void/__init__.py

@@ -22,19 +22,26 @@ from . import ui, prop, operator
 classes = (
     operator.AddFilling,
     operator.AddOpening,
+    operator.BooleansMarkAsManual,
+    operator.DisableEditingBooleans,
+    operator.EnableEditingBooleans,
     operator.RemoveFilling,
     operator.RemoveOpening,
     operator.SelectDecomposition,
-    operator.BooleansMarkAsManual,
+    prop.Boolean,
     prop.VoidProperties,
+    prop.BIMBooleanProperties,
     ui.BIM_PT_voids,
     ui.BIM_PT_booleans,
+    ui.BIM_UL_booleans,
 )
 
 
 def register():
     bpy.types.Scene.VoidProperties = bpy.props.PointerProperty(type=prop.VoidProperties)
+    bpy.types.Scene.BIMBooleanProperties = bpy.props.PointerProperty(type=prop.BIMBooleanProperties)
 
 
 def unregister():
     del bpy.types.Scene.VoidProperties
+    del bpy.types.Scene.BIMBooleanProperties

src/bonsai/bonsai/bim/module/void/data.py

@@ -80,7 +80,7 @@ class BooleansData:
 
     @classmethod
     def booleans(cls):
-        obj = bpy.context.active_object
+        obj = bpy.context.scene.BIMGeometryProperties.representation_obj or bpy.context.active_object
         if (
             not obj.data
             or not hasattr(obj.data, "BIMMeshProperties")
@@ -93,7 +93,7 @@ class BooleansData:
 
     @classmethod
     def manual_booleans(cls):
-        obj = bpy.context.active_object
+        obj = bpy.context.scene.BIMGeometryProperties.representation_obj or bpy.context.active_object
         if (
             not obj.data
             or not hasattr(obj.data, "BIMMeshProperties")

src/bonsai/bonsai/bim/module/void/operator.py

@@ -295,4 +295,50 @@ class BooleansMarkAsManual(bpy.types.Operator, tool.Ifc.Operator):
             {"INFO"}, f"{len(booleans)} booleans were marked as {'manual' if self.mark_as_manual else 'automatic'}"
         )
         bonsai.bim.handler.refresh_ui_data()
+
+
+class EnableEditingBooleans(bpy.types.Operator):
+    bl_idname = "bim.enable_editing_booleans"
+    bl_label = "Enable Editing Booleans"
+    bl_options = {"REGISTER", "UNDO"}
+    bl_description = "Manage a hierarchy of boolean operations"
+
+    @classmethod
+    def poll(cls, context):
+        return bpy.context.scene.BIMGeometryProperties.representation_obj
+
+    def execute(self, context):
+        props = context.scene.BIMBooleanProperties
+        rep_obj = bpy.context.scene.BIMGeometryProperties.representation_obj
+        representation = tool.Geometry.get_active_representation(rep_obj)
+        representation = ifcopenshell.util.representation.resolve_representation(representation)
+        props.booleans.clear()
+
+        def load_boolean(item, level=0):
+            new = props.booleans.add()
+            new.name = f"{item.is_a()}/{item.id()}"
+            new.ifc_definition_id = item.id()
+            new.level = level
+            if item.is_a("IfcBooleanResult"):
+                new.name += f"/{item.Operator}"
+                new.operator = item.Operator
+                load_boolean(item.FirstOperand, level + 1)
+                load_boolean(item.SecondOperand, level + 1)
+
+        for item in representation.Items:
+            if item.is_a("IfcBooleanResult"):
+                load_boolean(item)
+
+        props.is_editing = True
+        return {"FINISHED"}
+
+
+class DisableEditingBooleans(bpy.types.Operator):
+    bl_idname = "bim.disable_editing_booleans"
+    bl_label = "Disable Editing Booleans"
+    bl_options = {"REGISTER", "UNDO"}
+
+    def execute(self, context):
+        props = context.scene.BIMBooleanProperties
+        props.is_editing = False
         return {"FINISHED"}

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

@@ -18,8 +18,21 @@
 
 import bpy
 from bpy.types import PropertyGroup
-from bpy.props import PointerProperty
+from bpy.props import PointerProperty, StringProperty, IntProperty, BoolProperty, CollectionProperty
+
+
+class Boolean(PropertyGroup):
+    name: StringProperty(name="Name")
+    operator: StringProperty(name="Operator")
+    ifc_definition_id: IntProperty(name="IFC Definition ID")
+    level: IntProperty(name="Level")
 
 
 class VoidProperties(PropertyGroup):
     desired_opening: PointerProperty(name="Desired Opening To Fill", type=bpy.types.Object)
+
+
+class BIMBooleanProperties(PropertyGroup):
+    is_editing: BoolProperty(name="Is Editing", default=False)
+    booleans: CollectionProperty(name="Booleans", type=Boolean)
+    active_boolean_index: IntProperty(name="Active Boolean Index")

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

@@ -18,7 +18,7 @@
 
 import bpy
 import bonsai.tool as tool
-from bpy.types import Panel
+from bpy.types import Panel, UIList
 from bonsai.bim.module.void.data import BooleansData, VoidsData
 
 
@@ -110,19 +110,18 @@ class BIM_PT_booleans(Panel):
         if not context.active_object.data:
             return
         layout = self.layout
-        props = context.active_object.data.BIMMeshProperties
+        props = context.scene.BIMBooleanProperties
 
         if context.active_object.data.BIMMeshProperties.ifc_definition_id:
             row = layout.row(align=True)
             total_booleans = BooleansData.data["total_booleans"]
             manual_booleans = BooleansData.data["manual_booleans"]
             row.label(text=f"{len(total_booleans)} Booleans Found ({len(manual_booleans)} Manual)")
+            if props.is_editing:
+                row.operator("bim.disable_editing_booleans", icon="CANCEL", text="")
+            else:
+                row.operator("bim.enable_editing_booleans", icon="IMPORT", text="")
             row.operator("bim.add_boolean", text="", icon="ADD")
-            show_boolean_button = row.row(align=True)
-            show_boolean_button.operator("bim.show_booleans", text="", icon="HIDE_OFF")
-            show_boolean_button.enabled = len(total_booleans) > 0
-            row.operator("bim.hide_booleans", text="", icon="HIDE_ON")
-
             booleans_are_manual = len(manual_booleans) == len(total_booleans)
             op = row.operator(
                 "bim.booleans_mark_as_manual", text="", icon="PINNED" if booleans_are_manual else "UNPINNED"
@@ -136,6 +135,26 @@ class BIM_PT_booleans(Panel):
             row.label(text=upsteam_obj.name)
             row.operator("bim.select_entity", text="", icon="RESTRICT_SELECT_OFF").ifc_id = upstream_obj_ifc_id
 
+        if not props.is_editing:
+            return
+
+        self.layout.template_list("BIM_UL_booleans", "", props, "booleans", props, "active_boolean_index")
+
+
+class BIM_UL_booleans(UIList):
+    def draw_item(self, context, layout, data, item, icon, active_data, active_propname):
+        if item:
+            if item.operator == "DIFFERENCE":
+                icon = "SELECT_DIFFERENCE"
+            elif item.operator == "INTERSECTION":
+                icon = "SELECT_INTERSECT"
+            elif item.operator == "UNION":
+                icon = "SELECT_EXTEND"
+            elif "IfcHalfSpaceSolid" in item.name:
+                icon = "NORMALS_FACE"
+            else:
+                icon = "MESH_DATA"
             row = layout.row(align=True)
-            row.operator("bim.hide_booleans", text="Hide Boolean")
+            for i in range(0, item.level):
-            row.operator("bim.remove_booleans", text="Remove Boolean", icon="X")
+                row.label(text="", icon="BLANK1")
+            row.label(text=item.name, icon=icon)