first stab

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

@@ -66,6 +66,7 @@ classes = (
     ui.BIM_PT_materials,
     ui.BIM_PT_object_material,
     ui.BIM_UL_materials,
+    ui.BIM_MT_material_context_menu
 )
 
 

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

@@ -62,6 +62,14 @@ class SelectByMaterial(bpy.types.Operator):
     bl_options = {"REGISTER", "UNDO"}
     material: bpy.props.IntProperty()
 
+    def invoke(self, context, event):
+        if event.type == 'RIGHTMOUSE':  
+            if not hasattr(context.scene, "select_by_material_id"):
+                context.scene["select_by_material_id"] = self.material
+            bpy.ops.wm.call_menu(name="BIM_MT_material_context_menu")
+            return {"CANCELLED"}  # Don't run execute()
+        return self.execute(context)
+
     def execute(self, context):
         material = tool.Ifc.get().by_id(self.material)
         core.select_by_material(tool.Material, tool.Spatial, material=material)

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

@@ -20,7 +20,7 @@ from __future__ import annotations
 import bonsai.bim.helper
 import bonsai.tool as tool
 import bpy
-from bpy.types import Panel, UIList
+from bpy.types import Panel, UIList, Operator, Menu
 from bonsai.bim.helper import draw_attributes
 from bonsai.bim.helper import prop_with_search
 from bonsai.bim.module.material.data import MaterialsData, ObjectMaterialData
@@ -374,6 +374,9 @@ class BIM_PT_object_material(Panel):
 
         self.layerset_bounds(box, active_object, location="Bottom_Exterior")
 
+
+    
+
     def layerset_bounds(self, layout, obj, location="Top_Interior"):
         set_usage = ObjectMaterialData.data.get("set_usage", {})
         layer_set_direction = set_usage.get("layer_set_direction")
@@ -437,3 +440,18 @@ class BIM_UL_materials(UIList):
                 if item.has_style:
                     row2.label(text="", icon="SHADING_RENDERED")
                 row2.label(text=str(item.total_elements))
+
+
+
+
+
+class BIM_MT_material_context_menu(bpy.types.Menu):
+    bl_label = "Material Context Menu"
+
+    def draw(self, context):
+        layout = self.layout
+        op = layout.operator("bim.material_ui_select", text="Select by Material", icon="RESTRICT_SELECT_OFF")
+        op.material = context.scene.select_by_material_id  # Use stored material
+
+
+