diff --git a/assets/office-no-roof.glb b/assets/office-no-roof.glb
new file mode 100644
index 0000000000..a58e1abf72
Binary files /dev/null and b/assets/office-no-roof.glb differ
diff --git a/dimensional/simple_scene.py b/dimensional/simple_scene.py
index 205f45ac03..db8d4bc8d7 100644
--- a/dimensional/simple_scene.py
+++ b/dimensional/simple_scene.py
@@ -1,6 +1,5 @@
 import genesis as gs
 gs.init(backend=gs.gpu)  
- 
 scene = gs.Scene(
     show_viewer=True,
     viewer_options=gs.options.ViewerOptions(
@@ -14,15 +13,18 @@
 # Add ground plane
 plane = scene.add_entity(gs.morphs.Plane())
 
-# Add the GLB model with fixed=True to make it static
+# Add the GLB model with collision mesh specification
 office = scene.add_entity(
     gs.morphs.Mesh(
-        file="../assets/office.glb",
+        file="../assets/office-no-roof.glb",
         fixed=True,  # Make it static
         euler=(-90, 180, 0),  # Adjust orientation if needed
         pos=(-2, 0, -13.21),  # Position offset (x, y, z)
         scale=1.0,
-    )
+        convexify=False,  # Don't create a single convex hull
+        merge_submeshes_for_collision = False,
+    ),
+   vis_mode='collision'  # Show collision geometries
 )
 
 scene.build()