diff --git a/examples/07_paraview/WaveletROI/app.py b/examples/07_paraview/WaveletROI/app.py
index 85896f2f..3c948035 100644
--- a/examples/07_paraview/WaveletROI/app.py
+++ b/examples/07_paraview/WaveletROI/app.py
@@ -1,26 +1,42 @@
+import paraview.web.venv
 from trame.app import get_server
 from trame.ui.vuetify3 import SinglePageWithDrawerLayout
 from trame.widgets import vuetify3 as v3, paraview as pv_widgets
 from trame.decorators import TrameApp, change
 
-from paraview import simple
+from paraview import simple, servermanager
 
 
 @TrameApp()
 class App:
     def __init__(self, server=None):
         self.server = get_server(server, client_type="vue3")
+        self.state.volume = 0
 
-        # PV pipeline
+        # Data source
         self.source = simple.Wavelet()
+        self.source.UpdatePipeline()
+
+        # Extract info
+        ds = servermanager.Fetch(self.source)
+        self.origin = ds.GetOrigin()
+        self.spacing = ds.GetSpacing()
+        self.extent = ds.GetExtent()
+
+        # Pipeline
         self.extract = simple.ExtractSubset(
             Input=self.source,
-            VOI=[-10, 10, -10, 10, -10, 10],
+            VOI=list(self.extent),
         )
         self.representation = simple.Show(self.extract)
         self.representation.SetRepresentationType("Volume")
         self.view = simple.Render()
 
+        # bbox
+        self.box = simple.Box()
+        self.box_rep = simple.Show(self.box)
+        self.box_rep.SetRepresentationType("Wireframe")
+
         self._build_ui()
 
     @property
@@ -33,16 +49,41 @@ def ctrl(self):
 
     @change("i_range", "j_range", "k_range")
     def update_roi(self, i_range, j_range, k_range, **_):
+        # Update Volume
         self.extract.VOI = [*i_range, *j_range, *k_range]
+
+        # Update box
+        self.box.XLength = self.spacing[0] * (i_range[1] - i_range[0])
+        self.box.YLength = self.spacing[1] * (j_range[1] - j_range[0])
+        self.box.ZLength = self.spacing[2] * (k_range[1] - k_range[0])
+        self.box.Center = [
+            self.origin[0] + 0.5 * self.spacing[0] * (i_range[1] + i_range[0]),
+            self.origin[1] + 0.5 * self.spacing[0] * (j_range[1] + j_range[0]),
+            self.origin[2] + 0.5 * self.spacing[0] * (k_range[1] + k_range[0]),
+        ]
+
+        # Compute volume
+        self.extract.UpdatePipeline()
+        bounds = self.extract.GetDataInformation().GetBounds()
+        self.state.volume = (
+            (bounds[1] - bounds[0]) * (bounds[3] - bounds[2]) * (bounds[5] - bounds[4])
+        )
+
         self.ctrl.view_update()
 
     def _build_ui(self):
         with SinglePageWithDrawerLayout(self.server, full_height=True) as layout:
+            with layout.toolbar:
+                v3.VLabel(
+                    "Extent [{{i_range.join(', ')}}, {{j_range.join(', ')}}, {{k_range.join(', ')}}] - Volume: {{ volume }}",
+                    classes="mx-2",
+                )
+                v3.VBtn(icon="mdi-crop-free", click=self.ctrl.view_reset_camera)
             with layout.drawer as drawer:
                 drawer.width = 300
                 with v3.VCol():
                     v3.VRangeSlider(
-                        v_model=("i_range", [-10, 10]),
+                        v_model=("i_range", self.extent[0:2]),
                         min=-10,
                         max=10,
                         step=1,
@@ -50,7 +91,7 @@ def _build_ui(self):
                         hide_details=True,
                     )
                     v3.VRangeSlider(
-                        v_model=("j_range", [-10, 10]),
+                        v_model=("j_range", self.extent[2:4]),
                         min=-10,
                         max=10,
                         step=1,
@@ -58,7 +99,7 @@ def _build_ui(self):
                         hide_details=True,
                     )
                     v3.VRangeSlider(
-                        v_model=("k_range", [-10, 10]),
+                        v_model=("k_range", self.extent[4:]),
                         min=-10,
                         max=10,
                         step=1,
@@ -67,9 +108,10 @@ def _build_ui(self):
                     )
 
             with layout.content:
-                with v3.VContainer(fluid=True, classes="fill-height"):
+                with v3.VContainer(fluid=True, classes="fill-height pa-0"):
                     with pv_widgets.VtkRemoteView(
-                        self.view, interactive_ratio=1
+                        self.view,
+                        interactive_ratio=1,
                     ) as view:
                         self.ctrl.view_update = view.update
                         self.ctrl.view_reset_camera = view.reset_camera