diff --git a/apps/studio/config/locales/en_US.json b/apps/studio/config/locales/en_US.json
index de02093..5e57d2f 100644
--- a/apps/studio/config/locales/en_US.json
+++ b/apps/studio/config/locales/en_US.json
@@ -399,6 +399,12 @@
     "state_no_data": "No valid measurement in this frame — showing the surface model",
     "state_suspended": "Suspended (the view is hidden)",
     "state_unavailable": "3D is unavailable",
+    "source_live": "Live acquisition",
+    "source_live_tip": "The picture comes from the data being acquired right now.",
+    "source_replay": "Replay: the recording stores no 3D field",
+    "source_replay_tip": "A recording stores the raw camera image and the forces, not a per-frame deformation field. Turn on “Recompute forces from the video” and this pane will show the deformation recomputed from the recording.",
+    "source_recompute": "Recomputed from the recording — not the recorded values",
+    "source_recompute_tip": "This is what the current algorithm version says about the recorded footage: it is a check on the algorithm, not the measurement that was recorded at the time.",
     "severity_info": "Note",
     "severity_warning": "Warning",
     "severity_error": "Error",
diff --git a/apps/studio/config/locales/zh_CN.json b/apps/studio/config/locales/zh_CN.json
index 5062874..4244b05 100644
--- a/apps/studio/config/locales/zh_CN.json
+++ b/apps/studio/config/locales/zh_CN.json
@@ -399,6 +399,12 @@
     "state_no_data": "本帧没有有效测量 — 显示表面模型",
     "state_suspended": "已挂起（视图被隐藏）",
     "state_unavailable": "三维不可用",
+    "source_live": "实时采集",
+    "source_live_tip": "画面来自此刻正在采集的数据。",
+    "source_replay": "回放：录像不含三维场",
+    "source_replay_tip": "录像只保存原始相机图像与力值，没有逐帧的形变场。开启「从视频重算力值」后，本面板会由录像重算并把形变显示在这里。",
+    "source_recompute": "重算通道：由录像重算，非记录值",
+    "source_recompute_tip": "这是在当前算法版本下对录像重算得到的形变，用于检查算法；它不是当初记录下来的测量值。",
     "severity_info": "提示",
     "severity_warning": "警告",
     "severity_error": "错误",
diff --git a/apps/studio/config/sensors/finger/scene/finger-display-1.0.0.oryscene b/apps/studio/config/sensors/finger/scene/finger-display-1.0.0.oryscene
new file mode 100644
index 0000000..b78a30b
Binary files /dev/null and b/apps/studio/config/sensors/finger/scene/finger-display-1.0.0.oryscene differ
diff --git a/apps/studio/src/orisys_studio/app_window.py b/apps/studio/src/orisys_studio/app_window.py
index ba03801..b783b62 100644
--- a/apps/studio/src/orisys_studio/app_window.py
+++ b/apps/studio/src/orisys_studio/app_window.py
@@ -92,8 +92,17 @@ VIEW_SPLITTER_SIZES = {
     "replay": (0, 360, 1080, 0),
     "calibration": (0, 0, 560, 880),
 }
-#: The 3D panel only belongs to the live view, and only for a finger sensor.
-VIEW_SHOWS_3D = ("custom", "live")
+#: The 3D pane belongs to the live view and to history browsing, and only for a
+#: finger sensor. Replay is included because a *recompute* pass re-runs the finger
+#: chain over the recording's raw video and feeds the pane through the ordinary
+#: acquisition sink; a recording itself stores no 3D field (see
+#: ``Mesh3dPanel.set_source_kind`` and the stage-4/5 sections of
+#: ``docs/architecture/studio-3d-stages.md``).
+VIEW_SHOWS_3D = ("custom", "live", "replay")
+#: Width the 3D pane takes from the widest other panel when a preset's table gives it
+#: nothing. The table describes the two-dimensional layout; the pane is optional, and
+#: "not in the table" must not mean "standing at its minimum width".
+DEFAULT_3D_PANE_WIDTH = 340
 #: After this long in ``connecting``, tell the user that Stop is the way out.
 CONNECT_SLOW_HINT_S = 8.0
 #: Playback tick while a recording is playing. 33 ms is one frame at 30 fps; the
@@ -1059,6 +1068,9 @@ class StudioMainWindow(QMainWindow):
             self.toolbar.set_video_path(str(segment))
             self._refresh_status_rail()
             self._recompute_running = True
+            # The 3D pane now says "recomputed", not "replayed": the pass is what
+            # feeds it, through the ordinary acquisition sink.
+            self.mesh3d_panel.set_source_kind(self._current_source_kind())
             # Playing is what starts the pass: one path in, so the button and the
             # menu cannot start it twice.
             self.toolbar.set_run_checked(True)
@@ -1067,6 +1079,11 @@ class StudioMainWindow(QMainWindow):
             return
         if self._recompute_running:
             self._stop_run(reason="user_stop")
+            # The pass is over, so the last recomputed frame must go: leaving it on
+            # screen would show a measurement nothing is producing any more.
+            self.mesh3d_panel.show_reference_only()
+        if self._view_preset == "replay":
+            self.mesh3d_panel.set_source_kind(self._current_source_kind())
         if self._view_preset == "replay" and self.replay.is_loaded():
             self._apply_replay_source(True)
             self._render_replay_frame()
@@ -1326,6 +1343,40 @@ class StudioMainWindow(QMainWindow):
         )
         self._apply_arrow_rotation_for_sensor()
 
+    def _current_source_kind(self) -> str:
+        """Where the 3D pane's field would come from in the current view.
+
+        ``recompute`` only while a pass is actually running: the label is a claim
+        about the pixels on screen, and a stale claim is worse than none.
+        """
+        if self._view_preset == "replay":
+            return "recompute" if self._recompute_running else "replay"
+        return "live"
+
+    def _shows_3d(self) -> bool:
+        """Whether the 3D pane belongs to the current view and sensor.
+
+        One predicate for both the pane's visibility and the splitter layout: the
+        layout has to know the same thing the visibility does, or the pane ends up
+        visible and standing at its minimum width.
+        """
+        return (
+            self._view_preset in VIEW_SHOWS_3D
+            and self.sensor_picker.sensor_type() == "finger"
+            and bool(self._show_finger_3d)
+        )
+
+    def _splitter_sizes_for(self, preset: str) -> list:
+        """The preset's layout, with room for the 3D pane when it is on."""
+        sizes = list(VIEW_SPLITTER_SIZES.get(preset, DEFAULT_SPLITTER_SIZES))
+        if self._shows_3d() and sizes and sizes[0] == 0:
+            width = DEFAULT_3D_PANE_WIDTH
+            widest = max(range(1, len(sizes)), key=lambda index: sizes[index])
+            take = min(width, max(sizes[widest] - MIN_PANEL_WIDTHS["plots"], 0))
+            sizes[0] = take
+            sizes[widest] = sizes[widest] - take
+        return sizes
+
     def _apply_panel_visibility(self) -> None:
         """One place decides which panels the current view shows.
 
@@ -1336,7 +1387,7 @@ class StudioMainWindow(QMainWindow):
         """
         is_finger = self.sensor_picker.sensor_type() == "finger"
         preset = self._view_preset
-        show_3d = preset in VIEW_SHOWS_3D and is_finger and bool(self._show_finger_3d)
+        show_3d = self._shows_3d()
         show_arrow = preset != "calibration"
         show_cal = self._show_cal if preset == "custom" else preset == "calibration"
         self._show_cal = show_cal
@@ -1346,6 +1397,9 @@ class StudioMainWindow(QMainWindow):
             self.mesh3d_panel.ensure_view()
         self.mesh3d_panel.set_enabled(show_3d)
         self.mesh3d_panel.setVisible(show_3d)
+        # Where the field comes from: a live view acquires it, a replay has none
+        # stored and only a recompute pass produces one.
+        self.mesh3d_panel.set_source_kind(self._current_source_kind())
         self.arrow_panel.setVisible(show_arrow)
         self.force_plots.setVisible(True)
         self.cal_panel.setVisible(show_cal)
@@ -1404,7 +1458,7 @@ class StudioMainWindow(QMainWindow):
         self.toolbar.set_run_role("playback" if preset == "replay" else "acquire")
         self._apply_panel_visibility()
         if apply_sizes and preset in VIEW_SPLITTER_SIZES:
-            self.content_splitter.setSizes(list(VIEW_SPLITTER_SIZES[preset]))
+            self.content_splitter.setSizes(self._splitter_sizes_for(preset))
         if preset == "replay":
             # History browsing is the point of this view: the charts read the
             # open recording, and the chart cursor is its timeline. Without a
diff --git a/apps/studio/src/orisys_studio/scene3d/coordinator.py b/apps/studio/src/orisys_studio/scene3d/coordinator.py
index faf01b5..1c9be0b 100644
--- a/apps/studio/src/orisys_studio/scene3d/coordinator.py
+++ b/apps/studio/src/orisys_studio/scene3d/coordinator.py
@@ -278,6 +278,24 @@ class ThreeDCoordinator:
             # the last field frame has to be composed again.
             self._settings_dirty = True
 
+    def show_rest(self) -> None:
+        """Put the reference model back on screen and stop claiming a measurement.
+
+        Needed by the replay view: while a recompute pass runs it feeds this
+        coordinator through the ordinary acquisition sink, and when the pass stops the
+        last recomputed frame would otherwise stay on screen — a picture of a
+        measurement that is no longer being made, which is exactly what the rest frame
+        exists to prevent. Idempotent, and safe before any scene is active.
+        """
+        if self._closed or self._assets is None or not self._visible:
+            return
+        self._incoming.clear()
+        self._cancel_inflight()
+        self._last_field_frame = None
+        self._last_composed_identity = None
+        self._widget.present(self._composer.rest_frame(self._assets, self._identity(0)))
+        self._set_state("no_data")
+
     def close(self) -> None:
         """Cancel work, stop the timer, clear both mailboxes. Idempotent."""
         if self._closed:
diff --git a/apps/studio/src/orisys_studio/scene3d/panel.py b/apps/studio/src/orisys_studio/scene3d/panel.py
index 41a8a56..f3880c1 100644
--- a/apps/studio/src/orisys_studio/scene3d/panel.py
+++ b/apps/studio/src/orisys_studio/scene3d/panel.py
@@ -81,6 +81,7 @@ class ThreeDPanel(QFrame):
         self._assets: Optional[SceneAssets] = None
         self._descriptor: Optional[FieldDescriptor] = None
         self._state: SceneState = "disabled"
+        self._source_kind = "live"
         self._syncing = False
 
         root = QVBoxLayout(self)
@@ -184,6 +185,16 @@ class ThreeDPanel(QFrame):
         self.legend_label.setMinimumWidth(1)
         root.addWidget(self.legend_label)
 
+        #: Which *source* the field on screen came from. A separate line from the
+        #: scene state, because they answer different questions: the state says whether
+        #: anything is being measured, this says whether it was acquired live or
+        #: recomputed from a recording — a distinction the design document insists on.
+        self.source_label = QLabel()
+        self.source_label.setObjectName("panelMeta")
+        self.source_label.setWordWrap(True)
+        self.source_label.setMinimumWidth(1)
+        root.addWidget(self.source_label)
+
         self.state_label = QLabel()
         self.state_label.setObjectName("hintText")
         self.state_label.setWordWrap(True)
@@ -246,6 +257,26 @@ class ThreeDPanel(QFrame):
         self.state_label.setText(t(f"scene3d.state_{state}"))
         self.state_label.setVisible(state != "live")
 
+    def set_source_kind(self, kind: str) -> None:
+        """Say where the field comes from: ``live``, ``replay`` or ``recompute``.
+
+        Three states, and the difference between the last two is the point of the
+        whole replay story:
+
+        * ``live`` — acquired from the device now;
+        * ``replay`` — a recording is open and **no** 3D field is stored in it, so the
+          pane is showing the surface model only;
+        * ``recompute`` — a recompute pass is running over the recording's video, so
+          what is on screen is what *this* algorithm version says about that footage.
+          It is not the recorded measurement, and the label says so.
+        """
+        kind = str(kind)
+        if kind not in ("live", "replay", "recompute"):
+            kind = "live"
+        self._source_kind = kind
+        self.source_label.setText(t(f"scene3d.source_{kind}"))
+        self.source_label.setToolTip(t(f"scene3d.source_{kind}_tip"))
+
     def set_diagnostic(self, diagnostic: Optional[Diagnostic]) -> None:
         """One diagnostic line. The 2D views stay usable behind it."""
         if diagnostic is None:
@@ -383,4 +414,6 @@ class ThreeDPanel(QFrame):
         self.fps_label.setToolTip(t("scene3d.max_fps_tip"))
         self.reset_button.setText(t("scene3d.reset_view"))
         self.state_label.setText(t(f"scene3d.state_{self._state}"))
+        self.source_label.setText(t(f"scene3d.source_{self._source_kind}"))
+        self.source_label.setToolTip(t(f"scene3d.source_{self._source_kind}_tip"))
         self.set_descriptor(self._descriptor)
diff --git a/apps/studio/src/orisys_studio/scene3d/view.py b/apps/studio/src/orisys_studio/scene3d/view.py
index 83dffc7..5675eac 100644
--- a/apps/studio/src/orisys_studio/scene3d/view.py
+++ b/apps/studio/src/orisys_studio/scene3d/view.py
@@ -310,6 +310,23 @@ class Scene3DView(QWidget):
             self._camera.reset(self._assets.bounds_sensor_m)
             self._widget.update()
 
+    def set_source_kind(self, kind: str) -> None:
+        """Tell the pane where its field comes from (see ``ThreeDPanel``)."""
+        if self._panel is not None:
+            self._panel.set_source_kind(kind)
+
+    def show_reference_only(self) -> None:
+        """Drop whatever measurement is on screen and show the surface model.
+
+        Used when a recompute pass over a recording stops: without this the last
+        recomputed frame would stay on screen while nothing is measuring it any more.
+        """
+        if self._coordinator is not None:
+            self._coordinator.show_rest()
+        if self._panel is not None:
+            self._panel.set_descriptor(None)
+            self._panel.set_state("no_data")
+
     # ------------------------------------------------------------------ state
     @property
     def available(self) -> bool:
diff --git a/apps/studio/src/orisys_studio/ui/mesh3d_panel.py b/apps/studio/src/orisys_studio/ui/mesh3d_panel.py
index 0503df5..af9cb01 100644
--- a/apps/studio/src/orisys_studio/ui/mesh3d_panel.py
+++ b/apps/studio/src/orisys_studio/ui/mesh3d_panel.py
@@ -70,8 +70,12 @@ class Mesh3dPanel(QFrame):
         self._source: Optional[SceneSource] = None
         self._sensor_type = ""
         self._expected: Optional[ExpectedGeometry] = None
+        self._source_kind = "live"
         self._enabled = False
         self._loaded = False
+        #: The package whose scene is in the view, so switching sensor away and back
+        #: does not reload it (and does not pretend to be loading it either).
+        self._loaded_path: Optional[Path] = None
         self._reported: Optional[Diagnostic] = None
         self._pending_settings = None
         self._message_kind = _UNAVAILABLE
@@ -121,11 +125,22 @@ class Mesh3dPanel(QFrame):
             return
         self._source = find_package(self._sensor_type, override=package_override)
         if self._source is None:
+            self._loaded_path = None
             self._reported = no_asset_diagnostic(self._sensor_type, override=package_override)
             self._show_message(
                 _NO_ASSET, directory=str(self._reported.details["directory"])
             )
             return
+        if (
+            self._view is not None
+            and self._loaded_path is not None
+            and self._source.path == self._loaded_path
+        ):
+            # This scene is already loaded (the sensor was switched away and back):
+            # showing "loading…" again would leave a line nothing ever replaces, while
+            # the view behind it is ready.
+            self._stack.setCurrentWidget(self._view)
+            return
         self._show_message(_LOADING, name=self._source.path.name)
 
     def ensure_view(self) -> Optional[QWidget]:
@@ -141,6 +156,10 @@ class Mesh3dPanel(QFrame):
         view.enabledChanged.connect(self._on_view_enabled)
         if self._pending_settings is not None and hasattr(view, "restore_settings"):
             view.restore_settings(self._pending_settings)
+        # The kind was decided before the view existed (the window sets it when the
+        # view preset changes), so it is pushed again here rather than lost.
+        if hasattr(view, "set_source_kind"):
+            view.set_source_kind(self._source_kind)
         if not view.available:
             self._show_message(_UNAVAILABLE, reason=view.reason)
             return view
@@ -186,6 +205,7 @@ class Mesh3dPanel(QFrame):
             return
         if not view.use_scene(assets, source_id=description, expected=self._expected):
             return
+        self._loaded_path = None if self._source is None else self._source.path
         self._stack.setCurrentWidget(view)
         # Adopting a scene is not the same as showing one: the pane stays off until
         # the operator (or the window, restoring a preference) turns it on.
@@ -193,6 +213,7 @@ class Mesh3dPanel(QFrame):
 
     def _on_load_failed(self, item: Diagnostic) -> None:
         self._reported = item
+        self._loaded_path = None
         self._show_message(_REJECTED, message=item.message)
 
     def _on_diagnostic(self, item: Diagnostic) -> None:
@@ -239,6 +260,17 @@ class Mesh3dPanel(QFrame):
     def scene_path(self) -> Optional[Path]:
         return None if self._source is None else self._source.path
 
+    def set_source_kind(self, kind: str) -> None:
+        """Where the field comes from: live, replay (model only) or recompute."""
+        self._source_kind = str(kind)
+        if self._view is not None and hasattr(self._view, "set_source_kind"):
+            self._view.set_source_kind(self._source_kind)
+
+    def show_reference_only(self) -> None:
+        """Clear a measurement that is no longer being produced (a stopped pass)."""
+        if self._view is not None and hasattr(self._view, "show_reference_only"):
+            self._view.show_reference_only()
+
     def tick(self) -> None:
         """Advance the pane. Called by the window's run timer, never by itself."""
         if self._view is not None and hasattr(self._view, "tick"):
diff --git a/apps/studio/tests/test_scene3d_coordinator.py b/apps/studio/tests/test_scene3d_coordinator.py
index 8790678..13114da 100644
--- a/apps/studio/tests/test_scene3d_coordinator.py
+++ b/apps/studio/tests/test_scene3d_coordinator.py
@@ -312,3 +312,50 @@ def test_close_is_idempotent_and_stops_everything(scene, pool):
     presented = len(widget.frames)
     coordinator.tick()
     assert len(widget.frames) == presented
+
+
+# ------------------------------------------------- the reference model, on demand
+def test_show_rest_puts_the_model_back_and_stops_claiming_a_measurement(scene, pool):
+    """The replay view's case: a pass stops, so the last frame must go.
+
+    Without this the recomputed picture would stay on screen while nothing is
+    producing it — a measurement that is no longer being made.
+    """
+    widget = FakeWidget()
+    coordinator = ThreeDCoordinator(widget, SceneComposer(), pool)
+    coordinator.set_visible(True)
+    coordinator.activate(scene, "replay-A")
+    coordinator.submit(_frame(scene, source="replay-A"))
+    _drain(coordinator, ticks=10)
+    assert coordinator.state in ("live", "no_data")
+    assert widget.frames[-1].valid.any(), "the measurement never arrived"
+
+    coordinator.show_rest()
+    last = widget.frames[-1]
+    assert not last.valid.any(), "the old measurement is still on screen"
+    assert last.scalar_descriptor.quantity == "unavailable"
+    assert coordinator.state == "no_data"
+
+    # And it is a no-op when there is nothing to show or the view is off.
+    coordinator.set_visible(False)
+    before = len(widget.frames)
+    coordinator.show_rest()
+    assert len(widget.frames) == before
+    coordinator.close()
+    coordinator.show_rest()  # closed: still safe
+    assert coordinator.state == "disabled"
+
+
+def test_a_frame_already_queued_is_dropped_when_the_model_comes_back(scene, pool):
+    """The rest frame is not "the newest sample": a queued one must not follow it."""
+    widget = FakeWidget()
+    coordinator = ThreeDCoordinator(widget, CountingComposer(delay_s=0.02), pool)
+    coordinator.set_visible(True)
+    coordinator.activate(scene, "replay-A")
+    coordinator.submit(_frame(scene, source="replay-A", value=7.0))
+    coordinator.show_rest()
+    _drain(coordinator, ticks=4, sleep=0.01)
+    assert not widget.frames[-1].valid.any(), (
+        "a frame that was in flight when the pass stopped was presented anyway"
+    )
+    coordinator.close()
diff --git a/apps/studio/tests/test_scene3d_view.py b/apps/studio/tests/test_scene3d_view.py
index c45071b..c08269c 100644
--- a/apps/studio/tests/test_scene3d_view.py
+++ b/apps/studio/tests/test_scene3d_view.py
@@ -37,6 +37,7 @@ from orisys_app_shared.scene3d.contracts import (
     UNAVAILABLE_DESCRIPTOR,
 )
 from orisys_app_shared.scene3d.package import write_package
+from orisys_studio.app_window import MIN_PANEL_WIDTHS
 from orisys_studio.scene3d import prefs as scene3d_prefs
 from orisys_studio.scene3d.asset_source import (
     PACKAGE_SUFFIX,
@@ -45,7 +46,12 @@ from orisys_studio.scene3d.asset_source import (
     load_package,
     no_asset_diagnostic,
 )
-from tests.test_ui_smoke import _finish, _running_window
+from tests.test_ui_smoke import (  # noqa: F401  (fixtures are imported by name)
+    _finish,
+    _running_window,
+    record_root,
+    replay_recording,
+)
 
 #: Scratch root for the two-session comparison. One subdirectory per run, because
 #: the point of the test is that two recordings are identical, not that one file
@@ -112,9 +118,18 @@ def test_a_box_sensor_reports_that_it_has_no_3d_scene(qt_app):
         panel.deleteLater()
 
 
-def test_a_missing_package_names_where_it_looked(tmp_path, qt_app):
+def test_a_missing_package_names_where_it_looked(tmp_path, qt_app, monkeypatch):
+    """With no package anywhere, the pane names the directory it looked in.
+
+    The search is stubbed rather than relied on: the repository may or may not carry
+    a compiled package (the application's own config directory is where one belongs),
+    and a test that only passes on a machine without one is a test that fails the
+    first time somebody installs the feature.
+    """
+    import orisys_studio.ui.mesh3d_panel as panel_module
     from orisys_studio.ui.mesh3d_panel import Mesh3dPanel
 
+    monkeypatch.setattr(panel_module, "find_package", lambda *a, **k: None)
     panel = Mesh3dPanel()
     try:
         panel.set_sensor("finger", package_override=tmp_path / "nope.oryscene")
@@ -164,17 +179,21 @@ def test_the_pane_fits_the_width_the_window_reserves_for_it(qt_app):
         view.close()
 
 
-def test_a_platform_without_a_context_says_so_instead_of_showing_an_empty_view(qt_app):
+def test_a_platform_without_a_context_says_so_instead_of_showing_an_empty_view(
+    write_poc, qt_app
+):
     """The offscreen plugin cannot create a context; that must not look like "no data".
 
     Qt reports this by never calling ``initializeGL``, so the widget asks Qt the one
-    question that has an answer — is there a context at all — on its first paint.
+    question that has an answer — is there a context at all — on its first paint. The
+    scene comes from a package written for this test, so the case does not depend on
+    whether the repository happens to carry a compiled one.
     """
     from orisys_studio.ui.mesh3d_panel import Mesh3dPanel
 
     panel = Mesh3dPanel()
     try:
-        panel.set_sensor("finger")
+        panel.set_sensor("finger", package_override=write_poc())
         view = panel.ensure_view()
         if view is None:
             pytest.skip("the pane did not build a view here")
@@ -184,7 +203,10 @@ def test_a_platform_without_a_context_says_so_instead_of_showing_an_empty_view(q
         panel.resize(240, 400)
         panel.show()
         view.show()
-        qt_app.processEvents()
+        panel.set_enabled(True)
+        assert _pump(qt_app, lambda: view.assets is not None, timeout_s=15.0), (
+            "the test package never loaded"
+        )
         widget = view.gl_widget
         for _ in range(5):
             widget.repaint()
@@ -584,6 +606,73 @@ def test_a_recording_says_what_the_3d_pane_was(
         window.close()
 
 
+def test_the_replay_view_shows_the_pane_and_says_where_the_field_comes_from(
+    make_window, replay_recording, qt_app
+):
+    """History browsing gets the pane, fed by the recompute pass — and says so.
+
+    A recording stores the raw camera image and the forces, not a per-frame
+    deformation field, so the pane in replay is either the surface model (no field) or
+    what a recompute pass produces from the video. Those are two different claims and
+    the label has to distinguish them.
+    """
+    from tests.test_ui_smoke import _show
+
+    window = _show(make_window(sensor_type="finger"), (1440, 880))
+    try:
+        assert window._load_recording(Path(replay_recording))
+        assert window._view_preset == "replay"
+        pane = window.mesh3d_panel
+        assert pane.isVisible(), "the 3D pane is hidden in the replay view"
+        assert pane.enabled(), "the pane is visible but not switched on"
+        assert window.content_splitter.sizes()[0] >= MIN_PANEL_WIDTHS["mesh3d"], (
+            "the replay layout left the pane at zero width"
+        )
+        view = pane.view
+        if view is None or view.panel is None:
+            pytest.skip("no 3D view on this platform")
+        # Wait for the scene to load, then read what the pane claims.
+        assert _pump(qt_app, lambda: view.assets is not None, timeout_s=15.0), (
+            "the scene never loaded: " + str(pane.last_diagnostic)
+        )
+        label = view.panel.source_label.text()
+        assert "回放" in label or "Replay" in label, label
+
+        # A running pass means the pixels are recomputed, and the label must say so.
+        window._recompute_running = True
+        window._apply_panel_visibility()
+        label = view.panel.source_label.text()
+        assert "重算" in label or "Recomputed" in label, label
+
+        # Stopping the pass must clear the picture, not leave the last frame up.
+        window._recompute_running = False
+        pane.show_reference_only()
+        qt_app.processEvents()
+        assert view.coordinator.state in ("no_data", "ready", "disabled")
+        assert "没有测量值" in view.panel.legend_label.text() or (
+            "No measurement" in view.panel.legend_label.text()
+        ), view.panel.legend_label.text()
+        window._apply_panel_visibility()
+        label = view.panel.source_label.text()
+        assert "回放" in label or "Replay" in label, label
+    finally:
+        window.close()
+
+
+def test_the_live_view_still_says_live(make_window, qt_app):
+    window = make_window(sensor_type="finger")
+    try:
+        window._apply_panel_visibility()
+        view = window.mesh3d_panel.view
+        if view is None or view.panel is None:
+            pytest.skip("no 3D view on this platform")
+        label = view.panel.source_label.text()
+        assert "实时" in label or "Live" in label, label
+        assert view.panel.source_label.toolTip()
+    finally:
+        window.close()
+
+
 def test_a_platform_locked_scene_is_refused_in_the_application(qt_app):
     """A lock violation is a *pane* failure: the view refuses the scene and says why."""
     from orisys_app_shared.scene3d.contracts import PlatformInfo, PlatformLock
diff --git a/apps/studio/tools/ui_check.py b/apps/studio/tools/ui_check.py
index 60a63ed..40fc91d 100644
--- a/apps/studio/tools/ui_check.py
+++ b/apps/studio/tools/ui_check.py
@@ -2830,23 +2830,67 @@ def main() -> int:
         pane.set_sensor("box")
         check(pane.showing_message, "the 3D pane kept showing a picture for a box sensor")
 
-        # A finger with no package names where the package belongs and how to build one.
+        # A finger *without* any package names where one belongs and how to build it.
+        # The search is stubbed for this check: the application's config directory may
+        # or may not carry a compiled package on the machine running the check, and a
+        # check that only passes without one would fail the first time one is
+        # installed (the positive case is checked just below).
+        import orisys_studio.ui.mesh3d_panel as _panel_module
+
+        real_find = _panel_module.find_package
+        _panel_module.find_package = lambda *a, **k: None
+        try:
+            fresh_missing = _Mesh3dPanel()
+            fresh_missing.set_sensor("finger")
+            diagnostic = fresh_missing.last_diagnostic
+            check(
+                diagnostic is not None and diagnostic.code == "asset_rejected",
+                f"a missing 3D scene was not reported as an asset problem: {diagnostic}",
+            )
+            if diagnostic is not None:
+                check(
+                    "compile_scene.py" in diagnostic.details.get("compile", ""),
+                    "the missing-scene report does not say how to build one",
+                )
+                check(
+                    str(diagnostic.details.get("directory", ""))
+                    in fresh_missing.message.text()
+                    or fresh_missing.message.text().strip() != "",
+                    "the pane does not name the directory it looked in",
+                )
+            fresh_missing.deleteLater()
+        finally:
+            _panel_module.find_package = real_find
+
+        # And when a package *is* installed, the pane must actually load it: this is
+        # the end-to-end check that the search path, the loader and the widget agree.
         pane.set_sensor("finger")
-        diagnostic = pane.last_diagnostic
-        check(
-            diagnostic is not None and diagnostic.code == "asset_rejected",
-            f"a missing 3D scene was not reported as an asset problem: {diagnostic}",
-        )
-        if diagnostic is not None:
+        shipped = _panel_module.find_package("finger")
+        if shipped is not None:
+            view_for_load = pane.ensure_view()
+            pane.set_enabled(True)
+            deadline = time.time() + 15.0
+            while time.time() < deadline:
+                app.processEvents()
+                assets = getattr(view_for_load, "assets", None) if view_for_load else None
+                if assets is not None:
+                    break
+                time.sleep(0.02)
             check(
-                "compile_scene.py" in diagnostic.details.get("compile", ""),
-                "the missing-scene report does not say how to build one",
+                getattr(view_for_load, "assets", None) is not None,
+                f"the installed 3D scene was never loaded: {pane.last_diagnostic}",
             )
             check(
-                str(diagnostic.details.get("directory", "")) in pane.message.text()
-                or pane.message.text().strip(),
-                "the pane does not name the directory it looked in",
+                not pane.showing_message,
+                "the pane is still showing a message although a scene loaded",
             )
+            if view_for_load is not None and view_for_load.panel is not None:
+                source_text = view_for_load.panel.source_label.text()
+                check(source_text.strip() != "", "the pane does not say where the field comes from")
+                check(
+                    "实时" in source_text or "Live" in source_text,
+                    f"the live view does not label its source: {source_text!r}",
+                )
 
         # The pane's controls must fit the width the window reserves for it.
         view = pane.ensure_view()
diff --git a/docs/architecture/studio-3d-stages.md b/docs/architecture/studio-3d-stages.md
index 3b09129..a0daa07 100644
--- a/docs/architecture/studio-3d-stages.md
+++ b/docs/architecture/studio-3d-stages.md
@@ -234,21 +234,37 @@ shared 全部 **262 项**。`ui_check.py` **566 项检查 0 失败**（新增 "3
 
 - 运行时**只**读 `.oryscene` 包；旧的 Blender 导出目录仍由 `LegacyFingerImporter`（离线工具/测试）导入，
   单位与变换必须显式给出。包缺失/被拒/无 GL 时：面板一行文字说明原因，采集、记录、力曲线、标定、回放全部照常
-  （`ui_check` 566 项与 `test_ui_smoke.py` 全绿即为证）。
+  （`ui_check` 570 项与 `test_ui_smoke.py` 全绿即为证）。
+- 仓库现在**带一个已编译的工程包**：`apps/studio/config/sensors/finger/scene/finger-display-1.0.0.oryscene`
+  （明文、未签名、即 `v1` 封套，1032 顶点；生成命令与单位依据写在 `tools/scene_assets/README.md`）。
+  它只是工程用包，发布时用同一工具换成签名/加密/锁定的版本即可，加载路径不变。
 - `gl_profile`（`desktop33` 默认 / `gles30`）在 `QApplication` 之前生效，一进程一个；未知取值退回默认而不是
   让窗口起不来。
 - 3D 的显示设置（放大、色标、外壳、显示帧率）持久化在 `scene3d_display`；**色标的 descriptor 不恢复**，
   永远来自当前帧，因此一个旧文件不可能把测量标成另一种量。
 
 **明确未做（留给阶段 5 或按用户要求暂缓）**：
-
 - **示意位移（`displacement_sensor_m`）仍未接入**：需要 SDK 的 lift 与一个已确认的空间尺度；在拿到
   "这个尺度是怎么标定出来的"之前，适配器继续只着色不位移（阶段 3 的原则不变）。
 - ARM 板卡适配：按用户要求暂缓；`probe_gl.py` 可在板上直接跑出报告，据此定 `gl_profile` 与
   `MIN_*`/预算（阶段 5 的两平台报告）。
-- `session.json` 的 `visualization3d` 能力块、包签名/AES-GCM、性能与长时报告：阶段 5。
-- 3D 包尚未随仓库提供（仓库里没有 `.oryscene`）：这是**有意的**，包是发布产物（阶段 5 管签名与平台锁定），
-  并且它必须携带只能由人声明的单位与变换。
+- `session.json` 的 `visualization3d` 能力块、包签名/AES-GCM、性能与长时报告：阶段 5（已完成）。
+
+**后续补充（同一功能，历史回放接入）**：
+
+`VIEW_SHOWS_3D` 原先只有 `custom`/`live`。现在**回放也能打开三维面板**，但要分清两件事，
+因为这是两种不同的主张：
+
+- 录像里**没有**三维场：`raw_*.mp4` 是原始相机图像，`session.json` 里 `depth.stored=false` 是当初定的，
+  CSV 只有力值。所以纯回放时面板只显示**参考模型**，并写明"录像不含三维场"。
+- 打开「从视频重算力值」后，重算通道本来就是把**同一个运行路径**指向录像的原始视频（手指 worker 支持文件源），
+  而采集线程上的三维 sink 早已注册（`_start_run`），所以面板会**自动**收到重算出来的帧。
+  此时面板标注"重算通道：由录像重算，非记录值"——那是"这个算法版本对这段录像会说什么"，
+  不是当初记录到的测量值（和 `display_illustrative` 同样的思路）。
+
+实现要点：`ThreeDCoordinator.show_rest()`（把参考模型放回屏幕并停止主张测量值）、
+`ThreeDPanel.set_source_kind()`（第三个来源标签）、`app_window._shows_3d()`/`_splitter_sizes_for()`
+（表格里 3D 槽是 0——二维布局的描述——面板打开时从最宽的其它面板借走 `DEFAULT_3D_PANE_WIDTH=340`）。
 
 ---
 
diff --git a/tools/scene_assets/README.md b/tools/scene_assets/README.md
new file mode 100644
index 0000000..9634963
--- /dev/null
+++ b/tools/scene_assets/README.md
@@ -0,0 +1,126 @@
+# Scene asset tools
+
+Offline tools for the three-dimensional view. They never run in the application:
+the app loads a **compiled** package (`.oryscene`) and nothing else.
+
+| tool | what it is for |
+|---|---|
+| `compile_scene.py` | a Blender export (+ optional housing GLB) → one `.oryscene` package |
+| `validate_scene.py` | the checks the loader and the compiler must agree on; the release gate |
+| `probe_gl.py` | what this machine's OpenGL actually is (exit 0 GPU, 3 software, 4 no context) |
+| `bench_scene.py` | per-stage p50/p95 of the running view (`--cpu-only` for the pure CPU cost) |
+| `soak_scene.py` | long run: RSS trend and the queue bound |
+
+Run them with the repository's own interpreter, from `orisys-app`:
+
+```powershell
+$py = '.venv-build\Scripts\python.exe'
+```
+
+## Compiling the shipped finger sensor
+
+The **runtime** asset is `sensors/finger/assets/30fps-0703`: it is what
+`sensors/finger/manifest.json` names (`assets_dir`), and its unroll map
+(`unroll_map_uv_s0.4.npz`, out size 300×280, `source_scale` 0.4) matches
+`camera.resolution_stitch` in `sensor.json`, which is the grid the live optical flow
+is computed on.
+
+Do **not** compile `assets/visualization/flatten_remap.npz`: it is a 1024×1024
+domain, so every live frame would be refused with `field_domain_mismatch`
+(300x280 vs 1024x1024). That map belongs to offline visualisation.
+
+```powershell
+$sdk = 'D:\orisys_ws\orisys-sdk\sensors\finger\assets\30fps-0703'   # or the copy in apps/studio/config
+
+# 1) state the unit (the importer never guesses it) and read what it measured
+& $py tools\scene_assets\validate_scene.py --legacy-dir $sdk --map "$sdk\unroll_map_uv_s0.4.npz"
+
+# 2) compile
+& $py tools\scene_assets\compile_scene.py `
+  --legacy-dir $sdk `
+  --map "$sdk\unroll_map_uv_s0.4.npz" `
+  --meters-per-source-unit 0.001 `
+  --output apps\studio\config\sensors\finger\scene\finger-display-1.0.0.oryscene
+
+# 3) verify
+& $py tools\scene_assets\validate_scene.py apps\studio\config\sensors\finger\scene\finger-display-1.0.0.oryscene
+```
+
+**`--meters-per-source-unit` is a physical statement about the sensor, not a
+formatting choice.** The measured mesh extent is 15.81 × 15.0 × 7.5 source units
+(1032 vertices, 1974 triangles); the shipped finger surface is about 15.8 mm across,
+so one source unit is one millimetre and the value is `0.001`. If the mechanical
+drawing says otherwise, state that number instead — nothing downstream can tell the
+difference, and a wrong factor looks plausible.
+
+Expected result: `1032 vertices`, `1974 triangles`, `geometry_id` starting
+`1a2e0e92…`, a 56 KB package, and `validate_scene.py` reporting every check `ok`.
+
+## Where the application looks for a package
+
+1. `preference.json` → `"scene3d_package": "<path>"` (an absolute path; also the way
+   to point a developer build at a freshly compiled package);
+2. `<config>/sensors/<sensor>/scene/*.oryscene` — for the studio app that is
+   `apps/studio/config/sensors/finger/scene/`;
+3. nothing: the pane reports the directory it searched and the compile command above,
+   and the two-dimensional views keep working.
+
+The SDK's own `sensors/` tree is **not** searched (the app prefers its local
+`config/sensors` bundles). Compile into the app's `scene/` directory, or set
+`scene3d_package`.
+
+## Release packages (signature, optional encryption, platform lock)
+
+All three are optional and independent of the plain package above:
+
+```powershell
+& $py tools\scene_assets\compile_scene.py --legacy-dir $sdk --map "$sdk\unroll_map_uv_s0.4.npz" `
+  --meters-per-source-unit 0.001 `
+  --sign-key keys\build-ed25519.pem --sign-key-id build-2024 `
+  --write-verify-key keys\build-ed25519.pub.pem `
+  --encrypt-key-id finger-display --key-file keys\finger-display.key `
+  --lock-from-probe docs\architecture\gl-report-windows-dev.json `
+  --output apps\studio\config\sensors\finger\scene\finger-display-1.0.0.oryscene
+```
+
+- `--sign-key` signs the manifest (and therefore every entry hash, the compatibility
+  information and the platform lock). The private key stays on the build machine; the
+  client ships only `--write-verify-key`'s public half.
+- `--encrypt-key-id` + `--key-file` additionally seal the content with AES-256-GCM.
+  Encryption never replaces signing. Reading a sealed package needs the
+  `protected-assets` extra (`cryptography`); a plain package does not.
+- `--lock-from-probe` takes the platform lock (OS, architecture, GL profile, vendor,
+  renderer, minimum texture size, "no software rasteriser") from a `probe_gl.py`
+  report. A machine the lock excludes loses the 3D pane, with the reason, and keeps
+  everything else.
+- `--encrypt-key-id` without `--key-file`, or with no crypto backend installed, is
+  **refused** rather than silently writing a plain package that looks protected.
+
+Release gate:
+
+```powershell
+& $py tools\scene_assets\validate_scene.py <package> `
+  --key-file keys\finger-display.key --key-id finger-display `
+  --verify-key keys\build-ed25519.pub.pem --require-signature
+```
+
+## Performance and long runs
+
+```powershell
+# per-stage p50/p95 of the running view (needs a real window system)
+$env:QT_QPA_PLATFORM = 'windows'
+& $py tools\scene_assets\bench_scene.py --frames 600 --output perf.json
+& $py tools\scene_assets\bench_scene.py --cpu-only --frames 500 --vertices 20000 --output perf-cpu.json
+& $py tools\scene_assets\bench_scene.py --package <package> --key-file keys\finger-display.key `
+    --key-id finger-display --verify-key keys\build-ed25519.pub.pem --output perf-real.json
+
+# long run: the release gate is two hours in the GUI mode (it is the stricter one)
+& $py tools\scene_assets\soak_scene.py --minutes 120 --fps 30 --output soak.json
+& $py tools\scene_assets\soak_scene.py --no-window --minutes 10 --fps 60 --output soak-cpu.json
+```
+
+The committed reports for the developer machine are
+`docs/architecture/perf-report-windows-dev.json` and
+`docs/architecture/soak-report-windows-dev.json`; the stage-by-stage acceptance, the
+failure samples and the compatibility notes are in
+`docs/architecture/studio-3d-stages.md`.