回放叠加改用展开底图，并统一 2D/3D 投递。

箭头/采集图像与 live 的 processed_frame 对齐；deliver_measurement 先画 2D 再提交同一包给 3D。已用 overlay、scene3d 与 replay 相关测试验证。

apps/studio/src/orisys_studio/app_window.py

@@ -17,9 +17,11 @@ from orisys_app_shared.acquisition.display_orientation import (
 )
 from orisys_app_shared.acquisition.image_backend import (
     DEPTH,
+    SOURCE_ANALYSIS,
     SOURCE_LIVE,
     SOURCE_PREVIEW,
     SOURCE_RECOMPUTE,
+    SOURCE_REPLAY,
     DomainMaskLatch,
     ImageFrame,
     plan_image,
@@ -210,7 +212,6 @@ class StudioMainWindow(QMainWindow):
         self.session = SessionController(
             recording=self.recording,
             packet_sink=self._on_packet_recorded,
-            packet_for_3d=self._on_packet_for_3d,
             sensor_type="box",
         )
         self.session.tick.connect(self._on_run_tick)
@@ -555,7 +556,25 @@ class StudioMainWindow(QMainWindow):
         self._show_image_frame(frame)
 
     def show_analysis_packet(self, packet) -> None:
-        self._show_analysis_frame(packet)
+        self.deliver_measurement(packet, advance="flush", paint_2d=False)
+
+    def deliver_measurement(
+        self,
+        packet,
+        *,
+        advance: str = "tick",
+        arrow_policy=None,
+        image_source: str | None = None,
+        paint_2d: bool = True,
+    ) -> None:
+        """One packet to 2D then 3D: live and replay share this exit."""
+        self._deliver_measurement(
+            packet,
+            advance=advance,
+            arrow_policy=arrow_policy,
+            image_source=image_source,
+            paint_2d=paint_2d,
+        )
 
     def drop_render_marker(self) -> None:
         self._drop_render_marker()
@@ -1975,19 +1994,6 @@ class StudioMainWindow(QMainWindow):
 
         return describe
 
-    def _on_packet_for_3d(self, packet) -> None:
-        """Runs on the **acquisition thread**.
-
-        The pane copies what it needs into a read-only frame and offers it to a
-        capacity-one mailbox; it never touches the recording, the session store or the
-        camera. The view is the one that decides it is switched off, so this stays a
-        reference read and a method call.
-        """
-        view = self.mesh3d_panel.view
-        if view is None:
-            return
-        view.submit_packet(packet)
-
     def _on_scene3d_settings(self) -> None:
         """Open the 3D settings dialog — or say why there is nothing to configure."""
         if not self.mesh3d_panel.open_settings():
@@ -2346,12 +2352,12 @@ class StudioMainWindow(QMainWindow):
         # A new session invalidates the previous recording.
         self._stop_recording(wait=True)
         self.session.select_worker(sensor_type)
-        # Both sinks are on the worker we are about to start (``select_worker`` wires
-        # them, and ``add_sink`` is idempotent): the record channel and the 3D pane.
-        # The 3D pane has to know that a *new* session is starting: its frames carry
-        # this session's id, and to the coordinator an unfamiliar id is otherwise a
-        # stale frame from a previous session — which is how the pane ended up frozen
-        # on the first run's last picture for every run after it.
+        # The record channel is the only acquisition-thread sink; 3D is submitted on
+        # the GUI deliver path with 2D. The 3D pane still has to know that a *new*
+        # session is starting: its frames carry this session's id, and to the
+        # coordinator an unfamiliar id is otherwise a stale frame from a previous
+        # session — which is how the pane ended up frozen on the first run's last
+        # picture for every run after it.
         self.mesh3d_panel.begin_session()
         # The filters for this session, before it opens the device: the chain runs
         # in the SDK, so this is the one moment the choice can be handed over.
@@ -2585,12 +2591,13 @@ class StudioMainWindow(QMainWindow):
 
         Errors, end reasons and a stuck connect stay here — they call stop. A live
         packet's charts, calibration sampling and 2D/3D paint live in the presenter
-        so a replay owning the image cannot be overwritten by accident.
+        so a replay owning the image cannot be overwritten by accident. 3D is
+        submitted with 2D on ``deliver_measurement``; the timer then composes.
         """
         presenter = self.acquire_presenter
-        if presenter is not None:
-            presenter.tick_3d(display_paused=self._display_paused)
         if self._active_worker is None:
+            if presenter is not None:
+                presenter.tick_3d(display_paused=self._display_paused)
             return
         # Record bookkeeping happens before anything that can return early: a
         # recording that failed while the device was quiet still has to update
@@ -2635,6 +2642,8 @@ class StudioMainWindow(QMainWindow):
         if packet is None or presenter is None:
             return
         presenter.present(packet, display_paused=self._display_paused)
+        # Compose after deliver_measurement submitted this tick's packet.
+        presenter.tick_3d(display_paused=self._display_paused)
 
     # ------------------------------------------------------------ depth scale
     def _depth_range(self) -> tuple[float, float] | None:
@@ -2708,28 +2717,58 @@ class StudioMainWindow(QMainWindow):
         return self._domain_mask.update(frame.valid_mask)
 
     def _render_run_image(self, packet) -> None:
+        """Live / recompute entry into the shared 2D→3D deliver path."""
         if packet is None or self._replay_owns_image():
             return
-        flow_valid = getattr(packet, "flow_valid", None)
-        depth_valid = getattr(packet, "depth_valid", None)
-        stale = bool(getattr(packet, "stale_forces", False)) or (
-            flow_valid is False and depth_valid is False
-        )
-        self._show_image_frame(
-            ImageFrame(
-                getattr(packet, "processed_frame", None),
-                flow=getattr(packet, "flow", None),
-                depth=getattr(packet, "depth", None),
-                valid_mask=getattr(packet, "valid_mask", None),
-                source=SOURCE_RECOMPUTE if self._recompute_running else SOURCE_LIVE,
-                frame_id=int(getattr(packet, "frame_id", 0) or 0),
-                t_rel_s=float(getattr(packet, "mono_t", 0.0) or 0.0),
-                stale=stale,
-                flow_valid=flow_valid,
-                flow_frame_id=getattr(packet, "flow_frame_id", None),
-                depth_valid=depth_valid,
-                depth_frame_id=getattr(packet, "depth_frame_id", None),
+        self._deliver_measurement(packet, advance="tick")
+
+    def _deliver_measurement(
+        self,
+        packet,
+        *,
+        advance: str = "tick",
+        arrow_policy=None,
+        image_source: str | None = None,
+        paint_2d: bool = True,
+    ) -> None:
+        """Paint 2D from a packet, then submit that same packet to 3D.
+
+        Live and replay differ only in how the packet was built and whether the
+        3D mailbox advances on the run timer (``tick``) or must ``flush`` now.
+        """
+        if packet is None:
+            return
+        if paint_2d:
+            flow_valid = getattr(packet, "flow_valid", None)
+            depth_valid = getattr(packet, "depth_valid", None)
+            stale = bool(getattr(packet, "stale_forces", False)) or (
+                flow_valid is False and depth_valid is False
             )
+            source = image_source
+            if source is None:
+                source = (
+                    SOURCE_RECOMPUTE if self._recompute_running else SOURCE_LIVE
+                )
+            self._show_image_frame(
+                ImageFrame(
+                    getattr(packet, "processed_frame", None),
+                    flow=getattr(packet, "flow", None),
+                    depth=getattr(packet, "depth", None),
+                    valid_mask=getattr(packet, "valid_mask", None),
+                    source=source,
+                    frame_id=int(getattr(packet, "frame_id", 0) or 0),
+                    t_rel_s=float(getattr(packet, "mono_t", 0.0) or 0.0),
+                    stale=stale,
+                    flow_valid=flow_valid,
+                    flow_frame_id=getattr(packet, "flow_frame_id", None),
+                    depth_valid=depth_valid,
+                    depth_frame_id=getattr(packet, "depth_frame_id", None),
+                    result_available=source in (SOURCE_ANALYSIS, SOURCE_REPLAY),
+                    arrow_policy=arrow_policy,
+                )
+            )
+        self._submit_measurement_3d(
+            packet, advance=advance, overlay_policy=arrow_policy
         )
 
     def _show_image_frame(self, frame: ImageFrame) -> None:
@@ -2934,37 +2973,39 @@ class StudioMainWindow(QMainWindow):
         self._analysis_reference_override = setup.reference_frame
         return True
 
-    def _show_analysis_frame(self, packet) -> None:
-        """Hand one stored analysis frame to the 3D pane's producer.
+    def _submit_measurement_3d(
+        self, packet, *, advance: str = "tick", overlay_policy=None
+    ) -> None:
+        """Submit one packet to the 3D producer after 2D has been painted.
 
-        The pane snapshots a packet through its ordinary path, so a replay's figures go
-        through the same adapter, domain latch and mask intersection as a live run. The
-        producer is O(1) and Qt-free, and it is the pane that decides whether it is on.
-
-        Live acquisition advances the mailbox on the session run timer. Replay stops
-        that timer, so after submit the pane must be ticked here — otherwise the frame
-        sits pending and later submits are skipped (``has_pending_frame``). The overlay
-        policy is the open session's ``paint_policy``, so 3D arrows share the 2D canvas's
-        grid and threshold (including the box painter's 2 px floor).
+        Replay (``advance=\"flush\"``) applies the result's ``paint_policy`` and the
+        sensor-type gate, then flushes compose because the run timer is stopped.
+        Live (``advance=\"tick\"``) only submits; the 16 ms timer composes.
         """
-        session = self.replay_ctl.available_result()
-        provenance = getattr(getattr(session, "reader", None), "provenance", None)
-        result_type = str(getattr(provenance, "sensor_type", "") or "").strip()
-        if result_type and result_type != self.sensor_picker.sensor_type():
-            # The old replay stays inspectable after a sensor switch, but its
-            # depth grid must never be submitted to the new sensor's 3D scene.
-            return
+        if advance == "flush":
+            session = self.replay_ctl.available_result()
+            provenance = getattr(getattr(session, "reader", None), "provenance", None)
+            result_type = str(getattr(provenance, "sensor_type", "") or "").strip()
+            if result_type and result_type != self.sensor_picker.sensor_type():
+                # The old replay stays inspectable after a sensor switch, but its
+                # depth grid must never be submitted to the new sensor's 3D scene.
+                return
         view = self.mesh3d_panel.view
         if view is None:
             return
-        self._connect_analysis_display(self.mesh3d_panel)
-        policy = None
-        replay = getattr(self, "replay_ctl", None)
-        if replay is not None:
-            policy = replay._session_policy()
-        view.set_overlay_policy(policy)
+        if advance == "flush":
+            self._connect_analysis_display(self.mesh3d_panel)
+            policy = overlay_policy
+            if policy is None:
+                replay = getattr(self, "replay_ctl", None)
+                if replay is not None:
+                    policy = replay._session_policy()
+            view.set_overlay_policy(policy)
+        elif overlay_policy is not None:
+            view.set_overlay_policy(overlay_policy)
         view.submit_packet(packet)
-        self._tick_analysis_3d()
+        if advance == "flush":
+            self._tick_analysis_3d()
 
     def _tick_analysis_3d(self) -> None:
         """Compose and present the analysis frame while replay owns the image.

apps/studio/src/orisys_studio/replay_analysis.py

@@ -195,6 +195,9 @@ class AnalysisSession:
         self._domain_hw: tuple[int, int] | None = None
         self._cache_id: int | None = None
         self._cache: AnalysedFrame | None = None
+        #: Session-scoped UV unroll / box stitch for overlay bases (lazy).
+        self._overlay = None
+        self._overlay_failed = False
 
     # ------------------------------------------------------------------ identity
     @property
@@ -381,8 +384,46 @@ class AnalysisSession:
             yield self.frame(int(frame_id))
 
     # ------------------------------------------------------------------ packets
-    def packet(self, frame: AnalysedFrame, *, t_rel_s: float | None = None) -> SdkPacket:
-        """One frame in the shape the 3D pane's producer consumes.
+    def overlay_base(
+        self, video_bgr: np.ndarray, *, frame_id: int | None = None
+    ) -> np.ndarray | None:
+        """The live-shaped processed image for this camera frame, or ``None``.
+
+        Opens a session-scoped projector from the result's provenance on first use.
+        Failure is sticky for the session: overlay views then report capture
+        unavailable rather than falling back to a resized fisheye.
+        """
+        if self._overlay_failed:
+            return None
+        if self._overlay is None:
+            from orisys_app_shared.analysis.overlay_base import OverlayBaseProjector
+
+            self._overlay = OverlayBaseProjector.open_from_provenance(
+                self.reader.provenance
+            )
+            if self._overlay is None:
+                self._overlay_failed = True
+                return None
+        return self._overlay.project(video_bgr, frame_id=frame_id)
+
+    def close(self) -> None:
+        """Release the overlay projector; the reader is closed by :class:`ResultLibrary`."""
+        overlay, self._overlay = self._overlay, None
+        if overlay is not None:
+            try:
+                overlay.close()
+            except Exception:  # noqa: BLE001
+                logger.debug("overlay projector close skipped", exc_info=True)
+
+    def packet(
+        self,
+        frame: AnalysedFrame,
+        *,
+        t_rel_s: float | None = None,
+        processed_frame: np.ndarray | None = None,
+        raw_frame: np.ndarray | None = None,
+    ) -> SdkPacket:
+        """One frame in the shape the 2D sink and 3D producer both consume.
 
         The pane is fed through its ordinary path — it snapshots a packet — so a
         replay's figures go through the same adapter, the same domain latch and the
@@ -390,14 +431,20 @@ class AnalysisSession:
         else would make "the pane looks the same in every mode" an accident of two code
         paths happening to agree.
 
+        ``processed_frame`` is the UV-unrolled or stitched base when the overlay view
+        has one; without it the stored black placeholder remains (pure-colour arrows
+        replace that canvas anyway).
+
         The forces are zero and ``forces_valid`` is ``False``: the result stores no
         force, ``forces.csv`` is where that measurement lives, and a zero here would be
         a measurement nothing made.
         """
         moment = float(frame.t_rel_s if t_rel_s is None else t_rel_s)
+        processed = frame.base_bgr if processed_frame is None else processed_frame
+        raw = frame.base_bgr if raw_frame is None else raw_frame
         return SdkPacket(
-            raw_frame=frame.base_bgr,
-            processed_frame=frame.base_bgr,
+            raw_frame=raw,
+            processed_frame=processed,
             timestamp=moment,
             mono_t=moment,
             fps=0.0,
@@ -597,6 +644,10 @@ class ResultLibrary:
     def close(self) -> None:
         session, self._session = self._session, None
         if session is not None:
+            try:
+                session.close()
+            except Exception:  # noqa: BLE001 - releasing is best effort
+                logger.debug("could not close the analysis session", exc_info=True)
             try:
                 session.reader.close()
             except Exception:  # noqa: BLE001 - releasing is best effort

apps/studio/src/orisys_studio/replay_controller.py

@@ -1037,8 +1037,8 @@ class ReplayController(QObject):
         picture stays in the same selector, one step away, and the recompute switch is
         not involved.
 
-        The first processed view is arrows over the captured frame: the camera picture
-        gives immediate context. A derived selection the operator already chose is left
+        The first processed view is arrows over the unrolled / stitched base: the same
+        texture live uses. A derived selection the operator already chose is left
         alone — that mode is not this method's to override.
         """
         current = str(getattr(self._image_panel, "view_mode", lambda: "")() or "")
@@ -1249,32 +1249,18 @@ class ReplayController(QObject):
         return held
 
     # ------------------------------------------------------------------ drawing
-    def _captured_base_for(self, frame) -> np.ndarray | None:
-        """The camera picture at the result's domain size, or ``None`` when unavailable.
+    def _processed_base_for(self, frame, session) -> np.ndarray | None:
+        """The live-shaped processed image under the arrows, or ``None``.
 
         Stored analysis frames keep a black placeholder as ``base_bgr``: the pass does
-        not embed the video. Overlay views need the decoded frame resized onto the
-        measurement grid — painting the stitch grid onto a larger camera frame would
-        leave the arrows in a corner (see :meth:`AnalysisSession.domain_hw`).
+        not embed the video. Overlay views need the same UV unroll / box stitch live
+        publishes as ``processed_frame`` — a plain resize of the fisheye leaves arrows
+        on the wrong texture.
         """
         video = self._engine.video_frame_bgr()
-        if video is None:
+        if video is None or session is None:
             return None
-        height, width = (int(frame.flow.shape[0]), int(frame.flow.shape[1]))
-        image = np.asarray(video)
-        if image.ndim == 2:
-            import cv2
-
-            image = cv2.cvtColor(image, cv2.COLOR_GRAY2BGR)
-        elif image.ndim == 3 and image.shape[2] == 4:
-            import cv2
-
-            image = cv2.cvtColor(image, cv2.COLOR_BGRA2BGR)
-        if int(image.shape[0]) == height and int(image.shape[1]) == width:
-            return np.ascontiguousarray(image)
-        import cv2
-
-        return cv2.resize(image, (width, height), interpolation=cv2.INTER_AREA)
+        return session.overlay_base(video, frame_id=int(frame.frame_id))
 
     def _analysis_image_frame(
         self, frame, *, source: str, base_bgr: np.ndarray | None = None
@@ -1364,23 +1350,36 @@ class ReplayController(QObject):
             else:
                 frame = None
             if frame is not None:
-                captured = self._captured_base_for(frame)
-                if wanted == ARROW_STITCHED and captured is None:
-                    # Overlay without a camera picture is a black canvas with dots — say
-                    # so instead of implying the capture is missing from the result.
+                processed = self._processed_base_for(frame, session)
+                if wanted == ARROW_STITCHED and processed is None:
+                    # Overlay without the live-shaped base is a black canvas with dots —
+                    # say so instead of painting a resized fisheye under UV-domain arrows.
                     self._image_panel.clear_preview(t("panels.arrow_capture_unavailable"))
-                    self._host.show_analysis_packet(session.packet(frame))
-                    return
-                self._host.show_frame(
-                    self._analysis_image_frame(
-                        frame,
-                        source=SOURCE_ANALYSIS if self.analysis_active() else SOURCE_REPLAY,
-                        base_bgr=captured,
+                    self._host.deliver_measurement(
+                        session.packet(frame),
+                        advance="flush",
+                        arrow_policy=self._session_policy(),
+                        image_source=(
+                            SOURCE_ANALYSIS if self.analysis_active() else SOURCE_REPLAY
+                        ),
+                        paint_2d=False,
                     )
+                    return
+                raw = self._engine.video_frame_bgr()
+                packet = session.packet(
+                    frame,
+                    processed_frame=processed,
+                    raw_frame=None if raw is None else np.asarray(raw),
+                )
+                # One cursor, one packet: 2D then 3D on the shared deliver path.
+                self._host.deliver_measurement(
+                    packet,
+                    advance="flush",
+                    arrow_policy=self._session_policy(),
+                    image_source=(
+                        SOURCE_ANALYSIS if self.analysis_active() else SOURCE_REPLAY
+                    ),
                 )
-                # The same frame, in the shape the 3D pane's producer consumes: one
-                # cursor, two figures, one frame id.
-                self._host.show_analysis_packet(session.packet(frame))
                 return
         image = self._engine.video_frame_bgr()
         if image is None:

apps/studio/src/orisys_studio/session_controller.py

@@ -58,12 +58,14 @@ class SessionController(QObject):
         self,
         *,
         recording: Any,
-        packet_for_3d: Callable[[Any], None],
         packet_sink: Callable[[Any], None] | None = None,
         sensor_type: str = "box",
+        packet_for_3d: Callable[[Any], None] | None = None,
     ) -> None:
         super().__init__()
         self._recording = recording
+        #: Legacy optional second sink. Live 3D is delivered on the GUI tick with 2D;
+        #: keep the parameter so older call sites that still pass a noop do not break.
         self._packet_for_3d = packet_for_3d
         #: The record channel's sink. It defaults to this object's own method; the
         #: window may hand in its own bound method instead, because the tests and the
@@ -256,19 +258,20 @@ class SessionController(QObject):
         self.wire_sinks()
 
     def wire_sinks(self) -> None:
-        """Register the record channel and the 3D pane on both workers (idempotent)."""
+        """Register the record channel on both workers (idempotent).
+
+        3D shares the GUI deliver path with 2D (``deliver_measurement``), so it is
+        not a second acquisition-thread sink.
+        """
         for worker in (self._box_worker, self._finger_worker):
             if worker is None:
                 continue
             worker.add_sink(self._packet_sink)
-            # The 3D pane is a second sink on the same thread. It is registered even
-            # while the pane is off, because a sink whose cost depends on the click
-            # order is worse than a view that is told to do nothing (the view's own
-            # enabled flag).
-            worker.add_sink(self._packet_for_3d)
+            if self._packet_for_3d is not None:
+                worker.add_sink(self._packet_for_3d)
 
     def detach_sinks(self) -> None:
-        """Unregister both sinks. Called on the way out, before Qt tears widgets down.
+        """Unregister sinks. Called on the way out, before Qt tears widgets down.
 
         A worker that is still winding down must not keep a reference to the window
         (and through it to widgets that no longer exist).
@@ -277,7 +280,8 @@ class SessionController(QObject):
             if worker is None or not hasattr(worker, "remove_sink"):
                 continue
             worker.remove_sink(self._packet_sink)
-            worker.remove_sink(self._packet_for_3d)
+            if self._packet_for_3d is not None:
+                worker.remove_sink(self._packet_for_3d)
 
     def worker_for(self, sensor_type: str) -> Any:
         self.ensure_workers()

apps/studio/src/orisys_studio/shell_ports.py

@@ -49,6 +49,16 @@ class ImageSink(Protocol):
 
     def show_analysis_packet(self, packet: Any) -> None: ...
 
+    def deliver_measurement(
+        self,
+        packet: Any,
+        *,
+        advance: str = "tick",
+        arrow_policy: Any = None,
+        image_source: str | None = None,
+        paint_2d: bool = True,
+    ) -> None: ...
+
     def drop_render_marker(self) -> None: ...
 
 

apps/studio/tests/test_replay_analysis.py

@@ -465,6 +465,32 @@ class _Host:
         self.frames.append(frame)
 
     def show_analysis_packet(self, packet) -> None:
+        self.deliver_measurement(packet, advance="flush", paint_2d=False)
+
+    def deliver_measurement(
+        self,
+        packet,
+        *,
+        advance: str = "tick",
+        arrow_policy=None,
+        image_source: str | None = None,
+        paint_2d: bool = True,
+    ) -> None:
+        if paint_2d:
+            from orisys_app_shared.acquisition.image_backend import ImageFrame
+
+            self.frames.append(
+                ImageFrame(
+                    getattr(packet, "processed_frame", None),
+                    flow=getattr(packet, "flow", None),
+                    depth=getattr(packet, "depth", None),
+                    valid_mask=getattr(packet, "valid_mask", None),
+                    source=image_source or "replay",
+                    frame_id=int(getattr(packet, "frame_id", 0) or 0),
+                    arrow_policy=arrow_policy,
+                    result_available=True,
+                )
+            )
         self.analysis_packets.append(packet)
 
     def drop_render_marker(self) -> None:

apps/studio/tests/test_replay_controller.py

@@ -262,6 +262,32 @@ class _Host:
         self.frames.append(frame)
 
     def show_analysis_packet(self, packet) -> None:
+        self.deliver_measurement(packet, advance="flush", paint_2d=False)
+
+    def deliver_measurement(
+        self,
+        packet,
+        *,
+        advance: str = "tick",
+        arrow_policy=None,
+        image_source: str | None = None,
+        paint_2d: bool = True,
+    ) -> None:
+        if paint_2d:
+            from orisys_app_shared.acquisition.image_backend import ImageFrame
+
+            self.frames.append(
+                ImageFrame(
+                    getattr(packet, "processed_frame", None),
+                    flow=getattr(packet, "flow", None),
+                    depth=getattr(packet, "depth", None),
+                    valid_mask=getattr(packet, "valid_mask", None),
+                    source=image_source or "replay",
+                    frame_id=int(getattr(packet, "frame_id", 0) or 0),
+                    arrow_policy=arrow_policy,
+                    result_available=True,
+                )
+            )
         self.analysis_packets.append(packet)
 
     def drop_render_marker(self) -> None:

apps/studio/tests/test_scene3d_view.py

@@ -388,8 +388,8 @@ def _run_session(make_window, record_root, *, with_3d: bool):
     if with_3d:
         view = _RecordingView()
         window.mesh3d_panel.attach_view(view)
-    # With no pane the sink still runs (it is registered on the worker) and does
-    # nothing, which is the case the comparison below is about.
+    # 3D is submitted on the GUI deliver path (same tick as 2D), not as an
+    # acquisition-thread sink — with or without a pane attached.
     window.toolbar.btn_record.setChecked(True)
     for index in range(96):
         stuck.emit(ui_check._fake_packet(index, mono_t=index / 30.0))
@@ -427,20 +427,20 @@ def test_the_3d_consumer_cannot_change_the_record(make_window, next_record_root)
     assert "t_rel_s" in header and len(with_3d_csv.splitlines()) > 10
 
 
-def test_the_3d_sink_is_registered_and_inert_when_the_pane_is_off(make_window, next_record_root):
-    """A sink that has to be added and removed around a toggle is a state machine."""
+def test_live_3d_is_not_an_acquisition_thread_sink(make_window, next_record_root):
+    """3D shares the GUI deliver path with 2D; only the record channel is a sink."""
     import orisys_studio.app_window as app_module
 
     window, stuck = _running_window(make_window)
     app_module.recordings_dir = lambda: next_record_root()
     try:
-        assert window._on_packet_recorded in stuck.sinks()
-        assert window._on_packet_for_3d in stuck.sinks(), (
-            "the 3D sink must be registered with the worker, not attached per toggle"
+        assert stuck.sinks() == (window._on_packet_recorded,), (
+            "live 3D must not register a second acquisition-thread sink"
         )
         assert window.mesh3d_panel.view is None, "a box sensor must not build a view"
         for index in range(10):
             stuck.emit(ui_check._fake_packet(index))
+            window._on_run_tick()
         assert window.session_store.count == 10
         assert window.mesh3d_panel.view is None
     finally: