三维显示与二维共用深度色标，配置名改为 Finger

箭头阈值写入设置；去掉网格告警。三维色标改为立刻采用二维量程（不再 P5/P95 缓变）。选择器显示 Finger。已用 pane UI、shared-scale 与 catalog 单测验证。

apps/studio/src/orisys_studio/scene3d/gl_backend.py

@@ -263,6 +263,24 @@ def shader_source(profile: Profile, program: str) -> tuple[str, str]:
     return header + vertex, header + body
 
 
+def _finite_minmax(scalar, valid) -> tuple[float, float] | None:
+    """Finite minimum and maximum — the same interval ``FrameView.frame_depth_span`` uses."""
+    import numpy as np
+
+    values = np.asarray(scalar, dtype=np.float64).reshape(-1)
+    mask = np.asarray(valid, dtype=bool).reshape(-1)
+    if values.size != mask.size:
+        return None
+    usable = values[mask & np.isfinite(values)]
+    if usable.size == 0:
+        return None
+    lo = float(np.min(usable))
+    hi = float(np.max(usable))
+    if hi <= lo:
+        hi = lo + 1.0
+    return lo, hi
+
+
 def _valid_scalar_range(
     scalar, valid, *, signed: bool = False
 ) -> tuple[float, float] | None:
@@ -379,6 +397,10 @@ def _field_scalar_range(
         hi = float(shared_depth_scale[1])
         if hi > lo and not (math.isnan(lo) or math.isnan(hi)):
             return lo, hi
+    if quantity == "depth_response":
+        # Same interval as the 2D canvas (finite min/max). A P5/P95 blend here
+        # made the 3D colour bar crawl toward a different number than the 2D label.
+        return _finite_minmax(field.scalar, field.valid)
     measured = _valid_scalar_range(
         field.scalar,
         field.valid,

apps/studio/src/orisys_studio/scene3d/panel.py

@@ -159,6 +159,9 @@ class ThreeDPanel(QFrame):
         #: prefs (or the dataclass defaults) so a colour-scale click cannot reset them.
         self._flow_grid_spacing = 10
         self._max_arrows = 400
+        #: Depth colour span published by the 2D canvas. Shown here immediately so the
+        #: two legends do not wait on the next GL paint (which is rate-limited).
+        self._shared_depth_span: tuple[float, float] | None = None
 
         root = QVBoxLayout(self)
         root.setContentsMargins(8, 6, 8, 6)
@@ -490,7 +493,16 @@ class ThreeDPanel(QFrame):
         if quantity.startswith("scene3d."):
             quantity = descriptor.quantity
         quality = t(f"scene3d.quality_{descriptor.quality}")
-        if effective is None or effective.scale_mode == "":
+        shared = (
+            self._shared_depth_span
+            if str(descriptor.quantity) == "depth_response"
+            else None
+        )
+        if shared is not None:
+            lo, hi = shared
+        elif effective is not None and effective.scale_mode:
+            lo, hi = effective.scale_lower, effective.scale_upper
+        else:
             self._set_legend(
                 t(
                     "scene3d.legend",
@@ -503,7 +515,7 @@ class ThreeDPanel(QFrame):
             return
         mode = t(
             "scene3d.legend_auto"
-            if effective.scale_mode == "automatic"
+            if (effective is None or effective.scale_mode != "fixed")
             else "scene3d.legend_fixed"
         )
         self._set_legend(
@@ -512,15 +524,25 @@ class ThreeDPanel(QFrame):
                 quantity=quantity,
                 unit=descriptor.unit,
                 mode=mode,
-                # Three significant digits: the footer is one line, and "0.033 – 0.90"
-                # says as much as "0.03337 – 0.8993" while leaving room for the rest.
-                lower=f"{effective.scale_lower:.3g}",
-                upper=f"{effective.scale_upper:.3g}",
+                lower=self._format_bound(lo),
+                upper=self._format_bound(hi),
                 quality=quality,
             )
         )
         self.legend_label.setVisible(self._show_diagnostics)
 
+    def set_shared_depth_scale(self, span: tuple[float, float] | None) -> None:
+        """Adopt the 2D canvas's depth colour span and refresh the legend now."""
+        if span is None:
+            self._shared_depth_span = None
+        else:
+            self._shared_depth_span = (float(span[0]), float(span[1]))
+        self._render_scale_bounds()
+        self._render_legend()
+
+    def _format_bound(self, value: float) -> str:
+        return f"{float(value):.3f}"
+
     def _render_scale_bounds(self) -> None:
         """Show only the numeric bounds needed to read the color ramp."""
         descriptor = self._descriptor
@@ -531,16 +553,20 @@ class ThreeDPanel(QFrame):
         upper = ""
         mode = str(self.scale_combo.currentData() or "fixed")
         effective = self._effective_scale
-        if visible and mode == "fixed":
-            lower = f"{self.lower_spin.value():.3g}"
-            upper = f"{self.upper_spin.value():.3g}"
+        quantity = "" if descriptor is None else str(descriptor.quantity)
+        if visible and quantity == "depth_response" and self._shared_depth_span is not None:
+            lower = self._format_bound(self._shared_depth_span[0])
+            upper = self._format_bound(self._shared_depth_span[1])
+        elif visible and mode == "fixed":
+            lower = self._format_bound(self.lower_spin.value())
+            upper = self._format_bound(self.upper_spin.value())
         elif (
             visible
             and effective is not None
             and effective.scale_mode == "automatic"
         ):
-            lower = f"{effective.scale_lower:.3g}"
-            upper = f"{effective.scale_upper:.3g}"
+            lower = self._format_bound(effective.scale_lower)
+            upper = self._format_bound(effective.scale_upper)
         self.scale_lower_label.setText(lower)
         self.scale_upper_label.setText(upper)
         self.scale_lower_label.setVisible(visible)

apps/studio/src/orisys_studio/scene3d/view.py

@@ -317,6 +317,8 @@ class Scene3DView(QWidget):
         """Colour depth with the 2D canvas's latched ``(lo, hi)``."""
         if self._widget is not None:
             self._widget.set_shared_depth_scale(span)
+        if self._panel is not None:
+            self._panel.set_shared_depth_scale(span)
 
     def set_theme(self, theme: str) -> None:
         """Adopt the application theme's colour ramp.