diff --git a/src/kiri/app/conf/defaults.js b/src/kiri/app/conf/defaults.js
index 7867d695..f5be2e4c 100644
--- a/src/kiri/app/conf/defaults.js
+++ b/src/kiri/app/conf/defaults.js
@@ -1003,6 +1003,7 @@ export const conf = {
         widget: {},
         // legacy localStorage settings (like octo print)
         local: {
+            'model.opacity': 1.0,
             'model.edges': false,
             'cam.anim.trans': true,
             'cam.anim.model': false,
diff --git a/src/kiri/app/function.js b/src/kiri/app/function.js
index ac3c4904..2a6f5e0d 100644
--- a/src/kiri/app/function.js
+++ b/src/kiri/app/function.js
@@ -290,7 +290,7 @@ function prepareSlices(callback, scale = 1, offset = 0) {
             if (scale === 1) {
                 // clear wireframe
                 const scheme = getColorScheme();
-                widget.setWireframe(false, scheme.wireframe.color, scheme.wireframe.opacity);
+                widget._setWireframe(false, scheme.wireframe.color, scheme.wireframe.opacity);
                 widget.setOpacity(camOrLaser ? scheme.views.SLICE.sliced_opacity ?? 0.2 : scheme.views.PREVIEW?.sliced_opacity ?? 0.0);
                 widget.setColor(scheme.widget.deselected);
                 api.hide.alert(alert);
diff --git a/src/kiri/app/init/sync.js b/src/kiri/app/init/sync.js
index b507c121..a5ed5915 100644
--- a/src/kiri/app/init/sync.js
+++ b/src/kiri/app/init/sync.js
@@ -54,6 +54,19 @@ export async function init_sync() {
         console.log({octoprint:ohost});
     }
 
+    // One-time migration: Initialize model.opacity from existing ghosting state
+    if (api.local.getFloat('model.opacity') === null) {
+        const wireframeOpacity = api.local.getFloat('model.wireframe.opacity');
+        const wireframe = api.local.getBoolean('model.wireframe', false);
+
+        // If ghosting was enabled (wireframe off, opacity < 1), preserve it
+        if (!wireframe && wireframeOpacity !== null && wireframeOpacity < 1) {
+            api.local.set('model.opacity', wireframeOpacity);
+        } else {
+            api.local.set('model.opacity', 1.0);
+        }
+    }
+
     // load workspace from url
     if (SETUP.wrk) {
         set_ctrl.import_url(`${proto}//${SETUP.wrk[0]}`, false);
@@ -262,9 +275,26 @@ function setup_keybd_nav() {
 
     // rendering options
     $('render-edges').onclick = () => { api.view.set_edges({ toggle: true }); api.conf.save() };
-    $('render-ghost').onclick = () => { api.view.set_wireframe(false, 0, api.view.is_arrange() ? 0.4 : 0.25); };
-    $('render-wire').onclick = () => { api.view.set_wireframe(true, 0, api.space.is_dark() ? 0.25 : 0.5); };
-    $('render-solid').onclick = () => { api.view.set_wireframe(false, 0, 1); };
+    $('render-ghost').onclick = () => {
+        const opacity = api.view.is_arrange() ? 0.4 : 0.25;
+        api.view.set_wireframe(false);
+        api.visuals.set_opacity(opacity);
+        // Also save to old key for backwards compatibility
+        api.local.set('model.wireframe.opacity', opacity);
+        api.conf.save();
+    };
+    $('render-wire').onclick = () => {
+        api.view.set_wireframe(true, 0, api.space.is_dark() ? 0.25 : 0.5);
+        api.visuals.set_opacity(1.0);
+        api.conf.save();
+    };
+    $('render-solid').onclick = () => {
+        api.view.set_wireframe(false);
+        api.visuals.set_opacity(1.0);
+        // Also save to old key for backwards compatibility
+        api.local.set('model.wireframe.opacity', 1.0);
+        api.conf.save();
+    };
     $('mesh-export-stl').onclick = () => { settingsOps.export_objects('stl') };
     $('mesh-export-obj').onclick = () => { settingsOps.export_objects('obj') };
     $('mesh-merge').onclick = selection.merge;
diff --git a/src/kiri/app/keyboard.js b/src/kiri/app/keyboard.js
index c68df9f6..7d6e49fc 100644
--- a/src/kiri/app/keyboard.js
+++ b/src/kiri/app/keyboard.js
@@ -264,7 +264,7 @@ class KeyboardControl {
 
         let api = this.#api;
         let isWireframe = api.local.getBoolean('model.wireframe');
-        let isGhost = api.local.getFloat('model.wireframe.opacity') < 1;
+        let isGhost = !isWireframe && (api.local.getFloat('model.opacity') ?? 1.0) < 1;
 
         switch (evt.keyCode) {
             case this.#cca('`'): this.#api.show.slices(0); break;
diff --git a/src/kiri/app/local.js b/src/kiri/app/local.js
index 9d5d3335..3afba384 100644
--- a/src/kiri/app/local.js
+++ b/src/kiri/app/local.js
@@ -38,7 +38,12 @@ export const local = {
     get: (key) => localGet(key),
     getItem: (key) => localGet(key),
     getInt: (key) => parseInt(localGet(key)),
-    getFloat: (key) => parseFloat(localGet(key)),
+    getFloat: (key) => {
+        const val = localGet(key);
+        if (val === undefined || val === null) return null;
+        const parsed = parseFloat(val);
+        return isNaN(parsed) ? null : parsed;
+    },
     getBoolean: localGetBoolean,
     toggle: (key, val, def) => {
         return localSet(key, val ?? !localGetBoolean(key, def));
diff --git a/src/kiri/app/state/visual.js b/src/kiri/app/state/visual.js
index 81807d0e..ca2f6429 100644
--- a/src/kiri/app/state/visual.js
+++ b/src/kiri/app/state/visual.js
@@ -190,8 +190,8 @@ class VisualStateManager {
      */
     setVisualState({ edges, wires, opacity }) {
         this.widget.cache.vizstate = this.getVisualState();
-        this.widget.setEdges(edges ?? false);
-        this.widget.setWireframe(wires ?? false);
+        this.widget._setEdges(edges ?? false);
+        this.widget._setWireframe(wires ?? false);
         if (opacity !== undefined) {
             this.widget.setOpacity(opacity);
         }
diff --git a/src/kiri/app/view-mode.js b/src/kiri/app/view-mode.js
index dac5e95d..dbb87dc9 100644
--- a/src/kiri/app/view-mode.js
+++ b/src/kiri/app/view-mode.js
@@ -54,28 +54,27 @@ function setViewMode(mode) {
             api.visuals.update_speeds();
             api.visuals.set_visible_layer();
             api.visuals.set_widget_visibility(true);
-            api.view.set_edges(api.local.getBoolean('model.edges'));
-            api.view.set_wireframe(api.local.getBoolean('model.wireframe'));
-            // Only set opacity to 1 if wireframe is disabled
-            if (!api.local.getBoolean('model.wireframe')) {
-                api.widgets.setOpacity(1);
-            }
+            // Restore global visual state (opacity, edges, wireframe)
+            api.widgets.each(w => w.applyGlobalVisualState());
             break;
         case VIEWS.SLICE:
             $('act-slice').classList.add('selected');
             api.visuals.update_speeds();
             api.visuals.update_slider_max();
             api.visuals.set_widget_visibility(true);
-            !isCAM && api.view.set_edges(false);
+            // Hide edges without persisting (preserve user preference)
+            !isCAM && api.view.set_edges(false, false);
             break;
         case VIEWS.PREVIEW:
             $('act-preview').classList.add('selected');
             api.visuals.set_widget_visibility(true);
-            !isCAM && api.view.set_edges(false);
+            // Hide edges without persisting (preserve user preference)
+            !isCAM && api.view.set_edges(false, false);
             break;
         case VIEWS.ANIMATE:
             $('act-animate').classList.add('selected');
-            !isCAM && api.view.set_edges(false);
+            // Hide edges without persisting (preserve user preference)
+            !isCAM && api.view.set_edges(false, false);
             break;
         default:
             console.log("invalid view mode: "+mode);
diff --git a/src/kiri/app/visuals.js b/src/kiri/app/visuals.js
index b34e8c41..a5f0af73 100644
--- a/src/kiri/app/visuals.js
+++ b/src/kiri/app/visuals.js
@@ -114,6 +114,25 @@ function setVisibleLayer(h, l) {
     showSlices();
 }
 
+/**
+ * Set global opacity for all widgets.
+ * Updates material opacity for all widgets and persists to localStorage.
+ * This is the primary opacity control - all widgets share the same opacity.
+ * @param {number} value - Opacity value (0.0 to 1.0)
+ */
+function setOpacity(value) {
+    api.local.set('model.opacity', value);
+    // Also update old key for backwards compatibility
+    api.local.set('model.wireframe.opacity', value);
+    api.widgets.each(w => {
+        const mat = w.getMaterial();
+        mat.opacity = value;
+        mat.transparent = value < 1.0;
+        mat.visible = value > 0.0;
+    });
+    space.update();
+}
+
 /**
  * Set wireframe rendering mode for all widgets.
  * Updates 3D scene after applying to all widgets.
@@ -144,7 +163,7 @@ function setWireframe(bool, color, opacity) {
         const saved = api.local.getFloat('model.wireframe.opacity');
         opacity = saved !== null ? saved : (api.space.is_dark() ? 0.25 : 0.5);
     }
-    api.widgets.each((w) => { w.setWireframe(bool, color, opacity) });
+    api.widgets.each((w) => { w._setWireframe(bool, color, opacity) });
     space.update();
 }
 
@@ -154,15 +173,18 @@ function setWireframe(bool, color, opacity) {
  * Otherwise sets edge visibility to bool value.
  * Persists state to local storage and updates scene.
  * @param {boolean|object} bool - Enable/disable edges, or {toggle: true} to toggle
+ * @param {boolean} [persist=true] - Whether to save state to local storage
  */
-function setEdges(bool) {
+function setEdges(bool, persist = true) {
     if (bool && bool.toggle) {
         api.local.toggle('model.edges');
+        bool = api.local.getBoolean('model.edges');
     } else {
-        api.local.set('model.edges', bool);
+        if (persist) {
+            api.local.set('model.edges', bool);
+        }
     }
-    bool = api.local.getBoolean('model.edges');
-    api.widgets.each(w => w.setEdges(bool));
+    api.widgets.each(w => w._setEdges(bool));
     space.update();
 }
 
@@ -188,19 +210,8 @@ function updateSliderMax(set) {
  */
 function hideSlices() {
     STACKS.clear();
-    // Restore saved wireframe state instead of forcing wireframe off
-    const wireframe = api.local.getBoolean('model.wireframe');
-    const color = api.local.getInt('model.wireframe.color') || 0;
-    const saved = api.local.getFloat('model.wireframe.opacity');
-    const scheme = getColorScheme();
-    const opacity = saved !== null ? saved : (scheme.views.ARRANGE?.model_opacity ?? 1.0);
-
-    if (wireframe) {
-        api.widgets.each(widget => widget.setWireframe(wireframe, color, opacity));
-    } else {
-        api.widgets.setOpacity(opacity);
-        api.widgets.each(widget => widget.setWireframe(false));
-    }
+    // Restore global visual state
+    api.widgets.each(widget => widget.applyGlobalVisualState());
 }
 
 /**
@@ -284,7 +295,7 @@ function updateStackLabelState() {
 
 /**
  * Apply saved visual state to a widget.
- * Restores edges and wireframe settings from local storage.
+ * Delegates to widget's applyGlobalVisualState method.
  * Only applies in ARRANGE view mode.
  * @param {Widget} widget - Widget to apply visual state to
  */
@@ -294,25 +305,7 @@ function applyVisualState(widget) {
     if (viewMode !== VIEWS.ARRANGE) {
         return;
     }
-    const edges = api.local.getBoolean('model.edges');
-    const wireframe = api.local.getBoolean('model.wireframe');
-
-    // Always apply edges setting
-    if (edges) {
-        widget.setEdges(edges);
-    }
-
-    // Apply wireframe and its associated opacity
-    const color = api.local.getInt('model.wireframe.color') || 0;
-    const saved = api.local.getFloat('model.wireframe.opacity');
-    const opacity = saved !== null ? saved : 1;
-
-    if (wireframe) {
-        widget.setWireframe(wireframe, color, opacity);
-    } else if (saved !== null) {
-        // Even if wireframe is off, restore the saved opacity
-        widget.setOpacity(opacity);
-    }
+    widget.applyGlobalVisualState();
 }
 
 /**
@@ -381,6 +374,7 @@ export const visuals = {
     hide_slices: hideSlices,
     hide_slider: hideSlider,
     set_edges: setEdges,
+    set_opacity: setOpacity,
     set_progress: setProgress,
     set_visible_layer: setVisibleLayer,
     set_widget_visibility: setWidgetVisibility,
diff --git a/src/kiri/app/widget.js b/src/kiri/app/widget.js
index a6ae0a8a..487fded3 100644
--- a/src/kiri/app/widget.js
+++ b/src/kiri/app/widget.js
@@ -148,9 +148,12 @@ class Widget extends WidgetCore {
      */
     setVisualState({ edges, wires, opacity}) {
         this.cache.vizstate = this.getVisualState();
-        this.setEdges(edges ?? false);
-        this.setWireframe(wires ?? false);
-        this.setOpacity(opacity ?? 1);
+        this._setEdges(edges ?? false);
+        this._setWireframe(wires ?? false);
+        // Only set opacity if explicitly provided (don't default to 1)
+        if (opacity !== undefined) {
+            this.setOpacity(opacity);
+        }
     }
 
     /**
@@ -169,6 +172,39 @@ class Widget extends WidgetCore {
         }
     }
 
+    /**
+     * Apply global visual state from localStorage to this widget.
+     * Reads opacity, edges, and wireframe settings from global config.
+     * This is the primary method for syncing widget appearance with global preferences.
+     */
+    applyGlobalVisualState() {
+        if (!this.api) {
+            return;
+        }
+
+        const material = this.getMaterial();
+
+        // Apply global opacity
+        const opacity = this.api.local.getFloat('model.opacity') ?? 1.0;
+        material.opacity = opacity;
+        material.transparent = opacity < 1.0;
+        material.visible = opacity > 0.0;
+
+        // Apply global edges
+        const edges = this.api.local.getBoolean('model.edges', false);
+        this._setEdges(edges);
+
+        // Apply global wireframe
+        const wireframe = this.api.local.getBoolean('model.wireframe', false);
+        if (wireframe) {
+            const color = this.api.local.getInt('model.wireframe.color') || 0;
+            const wfOpacity = this.api.local.getFloat('model.wireframe.opacity') ?? 0.5;
+            this._setWireframe(true, color, wfOpacity);
+        } else {
+            this._setWireframe(false);
+        }
+    }
+
     /**
      * Set material opacity
      */
@@ -185,16 +221,23 @@ class Widget extends WidgetCore {
         }
     }
 
+    /**
+     * Set edge rendering - public interface for core widget rotation/scale
+     * Delegates to internal _setEdges method
+     */
     setEdges(set) {
-        clearTimeout(this._setimer);
-        if (set === true && this.outline) {
-            this._setimer = setTimeout(() => this._setEdges(set), 10);
-        } else {
-            this._setEdges(set);
-        }
+        this._setEdges(set);
     }
 
+    /**
+     * Set edge rendering (internal method - use api.view.set_edges for global control)
+     * @private
+     */
     _setEdges(set) {
+        this.__setEdges(set);
+    }
+
+    __setEdges(set) {
         if (!(this.api && this.api.conf)) {
             // missing api features in engine mode
             return;
@@ -253,15 +296,26 @@ class Widget extends WidgetCore {
     }
 
     /**
-     * Set wireframe rendering
+     * Set wireframe rendering - public interface for core widget rotation/scale
+     * Delegates to internal _setWireframe method
      */
     setWireframe(set, color, opacity) {
+        this._setWireframe(set, color, opacity);
+    }
+
+    /**
+     * Set wireframe rendering (internal method - use api.view.set_wireframe for global control)
+     * @private
+     */
+    _setWireframe(set, color, opacity) {
         if (!(this.api && this.api.conf)) {
             // missing api features in engine mode
             return;
         }
         let mesh = this.mesh,
             widget = this;
+        // Save current opacity before removing wire
+        const currentOpacity = this.getMaterial().opacity;
         if (this.wire) {
             this.setOpacity(solid_opacity);
             mesh.remove(this.wire);
@@ -287,6 +341,9 @@ class Widget extends WidgetCore {
         }
         if (opacity !== undefined) {
             widget.setOpacity(opacity);
+        } else if (!set && this.wire === null) {
+            // Restore original opacity when removing wireframe without explicit opacity
+            widget.setOpacity(currentOpacity);
         }
     }