diff --git a/src/geo/polygons.js b/src/geo/polygons.js
index 41102373..8a5d7947 100644
--- a/src/geo/polygons.js
+++ b/src/geo/polygons.js
@@ -481,7 +481,11 @@ export function union(polys, minarea, all, opt = {}) {
     }
 
     for (i=0; i<out.length; i++) {
-        if (out[i]) uset.push(out[i]);
+        if (out[i]) {
+            if (!minarea || out[i].area() >= minarea) {
+                uset.push(out[i]);
+            }
+        }
     }
 
     opt.changes = length(uset) - lpre;
diff --git a/src/kiri/app/keyboard.js b/src/kiri/app/keyboard.js
index d0e825c9..22bb4be1 100644
--- a/src/kiri/app/keyboard.js
+++ b/src/kiri/app/keyboard.js
@@ -258,6 +258,7 @@ class KeyboardControl {
             switch (evt.key) {
                 // case 'g': return this.#api.group.merge();
                 // case 'u': return this.#api.group.split();
+                case 'w': return $('render-edges').onclick();
             }
         }
 
@@ -366,9 +367,6 @@ class KeyboardControl {
             case this.#cca('o'): // tools
                 this.#api.show.tools();
                 break;
-            case this.#cca('c'): // local devices
-                this.#api.show.local();
-                break;
             case this.#cca('v'): // toggle single slice view mode
                 if (this.#api.view.get() === this.#VIEWS.ARRANGE) {
                     this.#api.space.set_focus(this.#selection.widgets());
@@ -399,6 +397,12 @@ class KeyboardControl {
                     this.#api.view.set(this.#VIEWS.ARRANGE);
                 }
                 break;
+            case this.#cca('w'): // set ghost
+                $('render-ghost').onclick();
+                break;
+            case this.#cca('W'): // set wireframe
+                $('render-wire').onclick();
+                break;
             default:
                 this.#onUnhandledKey(evt);
                 handled = false;
diff --git a/src/kiri/app/visuals.js b/src/kiri/app/visuals.js
index 1b988120..7a351f06 100644
--- a/src/kiri/app/visuals.js
+++ b/src/kiri/app/visuals.js
@@ -112,7 +112,7 @@ function setVisibleLayer(h, l) {
  * @param {number} [opacity] - Optional wireframe opacity
  */
 function setWireframe(bool, color, opacity) {
-    api.widgets.each(function(w) { w.setWireframe(bool, color, opacity) });
+    api.widgets.each((w) => { w.setWireframe(bool, color, opacity) });
     space.update();
 }
 
@@ -303,19 +303,19 @@ function updateStats(add) {
 }
 
 export const visuals = {
-    set_progress: setProgress,
-    set_wireframe: setWireframe,
-    set_edges: setEdges,
-    unit_scale: unitScale,
-    update_speeds: updateSpeeds,
-    update_slider: updateSlider,
-    update_slider_max: updateSliderMax,
-    update_stack_labels: updateStackLabelState,
-    update_stats: updateStats,
-    show_slices: showSlices,
     hide_slices: hideSlices,
-    show_slider: showSlider,
     hide_slider: hideSlider,
+    set_edges: setEdges,
+    set_progress: setProgress,
     set_visible_layer: setVisibleLayer,
-    set_widget_visibility: setWidgetVisibility
+    set_widget_visibility: setWidgetVisibility,
+    set_wireframe: setWireframe,
+    show_slices: showSlices,
+    show_slider: showSlider,
+    unit_scale: unitScale,
+    update_slider_max: updateSliderMax,
+    update_slider: updateSlider,
+    update_speeds: updateSpeeds,
+    update_stack_labels: updateStackLabelState,
+    update_stats: updateStats
 };
diff --git a/src/kiri/core/widget.js b/src/kiri/core/widget.js
index a1035977..20874102 100644
--- a/src/kiri/core/widget.js
+++ b/src/kiri/core/widget.js
@@ -703,7 +703,18 @@ class Widget {
         let minZabove = Math.min(Infinity, ...zover);
         let shadow = this.#computeShadowAt(z - 0.005, minZabove);
         if (minZabove < Infinity) {
-            shadow = POLY.union([...shadow, ...shadows[minZabove]], 0.001, true, { wasm: false });
+            shadow = POLY.union([...shadow, ...shadows[minZabove]], 0, true, { wasm: false });
+            // cull interior sliver voids
+            for (let poly of shadow) {
+                if (poly.inner) {
+                    poly.inner = poly.inner.filter(inr => {
+                        let A = inr.area();
+                        let P = inr.perimeter();
+                        let R = (2 * A / P);
+                        return R > 0.05;
+                    });
+                }
+            }
         }
         return shadows[z] = POLY.setZ(shadow, z);
     }
diff --git a/src/kiri/core/widgets.js b/src/kiri/core/widgets.js
index 39d621ee..94adf087 100644
--- a/src/kiri/core/widgets.js
+++ b/src/kiri/core/widgets.js
@@ -105,9 +105,9 @@ export const widgets = {
     replace,
     opacity(o)    { setOpacity(o); console.trace('opacity() deprecated') },
     annotate,
-    setIndexed,
     setAxisIndex,
     setColor(c,s) { api.widgets.each(widget => widget.setColor(c,undefined,s) )},
+    setIndexed,
     setOpacity,
     all()         { return WIDGETS.slice() },
     add(w)        { return WIDGETS.push(w) },