fix: respect scene depth for site and ceiling handles

packages/editor/src/components/systems/ceiling/ceiling-selection-affordance-system.tsx

@@ -18,9 +18,9 @@ const BRACKET_THICKNESS = 0.04
 const BRACKET_HEIGHT = 0.04
 const BRACKET_Y_OFFSET = 0.035
 const HIT_BOX_SIZE: [number, number, number] = [0.28, 0.08, 0.28]
-// Draw the corner handles after everything else and with depth testing
-// off (see materials below) so they stay visible — and clickable — even
-// when a wall, roof, or the ceiling itself would otherwise occlude them.
+// Draw the corner handles after the ceiling surface so they read cleanly
+// when unobstructed, while material depth testing still lets other scene
+// geometry hide them.
 const CORNER_RENDER_ORDER = 1000
 
 type CornerBracketData = {
@@ -189,7 +189,7 @@ const CornerBracket = ({
         <boxGeometry args={HIT_BOX_SIZE} />
         <meshBasicMaterial
           color={cubeColor}
-          depthTest={false}
+          depthTest
           depthWrite={false}
           opacity={cubeOpacity}
           transparent
@@ -227,13 +227,7 @@ const BracketLeg = ({
       rotation={[0, angle, 0]}
     >
       <boxGeometry args={[length, BRACKET_HEIGHT, BRACKET_THICKNESS]} />
-      <meshBasicMaterial
-        color={color}
-        depthTest={false}
-        depthWrite={false}
-        opacity={opacity}
-        transparent
-      />
+      <meshBasicMaterial color={color} depthTest depthWrite={false} opacity={opacity} transparent />
     </mesh>
   )
 }

packages/editor/src/components/tools/shared/polygon-editor.tsx

@@ -6,6 +6,7 @@ import {
   BufferGeometry,
   Color,
   CylinderGeometry,
+  DoubleSide,
   ExtrudeGeometry,
   Float32BufferAttribute,
   type Line,
@@ -20,7 +21,6 @@ import {
   ARROW_COLOR as EDGE_ARROW_COLOR,
   ARROW_HOVER_COLOR as EDGE_ARROW_HOVER_COLOR,
   ARROW_SCALE as EDGE_ARROW_SCALE,
-  useArrowMaterial,
   useInvisibleHitAreaMaterial,
 } from '../../editor/node-arrow-handles'
 import { snapToHalf } from '../item/placement-math'
@@ -181,7 +181,7 @@ function usePolygonNodeMaterial(color: string, opacity = 1): MeshBasicNodeMateri
     () =>
       new MeshBasicNodeMaterial({
         color: new Color('#ffffff'),
-        depthTest: false,
+        depthTest: true,
         depthWrite: true,
         opacity: 1,
         transparent: true,
@@ -198,11 +198,24 @@ function usePolygonNodeMaterial(color: string, opacity = 1): MeshBasicNodeMateri
   return material
 }
 
+function usePolygonArrowMaterial(): MeshBasicNodeMaterial {
+  return useMemo(
+    () =>
+      new MeshBasicNodeMaterial({
+        color: new Color(EDGE_ARROW_COLOR),
+        depthTest: true,
+        depthWrite: true,
+        opacity: 1,
+        side: DoubleSide,
+        transparent: true,
+      }),
+    [],
+  )
+}
+
 // One mesh per handle: lives on SCENE_LAYER with a node material so the
-// post-processing ink-edge pass outlines it, and carries the pointer handlers
-// directly so it stays grabbable — matching the registry arrow gizmos in
-// node-arrow-handles.tsx. No paired hit mesh is needed; the R3F event
-// raycaster picks SCENE_LAYER meshes too.
+// post-processing ink-edge pass outlines it. The visual material still
+// depth-tests, so walls/items in front can occlude it.
 function OutlinedCylinderHandle({
   radius,
   height,
@@ -290,7 +303,7 @@ function OutlinedEdgeArrowHandle({
   rotationY: number
   scale: number
 } & PolygonHandleHandlers) {
-  const material = useArrowMaterial()
+  const material = usePolygonArrowMaterial()
   useEffect(() => {
     material.color.set(color)
   }, [color, material])
@@ -741,9 +754,9 @@ export const PolygonEditor: React.FC<PolygonEditorProps> = ({
   const handleHeight = Math.max(MIN_HANDLE_HEIGHT, surfaceHeight + 0.02)
   const edgeHandleY = editY + handleHeight - EDGE_HANDLE_HEIGHT / 2
 
-  // Interactive handles are single SCENE_LAYER node-material meshes (like the
-  // registry arrow gizmos) so the ink-edge pass outlines them while they stay
-  // grabbable. The edge BAR and border line stay on EDITOR_LAYER, visual-only
+  // Interactive handles are SCENE_LAYER node-material meshes so the ink-edge
+  // pass outlines them while normal scene depth can hide them. The edge BAR and
+  // border line stay on EDITOR_LAYER, visual-only
   // (raycast disabled) so they never steal clicks from the vertex/midpoint
   // handles overlapping them — edge dragging starts from the chevron arrow
   // outside the polygon edge.

packages/editor/src/components/tools/site/site-boundary-editor.tsx

@@ -38,6 +38,7 @@ const SITE_FLAG_HALO_COLOR = '#6366f1'
 
 type TintableMaterial = {
   color?: Color
+  depthTest: boolean
   depthWrite: boolean
   opacity: number
   needsUpdate: boolean
@@ -69,10 +70,9 @@ function SiteFlagModel({
         mesh.frustumCulled = false
         mesh.raycast = NO_RAYCAST
         mesh.receiveShadow = false
-        mesh.renderOrder = 1010
         mesh.material = new MeshBasicNodeMaterial({
           color: new Color(ARROW_COLOR),
-          depthTest: false,
+          depthTest: true,
           depthWrite: opacity >= 0.999,
           opacity,
           transparent: opacity < 0.999,
@@ -93,6 +93,7 @@ function SiteFlagModel({
 
         for (const material of materials as Array<MeshBasicNodeMaterial & TintableMaterial>) {
           material.color?.copy(color)
+          material.depthTest = true
           material.opacity = opacity
           material.transparent = opacity < 0.999
           material.depthWrite = opacity >= 0.999
@@ -217,11 +218,23 @@ function SiteFlagFallback({
     <group position={[0, SITE_FLAG_BASE_Y + (active ? SITE_FLAG_ACTIVE_LIFT : 0), 0]}>
       <mesh layers={SCENE_LAYER} position={[0, 0.16, 0]} raycast={NO_RAYCAST}>
         <cylinderGeometry args={[0.11, 0.16, 0.32, 24]} />
-        <meshBasicMaterial color={color} depthTest={false} opacity={opacity} transparent />
+        <meshBasicMaterial
+          color={color}
+          depthTest
+          depthWrite={opacity >= 0.999}
+          opacity={opacity}
+          transparent={opacity < 0.999}
+        />
       </mesh>
       <mesh layers={SCENE_LAYER} position={[0, 0.34, 0]} raycast={NO_RAYCAST}>
         <cylinderGeometry args={[0.04, 0.11, 0.14, 24]} />
-        <meshBasicMaterial color={color} depthTest={false} opacity={opacity} transparent />
+        <meshBasicMaterial
+          color={color}
+          depthTest
+          depthWrite={opacity >= 0.999}
+          opacity={opacity}
+          transparent={opacity < 0.999}
+        />
       </mesh>
     </group>
   )