diff --git a/src/components/three/XRControllerMeasure.tsx b/src/components/three/XRControllerMeasure.tsx
index 668bb68..be27487 100644
--- a/src/components/three/XRControllerMeasure.tsx
+++ b/src/components/three/XRControllerMeasure.tsx
@@ -44,6 +44,11 @@ export function XRControllerMeasure() {
   const laserMat = useRef(new THREE.LineBasicMaterial({ color: '#22c55e', transparent: true, opacity: 0.7, depthTest: false }));
   const tipColor = useRef(new THREE.Color('#22c55e'));
 
+  // Dwell detection for hover-based smart measurement (1 s)
+  const dwellPos = useRef(new THREE.Vector3(Infinity, Infinity, Infinity));
+  const dwellStart = useRef(0);
+  const dwellFired = useRef(false);
+
   useFrame((_state, _dt, frame: XRFrame | undefined) => {
     const measureMode = useModelStore.getState().measureMode;
     if (laserRef.current) laserRef.current.visible = false;