diff --git a/src/components/XRHud.tsx b/src/components/XRHud.tsx
index 386072c..9d2c3fb 100644
--- a/src/components/XRHud.tsx
+++ b/src/components/XRHud.tsx
@@ -310,6 +310,19 @@ export function XRHud({ freeMove, onToggleFreeMove, placementMode = false, onTog
                 </Button>
               )}
 
+              {/* Allow scale (two-hand zoom) toggle */}
+              {onToggleAllowScale && (
+                <Button
+                  variant={allowScale ? 'default' : 'outline'}
+                  size="sm" className="h-8 gap-1.5 text-[10px] font-mono"
+                  onClick={onToggleAllowScale}
+                  title="Zoom por grip duplo (afastar/aproximar as mãos)"
+                >
+                  <RefreshCw className="h-3.5 w-3.5" />
+                  {allowScale ? 'Zoom ON' : 'Zoom'}
+                </Button>
+              )}
+
               {/* Scale presets */}
               <ScaleSelector variant="compact" />
 
diff --git a/src/components/three/XRControllerMeasure.tsx b/src/components/three/XRControllerMeasure.tsx
index 63b9af9..d5149e8 100644
--- a/src/components/three/XRControllerMeasure.tsx
+++ b/src/components/three/XRControllerMeasure.tsx
@@ -149,18 +149,20 @@ export function XRControllerMeasure() {
           snappedPoint = bestHoleCenter;
           snapKind = 'hole';
         } else if (snapEnabled) {
-          // Try detecting a circular edge (hole) at hit
-          const circle = detectCircularEdgeAtPoint(hit.object, hit.point, fakeCam, canvasSize, 60);
+          // Try detecting a circular edge (hole) at hit — radius mais generoso
+          const circle = detectCircularEdgeAtPoint(hit.object, hit.point, fakeCam, canvasSize, 90);
           if (circle) {
             snappedPoint = circle.center;
             snapKind = 'hole';
             hoverDetected = { kind: 'hole', value: circle.diameterMM, position: circle.center };
           } else {
-            const snap = resolveSnap(hit.object, hit.point, fakeCam, canvasSize, 14, 18);
+            // Snap mais "magnético": raios maiores de busca em pixels
+            //  vértice: 32px (antes 14), aresta: 48px (antes 18)
+            const snap = resolveSnap(hit.object, hit.point, fakeCam, canvasSize, 32, 48);
             snappedPoint = snap.point;
             snapKind = snap.type;
             if (snap.type === 'edge') {
-              const seg = findNearestEdgeSegment(hit.object, hit.point, fakeCam, canvasSize, 18);
+              const seg = findNearestEdgeSegment(hit.object, hit.point, fakeCam, canvasSize, 48);
               if (seg) {
                 const lenMM = seg.a.distanceTo(seg.b) * 1000;
                 hoverDetected = { kind: 'edge', value: lenMM, position: seg.midpoint, endpoints: { a: seg.a, b: seg.b } };
@@ -172,7 +174,9 @@ export function XRControllerMeasure() {
           snapKind = 'surface';
         }
       }
-      // Cache for non-heavy frames so the laser + trigger still have a target
+      // Cache for non-heavy frames so the laser + trigger still have a target.
+      // Sticky: se conseguimos um snap "forte" (vertex/edge/hole), preservamos
+      // ele entre frames leves para evitar cintilação.
       cachedSnappedPoint.current = snappedPoint ? snappedPoint.clone() : null;
       cachedSnapKind.current = snapKind;
     } else {
@@ -227,9 +231,13 @@ export function XRControllerMeasure() {
       if (snappedPoint) {
         tipRef.current.visible = true;
         tipRef.current.position.copy(snappedPoint);
-        // Scale tip with distance from controller (~12mm at 1m)
+        // Tip scales with distance from controller. Snap "forte" (vértice,
+        // aresta, furo) recebe um marcador ~3× maior do que uma superfície
+        // genérica, para que o ponto destacado fique bem visível.
         const dist = tmpOrigin.current.distanceTo(snappedPoint);
-        const s = Math.max(0.004, dist * 0.012);
+        const strongSnap = snapKind === 'vertex' || snapKind === 'edge' || snapKind === 'hole';
+        const factor = strongSnap ? 0.030 : 0.012;
+        const s = Math.max(strongSnap ? 0.010 : 0.004, dist * factor);
         tipRef.current.scale.setScalar(s);
       }
     }
diff --git a/src/components/three/XRGrabbable.tsx b/src/components/three/XRGrabbable.tsx
index 0cb8774..69acba7 100644
--- a/src/components/three/XRGrabbable.tsx
+++ b/src/components/three/XRGrabbable.tsx
@@ -6,8 +6,8 @@ import { useModelStore } from '@/stores/useModelStore';
 
 interface XRGrabbableProps {
   /**
-   * @deprecated Mantido por compatibilidade — agora o zoom por duas mãos
-   * está SEMPRE ativo (faz parte do mapeamento padrão do grip).
+   * Quando true (padrão), o grip duplo aplica ZOOM uniforme além da rotação.
+   * Quando false, o grip duplo só ORBITA — a escala da peça é preservada.
    */
   allowScale?: boolean;
   /** When true, the active model is locked — grab is ignored entirely */
@@ -51,7 +51,7 @@ const _tmpQuat = new THREE.Quaternion();
  *
  * Trigger não interfere aqui (reservado para seleção/medição).
  */
-export function XRGrabbable({ lockedActive = false, onGrabStart, children }: XRGrabbableProps) {
+export function XRGrabbable({ allowScale = true, lockedActive = false, onGrabStart, children }: XRGrabbableProps) {
   const groupRef = useRef<THREE.Group>(null);
   const grab = useControllerGrab();
 
@@ -121,8 +121,10 @@ export function XRGrabbable({ lockedActive = false, onGrabStart, children }: XRG
 
       const d = dual.current;
       const deltaQuat = new THREE.Quaternion().setFromUnitVectors(d.startAxis, axisNow);
-      // ZOOM sempre ativo no grip duplo
-      const scaleRatio = THREE.MathUtils.clamp(distNow / d.startDist, 0.1, 10);
+      // ZOOM só quando allowScale=true. Caso contrário, mantém escala 1× (só orbita).
+      const scaleRatio = allowScale
+        ? THREE.MathUtils.clamp(distNow / d.startDist, 0.1, 10)
+        : 1;
 
       const tToOrigin = new THREE.Matrix4().makeTranslation(-d.startMid.x, -d.startMid.y, -d.startMid.z);
       const tBack = new THREE.Matrix4().makeTranslation(midNow.x, midNow.y, midNow.z);
diff --git a/src/components/three/XRHudInWorld.tsx b/src/components/three/XRHudInWorld.tsx
index 4f89c49..dd41d6e 100644
--- a/src/components/three/XRHudInWorld.tsx
+++ b/src/components/three/XRHudInWorld.tsx
@@ -328,6 +328,15 @@ function ToolsTab(p: XRHudInWorldProps) {
   const setShowGrid = useModelStore((s) => s.setShowGrid);
   const measureMode = useModelStore((s) => s.measureMode);
   const setMeasureMode = useModelStore((s) => s.setMeasureMode);
+  const selectionMode = useModelStore((s) => s.selectionMode);
+  const setSelectionMode = useModelStore((s) => s.setSelectionMode);
+  const selectedCount = useModelStore((s) => s.selectedElementKeys.size);
+  const hideSelectedElements = useModelStore((s) => s.hideSelectedElements);
+  const isolateSelectedElements = useModelStore((s) => s.isolateSelectedElements);
+  const showAllElements = useModelStore((s) => s.showAllElements);
+  const hasHidden = useModelStore((s) =>
+    s.hiddenElementKeys.size > 0 || s.isolatedElementKeys !== null
+  );
   const scaleRatio = useModelStore((s) => s.scaleRatio);
   const setScaleRatio = useModelStore((s) => s.setScaleRatio);
   const resetScale = useModelStore((s) => s.resetScale);
@@ -353,52 +362,61 @@ function ToolsTab(p: XRHudInWorldProps) {
       <XR3DButton position={[0.08, 0.025, 0]} size={[0.075, 0.022]}
         label={p.placementMode ? 'Posic…' : 'Reposic.'}
         active={p.placementMode} onClick={p.onTogglePlacement} />
+      <XR3DButton position={[0.16, 0.025, 0]} size={[0.075, 0.022]}
+        label={`Zoom ${p.allowScale ? 'ON' : 'OFF'}`}
+        active={p.allowScale} onClick={p.onToggleAllowScale} />
 
-      <Text position={[-0.24, -0.02, 0]} fontSize={0.008} color="#94a3b8" anchorX="left">
+      {/* Selecionar — paridade com a tela inicial */}
+      <Text position={[-0.24, -0.005, 0]} fontSize={0.008} color="#94a3b8" anchorX="left">Selecionar</Text>
+      <XR3DButton position={[-0.16, -0.03, 0]} size={[0.075, 0.022]}
+        label={selectionMode ? (selectedCount > 0 ? `${selectedCount} sel.` : 'Selec…') : 'Selec'}
+        active={selectionMode} onClick={() => setSelectionMode(!selectionMode)} />
+      <XR3DButton position={[-0.08, -0.03, 0]} size={[0.075, 0.022]} label="Esconder"
+        onClick={hideSelectedElements} />
+      <XR3DButton position={[0.0, -0.03, 0]} size={[0.075, 0.022]} label="Isolar"
+        onClick={isolateSelectedElements} />
+      <XR3DButton position={[0.08, -0.03, 0]} size={[0.075, 0.022]} label="Mostrar"
+        active={hasHidden} onClick={showAllElements} />
+
+      <Text position={[-0.24, -0.06, 0]} fontSize={0.008} color="#94a3b8" anchorX="left">
         Opacidade {Math.round(opacity * 100)}%
       </Text>
-      <XR3DButton position={[-0.16, -0.045, 0]} size={[0.05, 0.022]} label="−25%"
+      <XR3DButton position={[-0.16, -0.085, 0]} size={[0.05, 0.022]} label="−25%"
         onClick={() => setOpacity(Math.max(0, opacity - 0.25))} />
-      <XR3DButton position={[-0.105, -0.045, 0]} size={[0.05, 0.022]} label="−5%"
+      <XR3DButton position={[-0.105, -0.085, 0]} size={[0.05, 0.022]} label="−5%"
         onClick={() => setOpacity(Math.max(0, opacity - 0.05))} />
-      <XR3DButton position={[-0.05, -0.045, 0]} size={[0.05, 0.022]} label="+5%"
+      <XR3DButton position={[-0.05, -0.085, 0]} size={[0.05, 0.022]} label="+5%"
         onClick={() => setOpacity(Math.min(1, opacity + 0.05))} />
-      <XR3DButton position={[0.005, -0.045, 0]} size={[0.05, 0.022]} label="+25%"
+      <XR3DButton position={[0.005, -0.085, 0]} size={[0.05, 0.022]} label="+25%"
         onClick={() => setOpacity(Math.min(1, opacity + 0.25))} />
-      <XR3DButton position={[0.06, -0.045, 0]} size={[0.05, 0.022]} label="100%"
+      <XR3DButton position={[0.06, -0.085, 0]} size={[0.05, 0.022]} label="100%"
         onClick={() => setOpacity(1)} />
 
-      <Text position={[-0.24, -0.085, 0]} fontSize={0.008} color="#94a3b8" anchorX="left">
+      <Text position={[-0.24, -0.115, 0]} fontSize={0.008} color="#94a3b8" anchorX="left">
         Escala {scaleRatio.label}
       </Text>
       {SCALE_LABELS.map((lbl, i) => {
         const preset = SCALE_PRESETS.find((sp) => sp.label === lbl)!;
         return (
           <XR3DButton key={lbl}
-            position={[-0.16 + i * 0.06, -0.11, 0]} size={[0.055, 0.022]} label={lbl}
+            position={[-0.16 + i * 0.06, -0.14, 0]} size={[0.055, 0.022]} label={lbl}
             active={scaleRatio.label === lbl}
             onClick={() => setScaleRatio(preset)} />
         );
       })}
-      {/* Reset Escala — devolve a peça ao tamanho 1:1 (cancela qualquer
-          escala manual feita com duas mãos). */}
-      <XR3DButton position={[0.10, -0.11, 0]} size={[0.062, 0.022]}
+      <XR3DButton position={[0.10, -0.14, 0]} size={[0.062, 0.022]}
         label="↺ Reset" color="#dc2626"
         onClick={resetScale} fontSize={0.0085} />
-      {/* Limpa todos os labels de medição. */}
-      <XR3DButton position={[0.17, -0.11, 0]} size={[0.062, 0.022]}
+      <XR3DButton position={[0.17, -0.14, 0]} size={[0.062, 0.022]}
         label="✕ Medidas" color="#dc2626"
         onClick={clearMeasurements} fontSize={0.0085} />
 
-      {/* Legenda dos controles para Medir */}
       {measureMode && (
-        <Text position={[-0.24, -0.145, 0]} fontSize={0.0065} color="#a3e635" anchorX="left" maxWidth={0.5}>
+        <Text position={[-0.24, -0.17, 0]} fontSize={0.0065} color="#a3e635" anchorX="left" maxWidth={0.5}>
           Gatilho D: marcar · A: desfazer · B: limpar · Gatilho E: alternar snap
         </Text>
       )}
 
-
-      {/* Grid floor controls */}
       <GridFloorRow />
     </group>
   );
diff --git a/src/pages/XRSession.tsx b/src/pages/XRSession.tsx
index 9164e34..8bb52ae 100644
--- a/src/pages/XRSession.tsx
+++ b/src/pages/XRSession.tsx
@@ -471,9 +471,8 @@ const XRSession = () => {
   const [freeMove, setFreeMove] = useState(true);
   const [placementMode, setPlacementMode] = useState(true); // start in placement mode
   const [snapToPlanes, setSnapToPlanes] = useState(true);
-  // Zoom por grip duplo é SEMPRE ligado (parte do mapeamento padrão).
-  const allowScale = true;
-  const setAllowScale = (_v?: boolean) => {};
+  // Zoom por grip duplo — toggle real, padrão ligado.
+  const [allowScale, setAllowScale] = useState(true);
   const [liveCode, setLiveCode] = useState<string | null>(null);
   const [liveViewers, setLiveViewers] = useState(0);
   // Rig que envolve <XROrigin/> — locomoção por joystick escreve aqui.