diff --git a/src/components/three/XRHudInWorld.tsx b/src/components/three/XRHudInWorld.tsx
index ce1921b..5c6bf98 100644
--- a/src/components/three/XRHudInWorld.tsx
+++ b/src/components/three/XRHudInWorld.tsx
@@ -309,6 +309,40 @@ function ToolsTab(p: XRHudInWorldProps) {
             onClick={() => setScaleRatio(preset)} />
         );
       })}
+
+      {/* Grid floor controls */}
+      <GridFloorRow />
+    </group>
+  );
+}
+
+function GridFloorRow() {
+  const { camera } = useThree();
+  const gridY = useModelStore((s) => s.gridY);
+  const gridAutoFollow = useModelStore((s) => s.gridAutoFollow);
+  const setGridAutoFollow = useModelStore((s) => s.setGridAutoFollow);
+  const setGridY = useModelStore((s) => s.setGridY);
+  const nudgeGridY = useModelStore((s) => s.nudgeGridY);
+  const placeAtFloor = () => {
+    // Headset eye Y minus avg standing eye height (1.6 m)
+    const floor = camera.position.y - 1.6;
+    setGridY(floor);
+  };
+  return (
+    <group>
+      <Text position={[-0.24, -0.15, 0]} fontSize={0.008} color="#94a3b8" anchorX="left">
+        Grid Y {(gridY * 1000).toFixed(0)}mm {gridAutoFollow ? '(auto)' : '(travado)'}
+      </Text>
+      <XR3DButton position={[-0.16, -0.175, 0]} size={[0.055, 0.022]} label="Auto"
+        active={gridAutoFollow} onClick={() => setGridAutoFollow(true)} />
+      <XR3DButton position={[-0.10, -0.175, 0]} size={[0.055, 0.022]} label="Travar"
+        active={!gridAutoFollow} onClick={() => setGridAutoFollow(false)} />
+      <XR3DButton position={[-0.04, -0.175, 0]} size={[0.04, 0.022]} label="−1cm"
+        onClick={() => nudgeGridY(-0.01)} />
+      <XR3DButton position={[0.005, -0.175, 0]} size={[0.04, 0.022]} label="+1cm"
+        onClick={() => nudgeGridY(0.01)} />
+      <XR3DButton position={[0.07, -0.175, 0]} size={[0.075, 0.022]} label="Pousar chão"
+        onClick={placeAtFloor} />
     </group>
   );
 }