diff --git a/src/components/three/ModelViewer.tsx b/src/components/three/ModelViewer.tsx
index 2e4bde1..a46f032 100644
--- a/src/components/three/ModelViewer.tsx
+++ b/src/components/three/ModelViewer.tsx
@@ -260,19 +260,26 @@ function SceneModels() {
   );
 }
 
-/** Sphere marker at a 3D point — scaled per-frame to keep constant screen size */
+/** Sphere marker at a 3D point — scaled per-frame to keep constant screen size.
+ *  Compensates for any cumulative parent world scale so it stays the same screen
+ *  size whether mounted in world space or inside a transformed model group. */
 function PointMarker({ position, color = '#e8a838' }: { position: [number, number, number]; color?: string }) {
   const ref = useRef<THREE.Mesh>(null);
   const { camera, size } = useThree();
+  const tmpVec = useMemo(() => new THREE.Vector3(), []);
+  const worldPos = useMemo(() => new THREE.Vector3(), []);
   useFrame(() => {
     if (!ref.current) return;
-    const dist = camera.position.distanceTo(ref.current.position);
+    ref.current.getWorldPosition(worldPos);
+    const dist = camera.position.distanceTo(worldPos);
     const perspCam = camera as THREE.PerspectiveCamera;
     const fov = (perspCam.fov ?? 50) * (Math.PI / 180);
     const worldPerPixel = (2 * dist * Math.tan(fov / 2)) / size.height;
-    // Target: ~6 px radius (radius = 1 in base geometry → scale = 6*wpp)
-    const s = Math.max(0.0005, 6 * worldPerPixel);
-    ref.current.scale.setScalar(s);
+    // Target: ~6 px radius (radius = 1 in base geometry → scale = 6*wpp).
+    const targetWorld = Math.max(0.0005, 6 * worldPerPixel);
+    // Divide by parent world scale so the final world size matches `targetWorld`.
+    const parentScale = ref.current.parent ? ref.current.parent.getWorldScale(tmpVec).x || 1 : 1;
+    ref.current.scale.setScalar(targetWorld / parentScale);
   });
   return (
     <mesh ref={ref} position={position}>