fix4

frontend/src/components/viewer/Scene.tsx

@@ -24,6 +24,29 @@ function useClippingPlanes(): THREE.Plane[] {
   }, [enabled, axis, position]);
 }
 
+function isFiniteVec3(v: THREE.Vector3): boolean {
+  return Number.isFinite(v.x) && Number.isFinite(v.y) && Number.isFinite(v.z);
+}
+
+// Une o bounding box só das malhas VISÍVEIS e com geometria válida —
+// alguns objetos do dataset real (anotações/curvas do Z-Anatomy) podem ter
+// vértices degenerados/NaN, e Box3.setFromObject(scene) ingenuamente
+// incluiria isso, distorcendo o enquadramento (ou escondendo tudo o mais
+// fora do "zoom" resultante).
+function computeVisibleBoundingBox(root: THREE.Object3D): THREE.Box3 {
+  const union = new THREE.Box3();
+  const tmp = new THREE.Box3();
+  root.traverse((obj) => {
+    const mesh = obj as THREE.Mesh;
+    if (!mesh.isMesh || !mesh.visible) return;
+    tmp.setFromObject(mesh);
+    if (tmp.isEmpty()) return;
+    if (!isFiniteVec3(tmp.min) || !isFiniteVec3(tmp.max)) return;
+    union.union(tmp);
+  });
+  return union;
+}
+
 function CameraController({ modelFiles }: { modelFiles: string[] }) {
   const controlsRef = useRef<CameraControls>(null);
   const { scene, camera } = useThree();
@@ -37,7 +60,7 @@ function CameraController({ modelFiles }: { modelFiles: string[] }) {
   useEffect(() => {
     if (!controlsRef.current || modelFiles.length === 0) return;
     const id = requestAnimationFrame(() => {
-      const box = new THREE.Box3().setFromObject(scene);
+      const box = computeVisibleBoundingBox(scene);
       if (box.isEmpty()) return;
       const size = box.getSize(new THREE.Vector3()).length();
       // Ajusta os planos de corte da câmera ao tamanho real do conteúdo —
@@ -60,7 +83,7 @@ function CameraController({ modelFiles }: { modelFiles: string[] }) {
     if (!focusRequest || !controlsRef.current) return;
     const obj = scene.getObjectByName(focusRequest.slug);
     if (!obj) return;
-    const box = new THREE.Box3().setFromObject(obj);
+    const box = computeVisibleBoundingBox(obj);
     if (box.isEmpty()) return;
     controlsRef.current.fitToBox(box, true, {
       paddingLeft: 0.4,