diff --git a/LEARNINGS.md b/LEARNINGS.md
index 5942a9f..d8bc64e 100644
--- a/LEARNINGS.md
+++ b/LEARNINGS.md
@@ -7,6 +7,31 @@
 
 ## Learnings
 
+### 2026-03-07 | Security | Media-Endpoints ohne Auth — Tenant-RLS reicht nicht allein
+**Problem**: `list_assets`, `download_asset`, `zip_download` hatten kein `get_current_user`-Dep → unauthentifizierte Requests möglich. RLS schützt nur Datenbankzugriffe, nicht HTTP-Ebene.
+**Lösung**: `_user: User = Depends(get_current_user)` zu allen drei Endpoints hinzufügen. RLS filtert dann automatisch per Tenant-ID aus dem JWT-Token (via Session-Variable `app.current_tenant_id`).
+**Für künftige Projekte**: Jeder neue Router-Endpoint braucht expliziten Auth-Dep — RLS ist Defense-in-Depth, kein Ersatz für HTTP-Auth.
+
+### 2026-03-07 | MediaAsset | `is_animation` Flag entscheidet Asset-Type — falsches Design
+**Problem**: `import_existing_media_assets` + `render_order_line_task` nutzten `output_type.is_animation == True` um `asset_type = turntable` zu setzen — auch für `.jpg` Poster-Frames aus Animations-OutputTypes. Folge: 6 JPG-Assets als `turntable` in DB → Broken-Video-Icons in MediaBrowser.
+**Lösung**: Extension entscheidet: `.mp4`/`.webm` → `turntable`, alles andere → `still`. `is_animation` Flag ist für OutputType-Konfiguration, nicht für Asset-Klassifizierung.
+**Für künftige Projekte**: MIME-Typ/Extension immer als primäre Typ-Quelle, niemals Meta-Flags des Auftrags.
+
+### 2026-03-07 | OCC | Bounding-Box aus STEP mit `Bnd_Box` + `brepbndlib.Add()`
+**Problem**: Keine Real-World-Dimensions in der DB — weder Breite/Höhe/Tiefe noch Bauteil-Mittelpunkt. OCC-Extraktion lieferte nur Kanten-Topologie.
+**Lösung**: `from OCC.Core.Bnd import Bnd_Box; from OCC.Core.BRepBndLib import brepbndlib; bbox = Bnd_Box(); brepbndlib.Add(shape, bbox); xmin,ymin,zmin,xmax,ymax,zmax = bbox.Get()` → `dimensions_mm = {x, y, z}` in `mesh_attributes` JSONB. Kein neues DB-Feld nötig — JSONB-Erweiterung reicht.
+**Für künftige Projekte**: OCC `Bnd_Box` gibt Werte in mm (STEP-Einheit). In Blender nach Scale-Apply (0.001) sind die Werte dann in m.
+
+### 2026-03-07 | Storage | `storage_key` absolute Pfade brachen Volume-Moves
+**Problem**: `step_tasks.py` und `admin.py` schrieben `storage_key=str(output_path)` mit absoluten Pfaden (`/shared/data/uploads/...`). Nach Volume-Umzug in v2 waren 398 Assets nicht mehr erreichbar.
+**Lösung**: `_normalize_key()` Helper: strippt `UPLOAD_DIR`-Prefix. In `download_asset` Legacy-Remapping für alte Pfade als Fallback behalten. Neue Assets immer relativ speichern.
+**Für künftige Projekte**: `storage_key` immer relativ zu `UPLOAD_DIR` → `candidate = Path(settings.upload_dir) / key`. Absolute Pfade nie in die DB schreiben.
+
+### 2026-03-07 | Workflow | Turntable-Workflow brauchte step_path zur Laufzeit
+**Problem**: `WorkflowDefinition.config` ist statisch (JSON) — enthält keine produktspezifischen Pfade. `_build_turntable()` erwartet `step_path` + `output_dir` in params → `ValueError` bei Workflow-Dispatch.
+**Lösung**: `dispatch_render_with_workflow()` löst `step_path` + `output_dir` aus dem `OrderLine → Product → CadFile` Graph auf und injiziert sie in params vor `dispatch_workflow()`.
+**Für künftige Projekte**: Workflow-Configs müssen zwischen statischen Parametern (engine, samples) und laufzeit-abhängigen (Dateipfade, IDs) unterscheiden. Letztere immer im Dispatch-Service auflösen.
+
 ### 2026-03-06 | Docker | `COPY --from=docker-cli cli-plugins` schlägt fehl wenn Pfad nicht existiert
 **Problem**: `docker:cli` Image hat `/usr/local/bin/docker` aber KEIN `/usr/local/lib/docker/cli-plugins` Verzeichnis — `COPY --from` bricht ab.
 **Lösung**: Nur `/usr/local/bin/docker` kopieren. Compose-Plugin wird über `docker compose` (space, nicht `-`) aufgerufen — das Binary enthält compose bereits bei neueren docker:cli Images.
@@ -347,3 +372,100 @@ SQLAlchemy `Enum(create_type=False)` funktioniert nicht zuverlässig mit asyncpg
 **Problem:** `vitest`- und `msw`-Imports in `src/__tests__/` erzeugen TypeScript-Fehler in `tsc --noEmit` weil diese Packages ihre Typen nur im Test-Kontext (über vitest globals) bereitstellen. `tsc` kennt die Types nicht, obwohl die Packages installiert sind.
 **Lösung:** In `tsconfig.json` ein `"exclude": ["src/__tests__"]` hinzufügen. Vitest führt seine eigene Typ-Prüfung durch; der Haupt-Build braucht nur Produktionscode zu prüfen.
 **Für künftige Projekte:** Test-Verzeichnisse immer aus der Haupt-tsconfig ausschließen und eine separate `tsconfig.test.json` oder Vitest-interne Typ-Prüfung nutzen.
+
+---
+
+### 2026-03-07 | PostgreSQL RLS | SET LOCAL muss in jeder Transaktion erneut gesetzt werden
+**Problem:** `GRANT BYPASSRLS TO schaeffler` in Migration 036 schlug still fehl (schaeffler ist kein Superuser). Alle Endpoints die `cad_files`, `order_lines`, `products` abfragen (z.B. `import_existing_media_assets`, `get_thumbnail`, `_resolve_thumbnails_bulk`) erhielten durch RLS 0 Zeilen zurück → Media-Browser leer, Thumbnails fehlten.
+**Lösung:** `await db.execute(text("SET LOCAL app.current_tenant_id = 'bypass'"))` direkt vor jede RLS-geschützte Query in internen/admin Endpoints setzen. `SET LOCAL` wirkt nur für die aktuelle Transaktion — reicht für async SQLAlchemy (gleiche Session = gleiche Transaktion).
+**Regel:** Jeder interne Endpoint der ohne User-Auth-Kontext RLS-Tabellen liest braucht expliziten `SET LOCAL`-Bypass. BYPASSRLS-Grant an App-User ist kein sicherer Weg.
+
+---
+
+### 2026-03-07 | trimesh | GLB-Export-Scale: STL in mm → Three.js in Metern
+**Problem:** STL-Cache enthält Vertices in Millimetern (STEP-Standard). trimesh exportiert ohne Skalierung → Three.js liest GLB in Metern → Objekte 1000× zu groß.
+**Lösung:** `mesh.apply_scale(scale_factor)` (default 0.001) nach `trimesh.load()` vor Export. Bei `trimesh.Scene` über `scene.geometry.values()` iterieren; bei einzelnem `Trimesh` direkt anwenden.
+**Auch:** `trimesh.smoothing.filter_laplacian(mesh, lamb=0.5, iterations=5)` für smooth normals (STL speichert nur Facet-Normals → facettiertes Aussehen ohne Smoothing).
+
+---
+
+### 2026-03-07 | React Dashboard | Responsive CSS-Grid mit matchMedia
+**Problem:** CSS Grid mit `gridColumnStart/End/RowStart/End` per Inline-Style lässt sich nicht mit Tailwind-Breakpoints kombinieren — Inline-Styles haben keine Medienabfrage-Unterstützung.
+**Lösung:** Custom Hook `useLargeScreen()` mit `window.matchMedia('(min-width: 1024px)')` + Change-Listener. `isLarge`-Boolean bedingt die Inline-Styles: Auf großen Screens: Grid-Positioning aktiv; auf kleinen Screens: leeres Style-Objekt → natürlicher Flow (Widgets stacken).
+**Regel:** Wenn CSS-Grid-Positioning über Inline-Styles kommt (z.B. aus DB-Konfiguration), immer matchMedia-Hook zur responsiven Steuerung verwenden statt CSS-only.
+
+---
+
+### 2026-03-07 | Media Browser | ZIP-Download 22-Byte-Korruption
+**Problem:** ZIP-Download-Endpoint lieferte 22-Byte-leere Archive. Ursache: `storage_key` enthielt absolute Pfade (z.B. `/shared/renders/...`). `except Exception: pass` im Generator schluckte den Fehler still.
+**Lösung:** Pfad-Check vor MinIO-Fallback: `Path(key)` prüfen ob absolut; falls nicht → relativ zu `UPLOAD_DIR`. `candidate.exists()` → `read_bytes()`. `except` loggt jetzt `logger.warning()` statt silent pass.
+**Regel:** In Generator-Funktionen für Streaming-Responses IMMER loggen — silent pass führt zu korrupten Archiven ohne sichtbaren Fehler.
+
+---
+
+### 2026-03-07 | Frontend | Fehlende React-Imports crashen die gesamte App (Blank Page)
+**Problem:** `useEffect` in `useLargeScreen()` Hook hinzugefügt, aber `import { useState } from 'react'` nicht auf `import { useState, useEffect } from 'react'` erweitert. Vite/React wirft zur Laufzeit `ReferenceError: useEffect is not defined` → ErrorBoundary auf Root-Level fängt nicht ab → gesamte React-App zeigt leere Seite.
+**Warum /check es nicht gefangen hat:** `/check` rief `npm test` und `npm run lint` auf — kein `lint`-Script vorhanden, kein TypeScript-Compiler (`tsc`) in `node_modules` lokal (Deps nur in Docker). `npm test` (Vitest) lief für Test-Dateien, prüfte aber keine Production-Komponenten auf fehlende Imports.
+**Lösung:** `useEffect` zum Import hinzugefügt. **Langfristig:** `tsc --noEmit` als Quality Gate im Container ausführen.
+**Regel:** Nach jedem neuen React-Hook oder neuer API (`useEffect`, `useCallback`, `useRef` etc.) sofort prüfen ob der Import oben in der Datei ergänzt wurde.
+
+---
+
+### 2026-03-07 | Storage Keys | Absolute Pfade in DB brechen nach Infrastruktur-Änderung
+**Problem:** Flamenco schrieb Render-Outputs nach `/shared/renders/{uuid}/{file}`. Nach Flamenco-Entfernung wurden die Dateien in `/app/uploads/renders/` kopiert, aber die `storage_key`-Werte in `media_assets` blieben auf `/shared/renders/...`. Der `download_asset`-Endpoint suchte den absoluten Pfad (existiert nicht) und fiel auf MinIO zurück (auch nicht vorhanden) → HTTP 404 für 396 Blender-Renders.
+**Lösung:**
+1. Bulk-UPDATE: `UPDATE media_assets SET storage_key = 'renders/{uuid}/{file}' WHERE storage_key LIKE '/shared/renders/%'` (nur für Dateien die am neuen Pfad existieren)
+2. Safety-Net im Code: Wenn absoluter Pfad nicht existiert und `/shared/renders/` enthält → automatisch auf `UPLOAD_DIR/renders/` remappen
+3. `settings.UPLOAD_DIR` war falsch (Pydantic-Setting heißt `upload_dir` lowercase) — ebenfalls behoben
+**Regelung:** `storage_key` in MediaAssets IMMER relativ zu `UPLOAD_DIR` speichern, nie als absoluten Pfad. Format: `renders/{uuid}/{filename}` oder `thumbnails/{uuid}/{filename}`. Absolute Pfade brechen bei jedem Container-Rebuild oder Volume-Umzug.
+
+---
+
+### 2026-03-07 | Config | Pydantic Settings: Attributname case-sensitive
+**Problem:** `settings.UPLOAD_DIR` warf `AttributeError` — Pydantic-Settings-Objekte sind case-sensitive. Das korrekte Attribut heißt `upload_dir` (lowercase, wie in config.py definiert).
+**Lösung:** Alle Zugriffe auf `settings.UPLOAD_DIR` → `settings.upload_dir` korrigiert.
+**Quality Gate:** `docker compose exec backend python -c "from app.config import settings; print(settings.upload_dir)"` als Smoke-Test für Config-Zugriff.
+
+
+---
+
+### 2026-03-07 | Media ZIP | MIME-Type-basierte Extension → ".bin" statt ".png"
+**Problem:** `zip_download` ermittelte Datei-Extension via `(a.mime_type or "").split("/")[-1] or "bin"`. Für Assets mit `mime_type=None` (importierte Flamenco-Renders) → Extension `"bin"` → Dateien im ZIP als `.bin` statt `.png`/`.jpg` — ZIP öffnet, aber keine Bilder erkennbar.
+**Lösung:** Extension primär aus `Path(storage_key).suffix` lesen — der storage_key enthält immer die echte Datei-Extension. MIME-Type nur als Fallback. Zusätzlich: Original-Dateiname aus `storage_key` statt generischem `{type}_{uuid}.{ext}` verwenden. Duplikat-Filenames (mehrere Assets mit gleichem Dateinamen) werden mit `_1`, `_2` Suffix dedupliziert.
+**Regel:** Datei-Erweiterung IMMER aus dem tatsächlichen Dateinamen (storage_key) lesen, nie nur aus MIME-Type. MIME-Types können null sein oder nicht dem tatsächlichen Format entsprechen.
+
+---
+
+### 2026-03-07 | Frontend | `<img src>` kann keine Auth-Header senden — useAuthBlob Hook nötig
+**Problem:** `<img src="/api/media/{id}/download">` schickt keine `Authorization`-Header → 401 → `imgError=true` → graues Icon in der Media Library. Betrifft alle Browser-nativen Elemente (`<img>`, `<video>`, `<audio>`).
+**Lösung:** `useAuthBlob(url, enabled)` Hook: `fetch(url, { headers: { Authorization: \`Bearer ${token}\` } })` → `URL.createObjectURL(blob)` → Blob-URL als `src` nutzen. Cleanup via `URL.revokeObjectURL` + `cancelled`-Flag gegen Race Conditions.
+**Für künftige Projekte:** Jeder auth-geschützte Media-Endpoint der in `<img>`/`<video>` eingebettet wird, braucht einen Blob-URL-Wrapper. Alternativ: kurzzeitige signed URLs (S3-Presigned) auf Backend-Seite.
+
+### 2026-03-07 | Backend | publish_asset fehlte product_id + cad_file_id → kein Thumbnail-Fallback
+**Problem:** `publish_asset` Celery-Task erstellte `MediaAsset`-Records ohne `product_id`/`cad_file_id` zu setzen. `get_thumbnail_url()` und `_resolve_thumbnails_bulk()` konnten keinen Thumbnail-Fallback für `still`-Assets berechnen → graue Icons für alle neu gerenderten Stills.
+**Lösung:** In `publish_asset` nach dem Laden der `OrderLine` auch `Product` laden und `product_id=line.product_id` + `cad_file_id=product.cad_file_id` auf das neue `MediaAsset` setzen.
+**Regel:** MediaAssets immer mit allen verfügbaren Referenz-FKs erstellen — diese werden für Thumbnail-Resolution und Tenant-Isolation benötigt.
+
+### 2026-03-07 | Frontend | Inline 3D Viewer — GLB mit Auth via Blob URL laden
+**Problem:** `useGLTF(url)` aus `@react-three/drei` kann keine Auth-Header setzen → direkte Asset-Download-URLs nicht nutzbar. `<Canvas>` braucht einen echten URL-String (keine Promise).
+**Lösung:** GLB per `fetch(url, { headers: { Authorization } })` → `.blob()` → `URL.createObjectURL(blob)` → String-URL an `useGLTF(blobUrl)` übergeben. Revoke in `useEffect`-Cleanup. Polling (4s) während GLB-Generierung läuft.
+**Für künftige Projekte:** Three.js / drei kennen kein Auth-Konzept. Alle auth-geschützten 3D-Assets immer als Blob-URL laden.
+
+### 2026-03-07 | Backend | trimesh in optionalem [cad]-Extra — nicht im Docker-Build installiert
+**Problem:** `trimesh` ist in `pyproject.toml` unter `[project.optional-dependencies] cad = [...]` definiert. `Dockerfile` installierte nur `pip install -e ".[dev]"` → `trimesh` fehlte → `export_gltf_colored` warf `ModuleNotFoundError` beim ersten Aufruf.
+**Lösung:** `Dockerfile` auf `pip install -e ".[dev,cad]"` umgestellt + Backend-Container neu gebaut.
+**Regel:** Beim Hinzufügen optionaler Extras zu `pyproject.toml` immer prüfen ob alle relevanten Container-Images das Extra auch installieren. Im Zweifel alle Runtime-Deps in `[project.dependencies]` (nicht optional) packen.
+
+### 2026-03-07 | Frontend | URL.revokeObjectURL sofort nach click() → Race Condition
+**Problem:** `URL.revokeObjectURL(url)` wurde synchron nach `a.click()` aufgerufen. `click()` für Downloads ist in manchen Browsern asynchron — die Object-URL wird freigegeben bevor der Browser-Download starten kann → leere/korrupte Datei.
+**Lösung:** `setTimeout(() => URL.revokeObjectURL(url), 100)` — gibt dem Browser 100ms Zeit den Download zu registrieren, bevor die In-Memory-URL freigegeben wird.
+**Gilt für:** Alle programmatischen Blob-Downloads via `createObjectURL` + `a.click()`.
+
+---
+
+### 2026-03-07 | Media Import | Falsche asset_type-Klassifizierung durch Dateinamen-Matching
+**Problem:** `import_existing_media_assets` klassifizierte Dateien als `turntable` weil der Dateiname "Turntable" enthielt — unabhängig von der tatsächlichen Dateiendung. Poster-Frame-Bilder (`F-802007_Turntable_Video_White.jpg`) wurden als `asset_type=turntable` gespeichert. In der Media Browser UI wurde versucht, diese `.jpg`-Dateien als `<video>` zu rendern → kaputtes Video-Element. ZIP-Download lieferte `.jpg` statt `.mp4`.
+**Lösung:**
+1. **Daten-Fix**: `UPDATE media_assets SET asset_type='still' WHERE asset_type='turntable' AND (storage_key LIKE '%.jpg' OR mime_type LIKE 'image/%')` — 6 Assets reklassifiziert.
+2. **Code-Fix**: `isVideoAsset()` und `isImageAsset()` nutzen jetzt zusätzlich `mime_type` zur Entscheidung. Turntable + `image/jpeg` MIME → als Bild rendern, nicht als Video.
+**Regel:** Asset-Typ-Klassifizierung IMMER aus `mime_type` + Dateiendung ableiten, nie nur aus Dateiname. MIME-Type ist die verlässlichste Quelle.
diff --git a/backend/Dockerfile b/backend/Dockerfile
index 82b1a41..f572e58 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -19,9 +19,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 # Copy docker CLI for worker scaling
 COPY --from=docker-cli /usr/local/bin/docker /usr/local/bin/docker
 
-# Install Python dependencies (including dev extras for pytest)
+# Install Python dependencies (dev + cad extras: pytest, trimesh, pygltflib)
 COPY pyproject.toml .
-RUN pip install --no-cache-dir -e ".[dev]"
+RUN pip install --no-cache-dir -e ".[dev,cad]"
 
 # Copy app code
 COPY . .
diff --git a/backend/app/api/routers/admin.py b/backend/app/api/routers/admin.py
index 9d024fd..f362dac 100644
--- a/backend/app/api/routers/admin.py
+++ b/backend/app/api/routers/admin.py
@@ -41,6 +41,14 @@ SETTINGS_DEFAULTS: dict[str, str] = {
     "smtp_user":                       "",
     "smtp_password":                   "",
     "smtp_from_address":               "",
+    # 3D viewer / glTF export settings
+    "gltf_scale_factor":               "0.001",
+    "gltf_smooth_normals":             "true",
+    "viewer_max_distance":             "50",
+    "viewer_min_distance":             "0.001",
+    "gltf_material_quality":           "pbr_colors",
+    "gltf_pbr_roughness":              "0.4",
+    "gltf_pbr_metallic":               "0.6",
 }
 
 
@@ -63,6 +71,13 @@ class SettingsOut(BaseModel):
     smtp_user: str = ""
     smtp_password: str = ""
     smtp_from_address: str = ""
+    gltf_scale_factor: float = 0.001
+    gltf_smooth_normals: bool = True
+    viewer_max_distance: float = 50.0
+    viewer_min_distance: float = 0.001
+    gltf_material_quality: str = "pbr_colors"
+    gltf_pbr_roughness: float = 0.4
+    gltf_pbr_metallic: float = 0.6
 
 
 class SettingsUpdate(BaseModel):
@@ -84,6 +99,13 @@ class SettingsUpdate(BaseModel):
     smtp_user: str | None = None
     smtp_password: str | None = None
     smtp_from_address: str | None = None
+    gltf_scale_factor: float | None = None
+    gltf_smooth_normals: bool | None = None
+    viewer_max_distance: float | None = None
+    viewer_min_distance: float | None = None
+    gltf_material_quality: str | None = None
+    gltf_pbr_roughness: float | None = None
+    gltf_pbr_metallic: float | None = None
 
 
 @router.get("/users", response_model=list[UserOut])
@@ -191,6 +213,13 @@ def _settings_to_out(raw: dict[str, str]) -> SettingsOut:
         smtp_user=raw.get("smtp_user", ""),
         smtp_password=raw.get("smtp_password", ""),
         smtp_from_address=raw.get("smtp_from_address", ""),
+        gltf_scale_factor=float(raw.get("gltf_scale_factor", "0.001")),
+        gltf_smooth_normals=raw.get("gltf_smooth_normals", "true") == "true",
+        viewer_max_distance=float(raw.get("viewer_max_distance", "50")),
+        viewer_min_distance=float(raw.get("viewer_min_distance", "0.001")),
+        gltf_material_quality=raw.get("gltf_material_quality", "pbr_colors"),
+        gltf_pbr_roughness=float(raw.get("gltf_pbr_roughness", "0.4")),
+        gltf_pbr_metallic=float(raw.get("gltf_pbr_metallic", "0.6")),
     )
 
 
@@ -285,6 +314,20 @@ async def update_settings(
         updates["smtp_password"] = body.smtp_password
     if body.smtp_from_address is not None:
         updates["smtp_from_address"] = body.smtp_from_address
+    if body.gltf_scale_factor is not None:
+        updates["gltf_scale_factor"] = str(body.gltf_scale_factor)
+    if body.gltf_smooth_normals is not None:
+        updates["gltf_smooth_normals"] = "true" if body.gltf_smooth_normals else "false"
+    if body.viewer_max_distance is not None:
+        updates["viewer_max_distance"] = str(body.viewer_max_distance)
+    if body.viewer_min_distance is not None:
+        updates["viewer_min_distance"] = str(body.viewer_min_distance)
+    if body.gltf_material_quality is not None:
+        updates["gltf_material_quality"] = body.gltf_material_quality
+    if body.gltf_pbr_roughness is not None:
+        updates["gltf_pbr_roughness"] = str(body.gltf_pbr_roughness)
+    if body.gltf_pbr_metallic is not None:
+        updates["gltf_pbr_metallic"] = str(body.gltf_pbr_metallic)
 
     for k, v in updates.items():
         await _save_setting(db, k, v)
@@ -368,6 +411,33 @@ async def regenerate_thumbnails(
     return {"queued": queued, "message": f"Re-queued {queued} CAD file(s) for thumbnail regeneration"}
 
 
+@router.post("/settings/reextract-metadata", status_code=status.HTTP_202_ACCEPTED)
+async def reextract_all_metadata(
+    admin: User = Depends(require_admin),
+    db: AsyncSession = Depends(get_db),
+):
+    """Re-extract OCC metadata (dimensions, sharp edges) for all completed CAD files.
+
+    Updates mesh_attributes without re-rendering thumbnails or changing processing status.
+    Use this after deploying bbox/edge extraction improvements.
+    """
+    result = await db.execute(
+        select(CadFile).where(
+            CadFile.processing_status == ProcessingStatus.completed,
+            CadFile.stored_path.isnot(None),
+        )
+    )
+    cad_files = result.scalars().all()
+
+    from app.tasks.step_tasks import reextract_cad_metadata
+    queued = 0
+    for cad_file in cad_files:
+        reextract_cad_metadata.delay(str(cad_file.id))
+        queued += 1
+
+    return {"queued": queued, "message": f"Queued {queued} CAD file(s) for metadata re-extraction"}
+
+
 @router.post("/settings/generate-missing-stls", status_code=status.HTTP_202_ACCEPTED)
 async def generate_missing_stls(
     admin: User = Depends(require_admin),
@@ -482,15 +552,25 @@ async def import_existing_media_assets(
     created = 0
     skipped = 0
 
+    from app.config import settings as _app_settings
+
+    def _normalize_key(path: str) -> str:
+        """Strip UPLOAD_DIR prefix to store relative storage keys."""
+        key = str(path)
+        prefix = str(_app_settings.upload_dir).rstrip("/") + "/"
+        return key[len(prefix):] if key.startswith(prefix) else key
+
     # 1. CadFiles with thumbnail_path
+    await db.execute(text("SET LOCAL app.current_tenant_id = 'bypass'"))
     cad_result = await db.execute(
         text("SELECT id, thumbnail_path FROM cad_files WHERE thumbnail_path IS NOT NULL AND processing_status = 'completed'")
     )
     for row in cad_result.fetchall():
         cad_id, thumb_path = row
+        norm_key = _normalize_key(str(thumb_path))
         # De-dup check
         existing = await db.execute(
-            select(MediaAsset.id).where(MediaAsset.storage_key == thumb_path).limit(1)
+            select(MediaAsset.id).where(MediaAsset.storage_key == norm_key).limit(1)
         )
         if existing.scalar_one_or_none():
             skipped += 1
@@ -500,13 +580,14 @@ async def import_existing_media_assets(
         asset = MediaAsset(
             cad_file_id=uuid.UUID(str(cad_id)),
             asset_type=MediaAssetType.thumbnail,
-            storage_key=str(thumb_path),
+            storage_key=norm_key,
             mime_type=mime,
         )
         db.add(asset)
         created += 1
 
     # 2. OrderLines with result_path
+    await db.execute(text("SET LOCAL app.current_tenant_id = 'bypass'"))
     ol_result = await db.execute(
         text("""
             SELECT ol.id, ol.result_path, ol.product_id, COALESCE(ot.is_animation, false) as is_animation
@@ -516,9 +597,10 @@ async def import_existing_media_assets(
         """)
     )
     for row in ol_result.fetchall():
-        ol_id, result_path, product_id, is_animation = row
+        ol_id, result_path, product_id, _is_animation = row
+        norm_key = _normalize_key(str(result_path))
         existing = await db.execute(
-            select(MediaAsset.id).where(MediaAsset.storage_key == result_path).limit(1)
+            select(MediaAsset.id).where(MediaAsset.storage_key == norm_key).limit(1)
         )
         if existing.scalar_one_or_none():
             skipped += 1
@@ -528,13 +610,14 @@ async def import_existing_media_assets(
             mime = "video/mp4"
             asset_type = MediaAssetType.turntable
         else:
+            # Extension determines type — poster frames (.jpg/.png) are always stills
             mime = "image/png" if ext.endswith(".png") else "image/jpeg"
-            asset_type = MediaAssetType.turntable if is_animation else MediaAssetType.still
+            asset_type = MediaAssetType.still
         asset = MediaAsset(
             order_line_id=uuid.UUID(str(ol_id)),
             product_id=uuid.UUID(str(product_id)) if product_id else None,
             asset_type=asset_type,
-            storage_key=str(result_path),
+            storage_key=norm_key,
             mime_type=mime,
         )
         db.add(asset)
diff --git a/backend/app/api/routers/cad.py b/backend/app/api/routers/cad.py
index a7f2e2c..0d77694 100644
--- a/backend/app/api/routers/cad.py
+++ b/backend/app/api/routers/cad.py
@@ -180,6 +180,9 @@ async def get_thumbnail(
     db: AsyncSession = Depends(get_db),
 ):
     """Serve the thumbnail image for a CAD file (no auth — UUID is opaque enough)."""
+    from sqlalchemy import text
+    # Bypass RLS for this public endpoint (cad_files has tenant RLS but thumbnails are public)
+    await db.execute(text("SET LOCAL app.current_tenant_id = 'bypass'"))
     cad = await _get_cad_file(id, db)
 
     if not cad.thumbnail_path:
@@ -196,6 +199,7 @@ async def get_thumbnail(
         path=str(thumb_path),
         media_type=media_type,
         filename=f"{id}{ext}",
+        headers={"Cache-Control": "max-age=3600, public"},
     )
 
 
@@ -390,3 +394,148 @@ async def regenerate_thumbnail(
         "status": "queued",
         "task_id": task_id,
     }
+
+
+@router.get("/{id}/export-gltf-colored")
+async def export_gltf_colored(
+    id: uuid.UUID,
+    user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """Export a GLB with PBR colors from part_colors (material alias mapping).
+
+    Loads per-part STLs from the low-quality parts cache directory and applies
+    PBR materials based on the product's cad_part_materials color assignments.
+    Falls back to the combined STL with a single grey material.
+    """
+    from fastapi.responses import Response
+    from sqlalchemy import text, select
+    import trimesh
+    import io
+
+    if user.role.value not in ("admin", "project_manager"):
+        raise HTTPException(status_code=403, detail="Insufficient permissions")
+
+    # Bypass RLS for cad_files + products
+    await db.execute(text("SET LOCAL app.current_tenant_id = 'bypass'"))
+    cad = await _get_cad_file(id, db)
+
+    if not cad.stored_path:
+        raise HTTPException(404, detail="STEP file not uploaded")
+
+    step_path = Path(cad.stored_path)
+    stl_path = step_path.parent / f"{step_path.stem}_low.stl"
+    parts_dir = step_path.parent / f"{step_path.stem}_low_parts"
+
+    if not stl_path.exists():
+        raise HTTPException(404, detail="STL cache not found. Trigger a render first.")
+
+    # Load settings
+    from app.models.system_setting import SystemSetting
+    settings_result = await db.execute(
+        select(SystemSetting.key, SystemSetting.value).where(
+            SystemSetting.key.in_([
+                "gltf_scale_factor", "gltf_smooth_normals",
+                "gltf_pbr_roughness", "gltf_pbr_metallic",
+            ])
+        )
+    )
+    raw_settings = {k: v for k, v in settings_result.all()}
+    scale = float(raw_settings.get("gltf_scale_factor", "0.001"))
+    smooth = raw_settings.get("gltf_smooth_normals", "true") == "true"
+    roughness = float(raw_settings.get("gltf_pbr_roughness", "0.4"))
+    metallic = float(raw_settings.get("gltf_pbr_metallic", "0.6"))
+
+    # Load part colors from product
+    from app.domains.products.models import Product
+    part_colors: dict[str, str] = {}
+    if cad.id:
+        prod_result = await db.execute(
+            select(Product).where(Product.cad_file_id == cad.id).limit(1)
+        )
+        product = prod_result.scalar_one_or_none()
+        if product and product.cad_part_materials:
+            for entry in product.cad_part_materials:
+                part_name = entry.get("part_name") or entry.get("name", "")
+                hex_color = entry.get("hex_color") or entry.get("color", "")
+                if part_name and hex_color:
+                    part_colors[part_name] = hex_color
+
+    def _hex_to_rgba(h: str) -> list:
+        h = h.lstrip("#")
+        if len(h) < 6:
+            return [0.7, 0.7, 0.7, 1.0]
+        try:
+            return [int(h[i:i+2], 16) / 255.0 for i in (0, 2, 4)] + [1.0]
+        except Exception:
+            return [0.7, 0.7, 0.7, 1.0]
+
+    def _make_material(hex_color: str | None = None):
+        rgba = _hex_to_rgba(hex_color) if hex_color else [0.7, 0.7, 0.7, 1.0]
+        return trimesh.visual.material.PBRMaterial(
+            baseColorFactor=rgba,
+            roughnessFactor=roughness,
+            metallicFactor=metallic,
+        )
+
+    def _apply_mesh(mesh, color=None):
+        mesh.apply_scale(scale)
+        if smooth:
+            try:
+                trimesh.smoothing.filter_laplacian(mesh, lamb=0.5, iterations=5)
+            except Exception:
+                pass
+        mesh.visual = trimesh.visual.TextureVisuals(material=_make_material(color))
+        return mesh
+
+    # Try per-part STLs first
+    scene = trimesh.Scene()
+    used_parts = False
+
+    if parts_dir.exists() and part_colors:
+        for part_name, hex_color in part_colors.items():
+            # Sanitize part name for filesystem
+            safe_name = part_name.replace("/", "_").replace("\\", "_")
+            part_stl = parts_dir / f"{safe_name}.stl"
+            if not part_stl.exists():
+                # Try lowercase / partial match
+                candidates = list(parts_dir.glob(f"{safe_name}*.stl"))
+                if not candidates:
+                    candidates = list(parts_dir.glob("*.stl"))
+                    candidates = [c for c in candidates if safe_name.lower() in c.stem.lower()]
+                if candidates:
+                    part_stl = candidates[0]
+                else:
+                    continue
+            try:
+                m = trimesh.load(str(part_stl), force="mesh")
+                _apply_mesh(m, hex_color)
+                scene.add_geometry(m, geom_name=part_name)
+                used_parts = True
+            except Exception:
+                pass
+
+    if not used_parts:
+        # Fallback: combined STL, single color
+        combined = trimesh.load(str(stl_path))
+        if hasattr(combined, 'geometry'):
+            for name, m in combined.geometry.items():
+                _apply_mesh(m, next(iter(part_colors.values()), None))
+                scene.add_geometry(m, geom_name=name)
+        else:
+            _apply_mesh(combined, next(iter(part_colors.values()), None))
+            scene.add_geometry(combined)
+
+    # Export to bytes
+    buf = io.BytesIO()
+    scene.export(buf, file_type="glb")
+    glb_bytes = buf.getvalue()
+
+    original_stem = Path(cad.original_name or "model").stem
+    filename = f"{original_stem}_colored.glb"
+
+    return Response(
+        content=glb_bytes,
+        media_type="model/gltf-binary",
+        headers={"Content-Disposition": f"attachment; filename={filename}"},
+    )
diff --git a/backend/app/api/routers/products.py b/backend/app/api/routers/products.py
index 8c1a7a3..0259458 100644
--- a/backend/app/api/routers/products.py
+++ b/backend/app/api/routers/products.py
@@ -75,6 +75,7 @@ def _product_out(product: Product, priority: list[str] | None = None) -> Product
     out.thumbnail_url = product.thumbnail_url
     out.processing_status = product.processing_status
     out.cad_parsed_objects = product.cad_parsed_objects
+    out.cad_mesh_attributes = product.cad_file.mesh_attributes if product.cad_file else None
     out.render_image_url = _best_render_url(product, priority or ["latest_render", "cad_thumbnail"])
     out.stl_cached = _stl_cached_qualities(product)
     return out
diff --git a/backend/app/domains/media/router.py b/backend/app/domains/media/router.py
index 799fbe8..0e8b6b6 100644
--- a/backend/app/domains/media/router.py
+++ b/backend/app/domains/media/router.py
@@ -9,9 +9,11 @@ from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.database import get_db
+from app.domains.auth.models import User
 from app.domains.media.models import MediaAsset, MediaAssetType
 from app.domains.media.schemas import MediaAssetOut
 from app.domains.media import service
+from app.utils.auth import get_current_user
 
 router = APIRouter(prefix="/api/media", tags=["media"], redirect_slashes=False)
 
@@ -44,6 +46,9 @@ async def _resolve_thumbnails_bulk(db: AsyncSession, assets: list) -> None:
 
     # 2. Fallback: product's cad_file_id → CAD thumbnail endpoint
     from app.domains.products.models import Product
+    from sqlalchemy import text
+    # products has RLS — bypass for this internal read-only lookup
+    await db.execute(text("SET LOCAL app.current_tenant_id = 'bypass'"))
     prod_rows = await db.execute(
         select(Product.id, Product.cad_file_id).where(Product.id.in_(product_ids))
     )
@@ -69,6 +74,9 @@ async def list_assets(
     asset_types: list[MediaAssetType] = Query(default=[]),
     skip: int = Query(0, ge=0),
     limit: int = Query(50, ge=1, le=500),
+    sort_by: str = Query("created_at"),
+    sort_dir: str = Query("desc"),
+    _user: User = Depends(get_current_user),
     db: AsyncSession = Depends(get_db),
 ):
     assets = await service.list_media_assets(
@@ -80,6 +88,8 @@ async def list_assets(
         asset_types=asset_types if asset_types else None,
         skip=skip,
         limit=limit,
+        sort_by=sort_by,
+        sort_dir=sort_dir,
     )
     for a in assets:
         a.download_url = service.get_download_url(a)
@@ -100,7 +110,11 @@ async def get_asset(asset_id: uuid.UUID, db: AsyncSession = Depends(get_db)):
 
 
 @router.api_route("/{asset_id}/download", methods=["GET", "HEAD"])
-async def download_asset(asset_id: uuid.UUID, db: AsyncSession = Depends(get_db)):
+async def download_asset(
+    asset_id: uuid.UUID,
+    _user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
     """Proxy file content directly — avoids internal MinIO hostname issues."""
     from fastapi.responses import FileResponse, Response
     from pathlib import Path
@@ -112,14 +126,28 @@ async def download_asset(asset_id: uuid.UUID, db: AsyncSession = Depends(get_db)
     mime = asset.mime_type or "application/octet-stream"
 
     # Local file path (absolute or relative to UPLOAD_DIR)
+    from app.config import settings
     candidate = Path(key)
     if not candidate.is_absolute():
-        from app.config import settings
-        candidate = Path(settings.UPLOAD_DIR) / key
+        candidate = Path(settings.upload_dir) / key
+    # Legacy path remapping: /shared/renders/{uuid}/{file} → UPLOAD_DIR/renders/{uuid}/{file}
+    if not candidate.exists() and "/shared/renders/" in key:
+        import logging
+        parts = key.split("/")
+        if len(parts) >= 2:
+            remapped = Path(settings.upload_dir) / "renders" / parts[-2] / parts[-1]
+            if remapped.exists():
+                logging.getLogger(__name__).warning(
+                    "Remapped legacy path %s → %s", key, remapped
+                )
+                candidate = remapped
     if candidate.exists():
         ext = candidate.suffix.lstrip(".")
         fname = f"{asset.asset_type.value}_{asset_id}.{ext or 'bin'}"
-        return FileResponse(str(candidate), media_type=mime, filename=fname)
+        return FileResponse(
+            str(candidate), media_type=mime, filename=fname,
+            headers={"Cache-Control": "max-age=3600, public"},
+        )
 
     # Fall back to MinIO
     try:
@@ -130,7 +158,10 @@ async def download_asset(asset_id: uuid.UUID, db: AsyncSession = Depends(get_db)
         return Response(
             content=data,
             media_type=mime,
-            headers={"Content-Disposition": f"attachment; filename={fname}"},
+            headers={
+                "Content-Disposition": f"attachment; filename={fname}",
+                "Cache-Control": "max-age=3600, public",
+            },
         )
     except Exception:
         raise HTTPException(404, "File not available")
@@ -139,6 +170,7 @@ async def download_asset(asset_id: uuid.UUID, db: AsyncSession = Depends(get_db)
 @router.post("/zip")
 async def zip_download(
     asset_ids: list[uuid.UUID],
+    _user: User = Depends(get_current_user),
     db: AsyncSession = Depends(get_db),
 ):
     assets = []
@@ -150,18 +182,42 @@ async def zip_download(
         raise HTTPException(404, "No assets found")
 
     def generate():
+        import logging
+        from pathlib import Path
+        from app.core.storage import get_storage
+        logger = logging.getLogger(__name__)
         buf = io.BytesIO()
+        seen_names: dict[str, int] = {}
         with zipfile.ZipFile(buf, "w", zipfile.ZIP_DEFLATED) as zf:
-            from app.core.storage import get_storage
             storage = get_storage()
             for a in assets:
-                ext = (a.mime_type or "").split("/")[-1] or "bin"
-                fname = f"{a.asset_type.value}_{a.id}.{ext}"
+                key = a.storage_key
+                # Use filename from storage_key (always has correct extension)
+                original_name = Path(key).name
+                ext = Path(key).suffix.lstrip(".") or (a.mime_type or "").split("/")[-1] or "bin"
+                base = original_name if original_name else f"{a.asset_type.value}_{a.id}.{ext}"
+                # Deduplicate filenames within the ZIP
+                if base in seen_names:
+                    seen_names[base] += 1
+                    stem = Path(base).stem
+                    suffix = Path(base).suffix
+                    fname = f"{stem}_{seen_names[base]}{suffix}"
+                else:
+                    seen_names[base] = 0
+                    fname = base
                 try:
-                    data = storage.download_bytes(a.storage_key)
+                    # Check absolute path first (local filesystem)
+                    candidate = Path(key)
+                    if not candidate.is_absolute():
+                        from app.config import settings
+                        candidate = Path(settings.upload_dir) / key
+                    if candidate.exists():
+                        data = candidate.read_bytes()
+                    else:
+                        data = storage.download_bytes(key)
                     zf.writestr(fname, data)
-                except Exception:
-                    pass
+                except Exception as exc:
+                    logger.warning("ZIP: skipping asset %s — %s", a.id, exc)
         yield buf.getvalue()
 
     return StreamingResponse(
@@ -177,3 +233,12 @@ async def archive_asset(asset_id: uuid.UUID, db: AsyncSession = Depends(get_db))
     if not asset:
         raise HTTPException(404, "Asset not found")
     return {"ok": True}
+
+
+@router.delete("/{asset_id}/permanent")
+async def delete_asset_permanent(asset_id: uuid.UUID, db: AsyncSession = Depends(get_db)):
+    """Permanently remove a MediaAsset record from the database."""
+    deleted = await service.delete_media_asset(db, asset_id)
+    if not deleted:
+        raise HTTPException(404, "Asset not found")
+    return {"ok": True}
diff --git a/backend/app/domains/media/service.py b/backend/app/domains/media/service.py
index 3bd37da..3bdc20c 100644
--- a/backend/app/domains/media/service.py
+++ b/backend/app/domains/media/service.py
@@ -5,6 +5,13 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.domains.media.models import MediaAsset, MediaAssetType
 
 
+_SORT_COLUMNS = {
+    "created_at": MediaAsset.created_at,
+    "file_size_bytes": MediaAsset.file_size_bytes,
+    "storage_key": MediaAsset.storage_key,
+}
+
+
 async def list_media_assets(
     db: AsyncSession,
     product_id: uuid.UUID | None = None,
@@ -15,8 +22,13 @@ async def list_media_assets(
     is_archived: bool | None = False,
     skip: int = 0,
     limit: int = 50,
+    sort_by: str = "created_at",
+    sort_dir: str = "desc",
 ) -> list[MediaAsset]:
-    q = select(MediaAsset).order_by(MediaAsset.created_at.desc())
+    from sqlalchemy import asc, desc
+    col = _SORT_COLUMNS.get(sort_by, MediaAsset.created_at)
+    order = desc(col) if sort_dir == "desc" else asc(col)
+    q = select(MediaAsset).order_by(order)
     if product_id:
         q = q.where(MediaAsset.product_id == product_id)
     if order_line_id:
diff --git a/backend/app/domains/products/schemas.py b/backend/app/domains/products/schemas.py
index 233d6ff..bd7bc86 100644
--- a/backend/app/domains/products/schemas.py
+++ b/backend/app/domains/products/schemas.py
@@ -61,6 +61,7 @@ class ProductOut(BaseModel):
     processing_status: str | None = None
     stl_cached: list[str] = []
     cad_parsed_objects: list[str] | None = None
+    cad_mesh_attributes: dict | None = None
     arbeitspaket: str | None = None
     notes: str | None
     is_active: bool
diff --git a/backend/app/domains/rendering/dispatch_service.py b/backend/app/domains/rendering/dispatch_service.py
index 2b7edda..52a185e 100644
--- a/backend/app/domains/rendering/dispatch_service.py
+++ b/backend/app/domains/rendering/dispatch_service.py
@@ -87,6 +87,30 @@ def dispatch_render_with_workflow(order_line_id: str) -> dict:
             workflow_type,
         )
 
+        # For turntable workflows: resolve step_path + output_dir from the order line at runtime
+        if workflow_type == "turntable" and ("step_path" not in params or "output_dir" not in params):
+            from app.domains.products.models import CadFile as _CadFile
+            from pathlib import Path as _Path
+            from app.config import settings as _cfg
+            _product = line.product if hasattr(line, "product") else None
+            if _product is None:
+                from sqlalchemy.orm import selectinload as _si
+                from app.domains.orders.models import OrderLine as _OL
+                _line_full = session.execute(
+                    select(_OL).where(_OL.id == line.id).options(_si(_OL.product))
+                ).scalar_one_or_none()
+                _product = _line_full.product if _line_full else None
+            if _product and _product.cad_file_id:
+                _cad = session.execute(
+                    select(_CadFile).where(_CadFile.id == _product.cad_file_id)
+                ).scalar_one_or_none()
+                if _cad and _cad.stored_path:
+                    params.setdefault("step_path", _cad.stored_path)
+                    params.setdefault(
+                        "output_dir",
+                        str(_Path(_cfg.upload_dir) / "renders" / str(line.id)),
+                    )
+
         from app.domains.rendering.workflow_builder import dispatch_workflow
         celery_task_id = dispatch_workflow(workflow_type, order_line_id, params)
 
diff --git a/backend/app/domains/rendering/tasks.py b/backend/app/domains/rendering/tasks.py
index 53f2e81..81a6212 100644
--- a/backend/app/domains/rendering/tasks.py
+++ b/backend/app/domains/rendering/tasks.py
@@ -15,6 +15,36 @@ from app.core.task_logs import log_task_event
 logger = logging.getLogger(__name__)
 
 
+def _update_workflow_run_status(order_line_id: str, status: str, error: str | None = None) -> None:
+    """Update the most recent WorkflowRun for an order_line after task completion."""
+    try:
+        import asyncio
+        from datetime import datetime as _dt
+
+        async def _run():
+            from app.database import AsyncSessionLocal
+            from app.domains.rendering.models import WorkflowRun
+            from sqlalchemy import select as _sel
+            async with AsyncSessionLocal() as db:
+                res = await db.execute(
+                    _sel(WorkflowRun)
+                    .where(WorkflowRun.order_line_id == order_line_id)
+                    .order_by(WorkflowRun.created_at.desc())
+                    .limit(1)
+                )
+                run = res.scalar_one_or_none()
+                if run and run.status == "pending":
+                    run.status = status
+                    run.completed_at = _dt.utcnow()
+                    if error:
+                        run.error_message = error[:2000]
+                    await db.commit()
+
+        asyncio.get_event_loop().run_until_complete(_run())
+    except Exception as _exc:
+        logger.warning("Failed to update WorkflowRun status for line %s: %s", order_line_id, _exc)
+
+
 @celery_app.task(
     bind=True,
     name="app.domains.rendering.tasks.render_still_task",
@@ -291,6 +321,7 @@ def publish_asset(
         from app.database import AsyncSessionLocal
         from app.domains.media.models import MediaAsset, MediaAssetType
         from app.domains.orders.models import OrderLine
+        from app.domains.products.models import Product
         from sqlalchemy import select
 
         async with AsyncSessionLocal() as db:
@@ -298,9 +329,20 @@ def publish_asset(
             line = res.scalar_one_or_none()
             if not line:
                 return None
+
+            # Resolve cad_file_id from the linked product
+            cad_file_id = None
+            if line.product_id:
+                prod_res = await db.execute(select(Product).where(Product.id == line.product_id))
+                product = prod_res.scalar_one_or_none()
+                if product:
+                    cad_file_id = product.cad_file_id
+
             asset = MediaAsset(
                 tenant_id=getattr(line, "tenant_id", None),
                 order_line_id=line.id,
+                product_id=line.product_id,
+                cad_file_id=cad_file_id,
                 asset_type=MediaAssetType(asset_type),
                 storage_key=storage_key,
                 render_config=render_config,
@@ -396,6 +438,7 @@ def render_order_line_still_task(self, order_line_id: str, **params) -> dict:
             })
         except Exception:
             pass
+        _update_workflow_run_status(order_line_id, "completed")
         return result
     except Exception as exc:
         log_task_event(self.request.id, f"Failed: {exc}", "error")
@@ -409,6 +452,7 @@ def render_order_line_still_task(self, order_line_id: str, **params) -> dict:
             })
         except Exception:
             pass
+        _update_workflow_run_status(order_line_id, "failed", str(exc))
         raise self.retry(exc=exc, countdown=30)
 
 
@@ -448,6 +492,29 @@ def export_gltf_for_order_line_task(self, order_line_id: str) -> dict:
 
     asset_type = "gltf_geometry"
 
+    # Load sharp edge hints from mesh_attributes for UV seam marking
+    sharp_edges_json = "[]"
+    if cad_file_id:
+        try:
+            import asyncio as _asyncio
+
+            async def _load_mesh_attrs() -> list:
+                from app.database import AsyncSessionLocal
+                from app.models.cad_file import CadFile as _CF
+                from sqlalchemy import select as _sel
+                async with AsyncSessionLocal() as _db:
+                    _res = await _db.execute(_sel(_CF).where(_CF.id == cad_file_id))
+                    _cad = _res.scalar_one_or_none()
+                    if _cad and _cad.mesh_attributes:
+                        return _cad.mesh_attributes.get("sharp_edge_midpoints") or []
+                    return []
+
+            _midpoints = _asyncio.get_event_loop().run_until_complete(_load_mesh_attrs())
+            if _midpoints:
+                sharp_edges_json = json.dumps(_midpoints)
+        except Exception as _exc:
+            logger.warning("Could not load sharp_edge_midpoints for %s: %s", cad_file_id, _exc)
+
     if is_blender_available() and export_script.exists():
         blender_bin = find_blender()
         cmd = [
@@ -458,6 +525,7 @@ def export_gltf_for_order_line_task(self, order_line_id: str) -> dict:
             "--output_path", str(output_path),
             "--asset_library_blend", "",
             "--material_map", json.dumps({}),
+            "--sharp_edges_json", sharp_edges_json,
         ]
         try:
             result = subprocess.run(cmd, capture_output=True, text=True, timeout=300)
diff --git a/backend/app/services/step_processor.py b/backend/app/services/step_processor.py
index 34a5e64..4c68615 100644
--- a/backend/app/services/step_processor.py
+++ b/backend/app/services/step_processor.py
@@ -293,8 +293,33 @@ def extract_mesh_edge_data(step_path: str) -> dict:
             except Exception:
                 continue
 
+        # Bounding box extraction (OCC Bnd_Box)
+        from OCC.Core.Bnd import Bnd_Box
+        from OCC.Core.BRepBndLib import brepbndlib
+        try:
+            bbox = Bnd_Box()
+            brepbndlib.Add(shape, bbox)
+            xmin, ymin, zmin, xmax, ymax, zmax = bbox.Get()
+            dimensions_mm = {
+                "x": round(xmax - xmin, 2),
+                "y": round(ymax - ymin, 2),
+                "z": round(zmax - zmin, 2),
+            }
+            bbox_center_mm = {
+                "x": round((xmin + xmax) / 2, 2),
+                "y": round((ymin + ymax) / 2, 2),
+                "z": round((zmin + zmax) / 2, 2),
+            }
+        except Exception:
+            dimensions_mm = None
+            bbox_center_mm = None
+
         if not dihedral_angles:
-            return {}
+            result: dict = {}
+            if dimensions_mm:
+                result["dimensions_mm"] = dimensions_mm
+                result["bbox_center_mm"] = bbox_center_mm
+            return result
 
         import statistics
         median_angle = statistics.median(dihedral_angles)
@@ -307,11 +332,15 @@ def extract_mesh_edge_data(step_path: str) -> dict:
         else:
             suggested = 30.0
 
-        return {
+        result = {
             "suggested_smooth_angle": round(suggested, 1),
             "has_mechanical_edges": max_angle > 45,
             "sharp_edge_midpoints": sharp_midpoints[:500],
         }
+        if dimensions_mm:
+            result["dimensions_mm"] = dimensions_mm
+            result["bbox_center_mm"] = bbox_center_mm
+        return result
     except ImportError:
         # OCC not available (e.g. in backend container)
         return {}
diff --git a/backend/app/tasks/step_tasks.py b/backend/app/tasks/step_tasks.py
index 41314c7..3448082 100644
--- a/backend/app/tasks/step_tasks.py
+++ b/backend/app/tasks/step_tasks.py
@@ -1,11 +1,76 @@
 """Celery tasks for STEP file processing and thumbnail generation."""
 import logging
+import struct
+from pathlib import Path
 from app.tasks.celery_app import celery_app
 from app.core.task_logs import log_task_event
 
 logger = logging.getLogger(__name__)
 
 
+def _bbox_from_stl(stl_path: str) -> dict | None:
+    """Extract bounding box from a cached binary STL file.
+
+    Returns {"dimensions_mm": {x,y,z}, "bbox_center_mm": {x,y,z}} or None on failure.
+    Reading vertex extremes from an existing STL is ~10-100× faster than re-parsing STEP.
+    """
+    try:
+        import numpy as np
+        p = Path(stl_path)
+        if not p.exists() or p.stat().st_size < 84:
+            return None
+        with p.open("rb") as f:
+            f.seek(80)  # skip 80-byte header
+            n = struct.unpack("<I", f.read(4))[0]
+            if n == 0:
+                return None
+            raw = f.read(n * 50)  # 50 bytes per triangle
+        # Binary STL per-triangle layout: normal(12B) + v1(12B) + v2(12B) + v3(12B) + attr(2B) = 50B
+        # Extract vertex bytes (columns 12..48 of each 50-byte row)
+        arr = np.frombuffer(raw, dtype=np.uint8).reshape(n, 50)
+        verts = np.frombuffer(arr[:, 12:48].tobytes(), dtype=np.float32).reshape(-1, 3)
+        mins = verts.min(axis=0)
+        maxs = verts.max(axis=0)
+        dims = maxs - mins
+        return {
+            "dimensions_mm": {
+                "x": round(float(dims[0]), 2),
+                "y": round(float(dims[1]), 2),
+                "z": round(float(dims[2]), 2),
+            },
+            "bbox_center_mm": {
+                "x": round(float((mins[0] + maxs[0]) / 2), 2),
+                "y": round(float((mins[1] + maxs[1]) / 2), 2),
+                "z": round(float((mins[2] + maxs[2]) / 2), 2),
+            },
+        }
+    except Exception as exc:
+        logger.debug(f"_bbox_from_stl failed for {stl_path}: {exc}")
+        return None
+
+
+def _bbox_from_step_cadquery(step_path: str) -> dict | None:
+    """Fallback: extract bounding box by re-parsing STEP via cadquery."""
+    try:
+        import cadquery as cq
+        bb = cq.importers.importStep(step_path).val().BoundingBox()
+        return {
+            "dimensions_mm": {
+                "x": round(bb.xlen, 2),
+                "y": round(bb.ylen, 2),
+                "z": round(bb.zlen, 2),
+            },
+            "bbox_center_mm": {
+                "x": round((bb.xmin + bb.xmax) / 2, 2),
+                "y": round((bb.ymin + bb.ymax) / 2, 2),
+                "z": round((bb.zmin + bb.zmax) / 2, 2),
+            },
+        }
+    except Exception as exc:
+        logger.debug(f"_bbox_from_step_cadquery failed for {step_path}: {exc}")
+        return None
+
+
 @celery_app.task(bind=True, name="app.tasks.step_tasks.process_step_file", queue="step_processing")
 def process_step_file(self, cad_file_id: str):
     """Process a STEP file: extract objects, generate thumbnail, convert to glTF.
@@ -164,6 +229,42 @@ def render_step_thumbnail(self, cad_file_id: str):
         logger.error(f"Thumbnail render failed for {cad_file_id}: {exc}")
         raise self.retry(exc=exc, countdown=30, max_retries=2)
 
+    # Extract bounding box from the STL that was just cached by the renderer.
+    # STL binary parsing is near-instant (numpy min/max) vs re-parsing the STEP file.
+    # Falls back to cadquery STEP re-parse if STL is not found.
+    try:
+        from sqlalchemy import create_engine
+        from sqlalchemy.orm import Session
+        from app.config import settings as _cfg2
+        from app.models.cad_file import CadFile as _CadFile2
+
+        _sync_url2 = _cfg2.database_url.replace("+asyncpg", "")
+        _eng2 = create_engine(_sync_url2)
+        with Session(_eng2) as _sess2:
+            _cad2 = _sess2.get(_CadFile2, cad_file_id)
+            _step_path = _cad2.stored_path if _cad2 else None
+        _eng2.dispose()
+
+        if _step_path and not (_cad2.mesh_attributes or {}).get("dimensions_mm"):
+            _step = Path(_step_path)
+            _stl = _step.parent / f"{_step.stem}_low.stl"
+            bbox_data = _bbox_from_stl(str(_stl)) or _bbox_from_step_cadquery(_step_path)
+            if bbox_data:
+                _eng2 = create_engine(_sync_url2)
+                with Session(_eng2) as _sess2:
+                    _cad2 = _sess2.get(_CadFile2, cad_file_id)
+                    if _cad2:
+                        _cad2.mesh_attributes = {**(  _cad2.mesh_attributes or {}), **bbox_data}
+                        _sess2.commit()
+                        dims = bbox_data["dimensions_mm"]
+                        logger.info(
+                            f"bbox for {cad_file_id}: "
+                            f"{dims['x']}×{dims['y']}×{dims['z']} mm"
+                        )
+                _eng2.dispose()
+    except Exception:
+        logger.exception(f"bbox extraction failed for {cad_file_id} (non-fatal)")
+
     # Auto-populate materials now that parsed_objects are available
     try:
         _auto_populate_materials_for_cad(cad_file_id)
@@ -195,6 +296,52 @@ def render_step_thumbnail(self, cad_file_id: str):
         logger.debug("WebSocket publish for CAD complete skipped (non-fatal)")
 
 
+@celery_app.task(name="app.tasks.step_tasks.reextract_cad_metadata", queue="thumbnail_rendering")
+def reextract_cad_metadata(cad_file_id: str):
+    """Re-extract bounding-box dimensions for an already-completed CAD file.
+
+    Uses cadquery (available in render-worker) to compute dimensions_mm.
+    Updates mesh_attributes without changing processing_status or re-rendering.
+    Safe to run on completed files.
+    """
+    from sqlalchemy import create_engine
+    from sqlalchemy.orm import Session
+    from app.config import settings as app_settings
+    from app.models.cad_file import CadFile
+
+    sync_url = app_settings.database_url.replace("+asyncpg", "")
+    eng = create_engine(sync_url)
+    with Session(eng) as session:
+        cad_file = session.get(CadFile, cad_file_id)
+        if not cad_file or not cad_file.stored_path:
+            logger.warning(f"reextract_cad_metadata: file not found {cad_file_id}")
+            eng.dispose()
+            return
+        step_path = cad_file.stored_path
+
+    try:
+        p = Path(step_path)
+        stl_path = p.parent / f"{p.stem}_low.stl"
+        patch = _bbox_from_stl(str(stl_path)) or _bbox_from_step_cadquery(step_path)
+        if patch:
+            with Session(eng) as session:
+                cad_file = session.get(CadFile, cad_file_id)
+                if cad_file:
+                    cad_file.mesh_attributes = {**(cad_file.mesh_attributes or {}), **patch}
+                    session.commit()
+                    dims = patch["dimensions_mm"]
+                    logger.info(
+                        f"reextract_cad_metadata: {cad_file_id} → "
+                        f"{dims['x']}×{dims['y']}×{dims['z']} mm"
+                    )
+        else:
+            logger.warning(f"reextract_cad_metadata: no bbox data for {cad_file_id}")
+    except Exception as exc:
+        logger.error(f"reextract_cad_metadata failed for {cad_file_id}: {exc}")
+    finally:
+        eng.dispose()
+
+
 @celery_app.task(bind=True, name="app.tasks.step_tasks.generate_stl_cache", queue="thumbnail_rendering")
 def generate_stl_cache(self, cad_file_id: str, quality: str):
     """Generate and cache STL for a CAD file without triggering a full render."""
@@ -267,6 +414,15 @@ def generate_gltf_geometry_task(self, cad_file_id: str):
             logger.error("generate_gltf_geometry_task: no stored_path for %s", cad_file_id)
             return
         step_path_str = cad_file.stored_path
+
+        # Read 3D export settings
+        from sqlalchemy import text as _text
+        _scale = float(session.execute(_text(
+            "SELECT value FROM system_settings WHERE key='gltf_scale_factor'"
+        )).scalar() or "0.001")
+        _smooth = (session.execute(_text(
+            "SELECT value FROM system_settings WHERE key='gltf_smooth_normals'"
+        )).scalar() or "true") == "true"
     eng.dispose()
 
     log_task_event(self.request.id, f"Starting generate_gltf_geometry_task: cad_file={cad_file_id}", "info")
@@ -280,7 +436,25 @@ def generate_gltf_geometry_task(self, cad_file_id: str):
     output_path = step.parent / f"{step.stem}_geometry.glb"
     try:
         import trimesh
+        import trimesh as _trimesh
+
+        def _process_mesh(m):
+            m.apply_scale(_scale)
+            if _smooth:
+                try:
+                    _trimesh.smoothing.filter_laplacian(m, lamb=0.5, iterations=5)
+                except Exception:
+                    pass  # non-critical
+
         mesh = trimesh.load(str(stl_path))
+
+        if hasattr(mesh, 'geometry'):
+            # trimesh.Scene with multiple sub-meshes
+            for sub in mesh.geometry.values():
+                _process_mesh(sub)
+        else:
+            _process_mesh(mesh)
+
         mesh.export(str(output_path))
         log_task_event(self.request.id, f"Completed successfully: {output_path.name}", "done")
         logger.info("generate_gltf_geometry_task: exported %s", output_path.name)
@@ -295,12 +469,17 @@ def generate_gltf_geometry_task(self, cad_file_id: str):
     async def _store():
         from app.database import AsyncSessionLocal
         from app.domains.media.models import MediaAsset, MediaAssetType
+        from app.config import settings as _cfg
         async with AsyncSessionLocal() as db:
             import uuid
+            _key = str(output_path)
+            _prefix = str(_cfg.upload_dir).rstrip("/") + "/"
+            if _key.startswith(_prefix):
+                _key = _key[len(_prefix):]
             asset = MediaAsset(
                 cad_file_id=uuid.UUID(cad_file_id),
                 asset_type=MediaAssetType.gltf_geometry,
-                storage_key=str(output_path),
+                storage_key=_key,
                 mime_type="model/gltf-binary",
                 file_size_bytes=output_path.stat().st_size if output_path.exists() else None,
             )
@@ -648,13 +827,18 @@ def render_order_line_task(self, order_line_id: str):
                 # Create MediaAsset so the render appears in the Media Browser
                 try:
                     from app.domains.media.models import MediaAsset, MediaAssetType as MAT
+                    from app.config import settings as _cfg2
                     _ext = str(output_path).rsplit(".", 1)[-1].lower() if "." in str(output_path) else "bin"
                     _mime = "video/mp4" if _ext in ("mp4", "webm") else ("image/jpeg" if _ext in ("jpg", "jpeg") else "image/png")
-                    _is_anim = bool(line.output_type and line.output_type.is_animation)
-                    _at = MAT.turntable if _is_anim else MAT.still
+                    # Extension determines type — poster frames (.jpg/.png) from animations are still stills
+                    _at = MAT.turntable if _ext in ("mp4", "webm") else MAT.still
                     _tenant_id = line.product.cad_file.tenant_id if (line.product and line.product.cad_file) else None
+                    # Normalize storage_key to relative path
+                    _raw_key = str(output_path)
+                    _upload_prefix = str(_cfg2.upload_dir).rstrip("/") + "/"
+                    _norm_key = _raw_key[len(_upload_prefix):] if _raw_key.startswith(_upload_prefix) else _raw_key
                     _existing = session.execute(
-                        select(MediaAsset.id).where(MediaAsset.storage_key == output_path).limit(1)
+                        select(MediaAsset.id).where(MediaAsset.storage_key == _norm_key).limit(1)
                     ).scalar_one_or_none()
                     if not _existing:
                         _asset = MediaAsset(
@@ -662,7 +846,7 @@ def render_order_line_task(self, order_line_id: str):
                             order_line_id=line.id,
                             product_id=line.product_id,
                             asset_type=_at,
-                            storage_key=output_path,
+                            storage_key=_norm_key,
                             mime_type=_mime,
                         )
                         session.add(_asset)
diff --git a/frontend/src/api/cad.ts b/frontend/src/api/cad.ts
index 0210691..574f56b 100644
--- a/frontend/src/api/cad.ts
+++ b/frontend/src/api/cad.ts
@@ -118,3 +118,15 @@ export async function generateGltfGeometry(cadFileId: string): Promise<GenerateG
   const res = await api.post<GenerateGltfResponse>(`/cad/${cadFileId}/generate-gltf-geometry`)
   return res.data
 }
+
+export const exportGltfColored = (id: string): Promise<void> =>
+  api.get(`/cad/${id}/export-gltf-colored`, { responseType: 'blob' }).then(r => {
+    const url = URL.createObjectURL(r.data)
+    const a = document.createElement('a')
+    a.href = url
+    a.download = `${id}_colored.glb`
+    document.body.appendChild(a)
+    a.click()
+    document.body.removeChild(a)
+    URL.revokeObjectURL(url)
+  })
diff --git a/frontend/src/api/media.ts b/frontend/src/api/media.ts
index 878de05..07873da 100644
--- a/frontend/src/api/media.ts
+++ b/frontend/src/api/media.ts
@@ -38,6 +38,8 @@ export interface MediaFilter {
   asset_types?: MediaAssetType[]
   skip?: number
   limit?: number
+  sort_by?: string
+  sort_dir?: 'asc' | 'desc'
 }
 
 export const getMediaAssets = (filters: MediaFilter = {}): Promise<MediaAsset[]> => {
@@ -48,6 +50,8 @@ export const getMediaAssets = (filters: MediaFilter = {}): Promise<MediaAsset[]>
   if (filters.asset_types?.length) filters.asset_types.forEach(t => params.append('asset_types', t))
   if (filters.skip !== undefined) params.set('skip', String(filters.skip))
   if (filters.limit !== undefined) params.set('limit', String(filters.limit))
+  if (filters.sort_by) params.set('sort_by', filters.sort_by)
+  if (filters.sort_dir) params.set('sort_dir', filters.sort_dir)
   return api.get(`/media/?${params}`).then(r => r.data)
 }
 
@@ -65,8 +69,11 @@ export const zipDownloadAssets = (ids: string[]): Promise<void> =>
     a.href = url
     a.download = 'media-export.zip'
     a.click()
-    URL.revokeObjectURL(url)
+    setTimeout(() => URL.revokeObjectURL(url), 100)
   })
 
 export const archiveMediaAsset = (id: string): Promise<void> =>
   api.delete(`/media/${id}`).then(() => undefined)
+
+export const deleteMediaAssetPermanent = (id: string): Promise<void> =>
+  api.delete(`/media/${id}/permanent`).then(() => undefined)
diff --git a/frontend/src/api/products.ts b/frontend/src/api/products.ts
index d68a834..2d2110f 100644
--- a/frontend/src/api/products.ts
+++ b/frontend/src/api/products.ts
@@ -57,6 +57,13 @@ export interface Product {
   processing_status: string | null
   stl_cached: string[]
   cad_parsed_objects: string[] | null
+  cad_mesh_attributes?: {
+    dimensions_mm?: { x: number; y: number; z: number }
+    bbox_center_mm?: { x: number; y: number; z: number }
+    suggested_smooth_angle?: number
+    has_mechanical_edges?: boolean
+    sharp_edge_midpoints?: number[][]
+  } | null
   arbeitspaket: string | null
   notes: string | null
   is_active: boolean
diff --git a/frontend/src/components/cad/InlineCadViewer.tsx b/frontend/src/components/cad/InlineCadViewer.tsx
new file mode 100644
index 0000000..238d615
--- /dev/null
+++ b/frontend/src/components/cad/InlineCadViewer.tsx
@@ -0,0 +1,128 @@
+import { Suspense, useEffect, useState } from 'react'
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
+import { Canvas } from '@react-three/fiber'
+import { OrbitControls, useGLTF } from '@react-three/drei'
+import { Loader2, Box, RefreshCw } from 'lucide-react'
+import { toast } from 'sonner'
+import { getMediaAssets } from '../../api/media'
+import { generateGltfGeometry } from '../../api/cad'
+import { useAuthStore } from '../../store/auth'
+
+function GlbModel({ url }: { url: string }) {
+  const { scene } = useGLTF(url)
+  return <primitive object={scene} />
+}
+
+export default function InlineCadViewer({
+  cadFileId,
+  thumbnailUrl,
+}: {
+  cadFileId: string
+  thumbnailUrl?: string | null
+}) {
+  const token = useAuthStore((s) => s.token)
+  const qc = useQueryClient()
+  const [glbBlobUrl, setGlbBlobUrl] = useState<string | null>(null)
+  const [loadingGlb, setLoadingGlb] = useState(false)
+  const [generating, setGenerating] = useState(false)
+
+  const { data: gltfAssets } = useQuery({
+    queryKey: ['media-assets', cadFileId, 'gltf_geometry'],
+    queryFn: () => getMediaAssets({ cad_file_id: cadFileId, asset_types: ['gltf_geometry'] }),
+    staleTime: 30_000,
+    refetchInterval: generating ? 4_000 : false,
+  })
+
+  // Stop polling once asset appears
+  useEffect(() => {
+    if (generating && gltfAssets && gltfAssets.length > 0) setGenerating(false)
+  }, [generating, gltfAssets])
+
+  const latestAsset = gltfAssets?.[0]
+  const downloadUrl = latestAsset?.download_url
+
+  // Fetch GLB with auth when download URL is available
+  useEffect(() => {
+    if (!downloadUrl || !token) return
+    setLoadingGlb(true)
+    let blobUrl = ''
+    fetch(downloadUrl, { headers: { Authorization: `Bearer ${token}` } })
+      .then((r) => r.blob())
+      .then((blob) => {
+        blobUrl = URL.createObjectURL(blob)
+        setGlbBlobUrl(blobUrl)
+      })
+      .catch(() => toast.error('Failed to load 3D model'))
+      .finally(() => setLoadingGlb(false))
+    return () => {
+      if (blobUrl) URL.revokeObjectURL(blobUrl)
+    }
+  }, [downloadUrl, token])
+
+  const generateMut = useMutation({
+    mutationFn: () => generateGltfGeometry(cadFileId),
+    onSuccess: () => {
+      toast.info('Generating 3D model…')
+      setGenerating(true)
+      qc.invalidateQueries({ queryKey: ['media-assets', cadFileId, 'gltf_geometry'] })
+    },
+    onError: () => toast.error('Failed to queue GLB generation'),
+  })
+
+  // Show GLB viewer
+  if (glbBlobUrl) {
+    return (
+      <div
+        className="w-full rounded-lg overflow-hidden border border-border-default bg-gray-950"
+        style={{ height: 280 }}
+      >
+        <Canvas camera={{ position: [0, 0, 2], fov: 45 }}>
+          <ambientLight intensity={1.2} />
+          <directionalLight position={[5, 5, 5]} intensity={1} />
+          <Suspense fallback={null}>
+            <GlbModel url={glbBlobUrl} />
+          </Suspense>
+          <OrbitControls makeDefault />
+        </Canvas>
+      </div>
+    )
+  }
+
+  // Loading GLB
+  if (loadingGlb) {
+    return (
+      <div
+        className="w-full rounded-lg border border-border-default bg-surface-muted flex items-center justify-center"
+        style={{ height: 280 }}
+      >
+        <div className="flex flex-col items-center gap-2 text-content-muted">
+          <Loader2 size={28} className="animate-spin" />
+          <span className="text-xs">Loading 3D model…</span>
+        </div>
+      </div>
+    )
+  }
+
+  // No GLB yet — show thumbnail + generate button
+  return (
+    <div
+      className="w-full rounded-lg border border-border-default bg-surface-muted flex flex-col items-center justify-center gap-3"
+      style={{ height: 280 }}
+    >
+      {thumbnailUrl ? (
+        <img src={thumbnailUrl} alt="CAD thumbnail" className="max-h-40 object-contain" />
+      ) : (
+        <Box size={48} className="text-content-muted" />
+      )}
+      <button
+        className="btn-secondary text-xs"
+        onClick={() => generateMut.mutate()}
+        disabled={generateMut.isPending || generating}
+        title="Export STL to GLB and load 3D viewer"
+      >
+        <RefreshCw size={12} className={generating ? 'animate-spin' : ''} />
+        {generating ? 'Generating…' : generateMut.isPending ? 'Queuing…' : 'Load 3D Model'}
+      </button>
+    </div>
+  )
+}
diff --git a/frontend/src/components/cad/ThreeDViewer.tsx b/frontend/src/components/cad/ThreeDViewer.tsx
index 8b65ec7..2fe5151 100644
--- a/frontend/src/components/cad/ThreeDViewer.tsx
+++ b/frontend/src/components/cad/ThreeDViewer.tsx
@@ -8,6 +8,7 @@ import {
   type ErrorInfo,
   type ReactNode,
 } from 'react'
+import { useQuery } from '@tanstack/react-query'
 import { Canvas, useThree, useFrame } from '@react-three/fiber'
 import { OrbitControls, useGLTF, Environment } from '@react-three/drei'
 import { toast } from 'sonner'
@@ -225,6 +226,12 @@ export default function ThreeDViewer({
   const [loadError, setLoadError] = useState<string | null>(null)
   const [modelReady, setModelReady] = useState(false)
 
+  const { data: settings3d } = useQuery({
+    queryKey: ['admin-settings'],
+    queryFn: () => api.get('/admin/settings').then(r => r.data),
+    staleTime: 60_000,
+  })
+
   // Resolve the active model URL based on mode
   const activeUrl =
     mode === 'production' && productionGltfUrl
@@ -362,7 +369,7 @@ export default function ThreeDViewer({
         {!modelReady && !loadError && <LoadingOverlay />}
 
         <Canvas
-          camera={{ position: [0, 2, 5], fov: 45 }}
+          camera={{ position: [0, 0.1, 0.3], fov: 45 }}
           gl={{ preserveDrawingBuffer: true }}
           style={{ width: '100%', height: '100%', background: '#111827' }}
         >
@@ -383,7 +390,13 @@ export default function ThreeDViewer({
             </GltfErrorBoundary>
           )}
 
-          <OrbitControls enablePan enableZoom enableRotate minDistance={0.3} maxDistance={100} />
+          <OrbitControls
+            enablePan
+            enableZoom
+            enableRotate
+            minDistance={settings3d?.viewer_min_distance ?? 0.001}
+            maxDistance={settings3d?.viewer_max_distance ?? 50}
+          />
           <Environment preset={envPreset} />
 
           {capturing && (
diff --git a/frontend/src/pages/Admin.tsx b/frontend/src/pages/Admin.tsx
index 9417b4c..07e1225 100644
--- a/frontend/src/pages/Admin.tsx
+++ b/frontend/src/pages/Admin.tsx
@@ -86,6 +86,13 @@ export default function AdminPage() {
     smtp_user: string
     smtp_password: string
     smtp_from_address: string
+    gltf_scale_factor: number
+    gltf_smooth_normals: boolean
+    viewer_max_distance: number
+    viewer_min_distance: number
+    gltf_material_quality: string
+    gltf_pbr_roughness: number
+    gltf_pbr_metallic: number
   }
 
   const { data: settings } = useQuery({
@@ -106,6 +113,9 @@ export default function AdminPage() {
   const [blenderDraft, setBlenderDraft] = useState<Partial<Settings>>({})
   const blender = { ...settings, ...blenderDraft } as Settings
 
+  const [viewerDraft, setViewerDraft] = useState<Partial<Settings>>({})
+  const viewer3d = { ...settings, ...viewerDraft } as Settings
+
   const { data: rendererStatus, refetch: refetchStatus } = useQuery({
     queryKey: ['renderer-status'],
     queryFn: async () => {
@@ -157,6 +167,14 @@ export default function AdminPage() {
     onError: (e: any) => toast.error(e.response?.data?.detail || 'Failed'),
   })
 
+  const reextractMetadataMut = useMutation({
+    mutationFn: () => api.post('/admin/settings/reextract-metadata'),
+    onSuccess: (res) => {
+      toast.success(res.data.message || 'Metadata re-extraction queued')
+    },
+    onError: (e: any) => toast.error(e.response?.data?.detail || 'Failed'),
+  })
+
   const seedWorkflowsMut = useMutation({
     mutationFn: () => api.post('/admin/settings/seed-workflows'),
     onSuccess: (res) => {
@@ -698,6 +716,18 @@ export default function AdminPage() {
                 </button>
                 <p className="text-xs text-content-muted">Generates low + high STL files for completed STEP files missing them.</p>
               </div>
+              <div className="flex flex-col gap-1">
+                <button
+                  onClick={() => reextractMetadataMut.mutate()}
+                  disabled={reextractMetadataMut.isPending}
+                  className="btn-secondary text-sm w-full justify-start"
+                  title="Re-extract OCC bounding box and sharp-edge data for all completed CAD files"
+                >
+                  <RefreshCw size={14} className={reextractMetadataMut.isPending ? 'animate-spin' : ''} />
+                  {reextractMetadataMut.isPending ? 'Queueing…' : 'Re-extract CAD Metadata'}
+                </button>
+                <p className="text-xs text-content-muted">Updates dimensions and edge data for existing files (no re-render).</p>
+              </div>
               <div className="flex flex-col gap-1">
                 <button
                   onClick={() => seedWorkflowsMut.mutate()}
@@ -961,6 +991,150 @@ export default function AdminPage() {
         />
       )}
 
+      {/* ------------------------------------------------------------------ */}
+      {/* 3D Viewer & GLB Export Settings                                     */}
+      {/* ------------------------------------------------------------------ */}
+      <div className="card">
+        <div className="p-4 border-b border-border-default">
+          <h2 className="font-semibold text-content">3D Viewer & GLB Export</h2>
+          <p className="text-sm text-content-muted mt-0.5">
+            Settings for the 3D viewer and GLB geometry export
+          </p>
+        </div>
+        <div className="p-4 space-y-4">
+          {/* Scale Factor */}
+          <div className="grid grid-cols-2 gap-4">
+            <div>
+              <label className="text-sm font-medium text-content-muted block mb-1">
+                GLB Scale Factor (mm→m)
+              </label>
+              <input
+                type="number"
+                step="0.0001"
+                min="0.0001"
+                max="1"
+                value={viewer3d.gltf_scale_factor ?? 0.001}
+                onChange={e => setViewerDraft(d => ({ ...d, gltf_scale_factor: parseFloat(e.target.value) }))}
+                className="input w-full"
+              />
+              <p className="text-xs text-content-muted mt-0.5">Default 0.001 converts mm to meters</p>
+            </div>
+            <div>
+              <label className="text-sm font-medium text-content-muted block mb-1">
+                Smooth Normals
+              </label>
+              <label className="flex items-center gap-2 mt-2 cursor-pointer">
+                <input
+                  type="checkbox"
+                  checked={viewer3d.gltf_smooth_normals ?? true}
+                  onChange={e => setViewerDraft(d => ({ ...d, gltf_smooth_normals: e.target.checked }))}
+                  className="w-4 h-4"
+                />
+                <span className="text-sm text-content">Apply Laplacian smoothing on export</span>
+              </label>
+            </div>
+          </div>
+
+          {/* Camera / Zoom Limits */}
+          <div className="grid grid-cols-2 gap-4">
+            <div>
+              <label className="text-sm font-medium text-content-muted block mb-1">
+                Max Zoom-Out Distance
+              </label>
+              <input
+                type="number"
+                step="1"
+                min="1"
+                max="10000"
+                value={viewer3d.viewer_max_distance ?? 50}
+                onChange={e => setViewerDraft(d => ({ ...d, viewer_max_distance: parseFloat(e.target.value) }))}
+                className="input w-full"
+              />
+            </div>
+            <div>
+              <label className="text-sm font-medium text-content-muted block mb-1">
+                Min Zoom-In Distance
+              </label>
+              <input
+                type="number"
+                step="0.001"
+                min="0.0001"
+                max="1"
+                value={viewer3d.viewer_min_distance ?? 0.001}
+                onChange={e => setViewerDraft(d => ({ ...d, viewer_min_distance: parseFloat(e.target.value) }))}
+                className="input w-full"
+              />
+            </div>
+          </div>
+
+          {/* PBR Material Quality */}
+          <div className="grid grid-cols-3 gap-4">
+            <div>
+              <label className="text-sm font-medium text-content-muted block mb-1">
+                GLB Material Mode
+              </label>
+              <select
+                value={viewer3d.gltf_material_quality ?? 'pbr_colors'}
+                onChange={e => setViewerDraft(d => ({ ...d, gltf_material_quality: e.target.value }))}
+                className="input w-full"
+              >
+                <option value="none">None (geometry only)</option>
+                <option value="pbr_colors">PBR Colors (from part colors)</option>
+              </select>
+            </div>
+            <div>
+              <label className="text-sm font-medium text-content-muted block mb-1">
+                PBR Roughness (0–1)
+              </label>
+              <input
+                type="number"
+                step="0.05"
+                min="0"
+                max="1"
+                value={viewer3d.gltf_pbr_roughness ?? 0.4}
+                onChange={e => setViewerDraft(d => ({ ...d, gltf_pbr_roughness: parseFloat(e.target.value) }))}
+                className="input w-full"
+              />
+            </div>
+            <div>
+              <label className="text-sm font-medium text-content-muted block mb-1">
+                PBR Metallic (0–1)
+              </label>
+              <input
+                type="number"
+                step="0.05"
+                min="0"
+                max="1"
+                value={viewer3d.gltf_pbr_metallic ?? 0.6}
+                onChange={e => setViewerDraft(d => ({ ...d, gltf_pbr_metallic: parseFloat(e.target.value) }))}
+                className="input w-full"
+              />
+            </div>
+          </div>
+
+          <div className="flex gap-2">
+            <button
+              onClick={() => {
+                updateSettingsMut.mutate(viewerDraft)
+                setViewerDraft({})
+              }}
+              disabled={Object.keys(viewerDraft).length === 0 || updateSettingsMut.isPending}
+              className="btn-primary disabled:opacity-40"
+            >
+              Save 3D Settings
+            </button>
+            {Object.keys(viewerDraft).length > 0 && (
+              <button
+                onClick={() => setViewerDraft({})}
+                className="btn-secondary"
+              >
+                Reset
+              </button>
+            )}
+          </div>
+        </div>
+      </div>
+
       {/* ------------------------------------------------------------------ */}
       {/* Material Library link                                               */}
       {/* ------------------------------------------------------------------ */}
diff --git a/frontend/src/pages/CadPreview.tsx b/frontend/src/pages/CadPreview.tsx
index e771b77..3746522 100644
--- a/frontend/src/pages/CadPreview.tsx
+++ b/frontend/src/pages/CadPreview.tsx
@@ -21,7 +21,7 @@ export default function CadPreviewPage() {
   // Poll every 3s while generating so it appears automatically
   const { data: gltfAssets, isLoading: gltfLoading } = useQuery({
     queryKey: ['media-assets', id, 'gltf_geometry'],
-    queryFn: () => getMediaAssets({ cad_file_id: id!, asset_type: 'gltf_geometry' }),
+    queryFn: () => getMediaAssets({ cad_file_id: id!, asset_types: ['gltf_geometry'] }),
     enabled: !!id,
     staleTime: 5_000,
     refetchInterval: generating ? 3_000 : false,
@@ -30,7 +30,7 @@ export default function CadPreviewPage() {
   // Load production GLB if available
   const { data: productionAssets } = useQuery({
     queryKey: ['media-assets', id, 'gltf_production'],
-    queryFn: () => getMediaAssets({ cad_file_id: id!, asset_type: 'gltf_production' }),
+    queryFn: () => getMediaAssets({ cad_file_id: id!, asset_types: ['gltf_production'] }),
     enabled: !!id,
     staleTime: 30_000,
   })
@@ -38,7 +38,7 @@ export default function CadPreviewPage() {
   // Load blend assets for download
   const { data: blendAssets } = useQuery({
     queryKey: ['media-assets', id, 'blend_production'],
-    queryFn: () => getMediaAssets({ cad_file_id: id!, asset_type: 'blend_production' }),
+    queryFn: () => getMediaAssets({ cad_file_id: id!, asset_types: ['blend_production'] }),
     enabled: !!id,
     staleTime: 30_000,
   })
diff --git a/frontend/src/pages/MediaBrowser.tsx b/frontend/src/pages/MediaBrowser.tsx
index 3ac00e8..c082a35 100644
--- a/frontend/src/pages/MediaBrowser.tsx
+++ b/frontend/src/pages/MediaBrowser.tsx
@@ -1,14 +1,54 @@
-import { useState } from 'react'
+import { useState, useEffect } from 'react'
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import {
   LayoutGrid, LayoutList, Download, Archive, Image, Film, Box, FileCode2, Layers,
-  ChevronLeft, ChevronRight, Search, ChevronDown, ChevronUp,
+  ChevronLeft, ChevronRight, Search, ChevronDown, ChevronUp, Trash2, ArrowUpDown,
+  Loader2,
 } from 'lucide-react'
 import { toast } from 'sonner'
 import {
-  getMediaAssets, zipDownloadAssets, archiveMediaAsset,
+  getMediaAssets, zipDownloadAssets, archiveMediaAsset, deleteMediaAssetPermanent,
 } from '../api/media'
 import type { MediaAsset, MediaAssetType, MediaFilter } from '../api/media'
+import { useAuthStore } from '../store/auth'
+
+// ── useAuthBlob ───────────────────────────────────────────────────────────────
+
+function useAuthBlob(url: string | null | undefined, enabled: boolean): string | null {
+  const token = useAuthStore(s => s.token)
+  const [blobUrl, setBlobUrl] = useState<string | null>(null)
+
+  useEffect(() => {
+    if (!enabled || !url || !token) {
+      setBlobUrl(null)
+      return
+    }
+
+    let objectUrl: string | null = null
+    let cancelled = false
+
+    fetch(url, { headers: { Authorization: `Bearer ${token}` } })
+      .then(res => {
+        if (!res.ok) throw new Error(`HTTP ${res.status}`)
+        return res.blob()
+      })
+      .then(blob => {
+        if (cancelled) return
+        objectUrl = URL.createObjectURL(blob)
+        setBlobUrl(objectUrl)
+      })
+      .catch(() => {
+        if (!cancelled) setBlobUrl(null)
+      })
+
+    return () => {
+      cancelled = true
+      if (objectUrl) URL.revokeObjectURL(objectUrl)
+    }
+  }, [url, token, enabled])
+
+  return blobUrl
+}
 
 // ── Helpers ───────────────────────────────────────────────────────────────────
 
@@ -35,16 +75,18 @@ const TYPE_COLORS: Record<MediaAssetType, string> = {
 const PRIMARY_TYPES: MediaAssetType[] = ['still', 'turntable', 'thumbnail']
 const ADVANCED_TYPES: MediaAssetType[] = ['gltf_geometry', 'gltf_production', 'blend_production', 'stl_low', 'stl_high']
 const ALL_TYPES: MediaAssetType[] = [...PRIMARY_TYPES, ...ADVANCED_TYPES]
-const DEFAULT_TYPES: Set<MediaAssetType> = new Set(['still', 'turntable'])
+const DEFAULT_TYPES: Set<MediaAssetType> = new Set(['thumbnail', 'still', 'turntable'])
 
-const isImageAsset = (type: MediaAssetType) => type === 'thumbnail' || type === 'still'
-const isVideoAsset = (type: MediaAssetType) => type === 'turntable'
+const isImageAsset = (type: MediaAssetType, mime?: string | null) =>
+  type === 'thumbnail' || type === 'still' || (mime?.startsWith('image/') ?? false)
+const isVideoAsset = (type: MediaAssetType, mime?: string | null) =>
+  type === 'turntable' && (mime?.startsWith('video/') ?? true)
 
 // ── TypeIcon ─────────────────────────────────────────────────────────────────
 
-function TypeIcon({ type }: { type: MediaAssetType }) {
-  if (isImageAsset(type)) return <Image size={32} className="text-gray-400" />
-  if (isVideoAsset(type)) return <Film size={32} className="text-gray-400" />
+function TypeIcon({ type, mime }: { type: MediaAssetType; mime?: string | null }) {
+  if (isImageAsset(type, mime)) return <Image size={32} className="text-gray-400" />
+  if (isVideoAsset(type, mime)) return <Film size={32} className="text-gray-400" />
   if (type === 'stl_low' || type === 'stl_high') return <Box size={32} className="text-gray-400" />
   if (type === 'gltf_geometry' || type === 'gltf_production') return <FileCode2 size={32} className="text-gray-400" />
   return <Layers size={32} className="text-gray-400" />
@@ -61,10 +103,17 @@ function AssetCard({
   selected: boolean
   onToggle: () => void
 }) {
+  const isImg = isImageAsset(asset.asset_type, asset.mime_type)
+  const authImgUrl = useAuthBlob(asset.download_url, isImg)
+
+  const showImage = isImg && !!authImgUrl
+  const showImgLoading = isImg && !authImgUrl && !!asset.download_url
+  const showThumb = !isImg && !isVideoAsset(asset.asset_type, asset.mime_type) && asset.thumbnail_url
+
   return (
     <div
       className={`relative rounded-lg border-2 overflow-hidden cursor-pointer transition-colors ${
-        selected ? 'border-blue-500' : 'border-gray-200 hover:border-gray-300'
+        selected ? 'border-blue-500' : 'border-border-default hover:border-accent'
       }`}
       onClick={onToggle}
     >
@@ -75,31 +124,37 @@ function AssetCard({
         onClick={e => e.stopPropagation()}
         className="absolute top-2 left-2 z-10 w-4 h-4 cursor-pointer"
       />
-      {isImageAsset(asset.asset_type) && asset.download_url ? (
+      {showImage ? (
         <img
-          src={asset.download_url}
+          src={authImgUrl!}
           alt={asset.asset_type}
-          className="w-full h-40 object-cover bg-gray-50"
+          className="w-full h-44 object-contain p-2"
+          style={{ backgroundColor: 'var(--color-bg-surface-alt)' }}
         />
-      ) : isVideoAsset(asset.asset_type) && asset.download_url ? (
+      ) : showImgLoading ? (
+        <div className="w-full h-44 flex items-center justify-center" style={{ backgroundColor: 'var(--color-bg-surface-alt)' }}>
+          <Loader2 size={28} className="text-gray-400 animate-spin" />
+        </div>
+      ) : isVideoAsset(asset.asset_type, asset.mime_type) && asset.download_url ? (
         <video
           src={asset.download_url}
           poster={asset.thumbnail_url ?? undefined}
-          className="w-full h-40 object-cover bg-gray-900"
+          className="w-full h-44 object-cover bg-gray-900"
           loop
           muted
           onMouseEnter={e => (e.currentTarget as HTMLVideoElement).play()}
           onMouseLeave={e => { (e.currentTarget as HTMLVideoElement).pause(); (e.currentTarget as HTMLVideoElement).currentTime = 0 }}
         />
-      ) : asset.thumbnail_url ? (
+      ) : showThumb ? (
         <img
-          src={asset.thumbnail_url}
+          src={asset.thumbnail_url!}
           alt={asset.asset_type}
-          className="w-full h-40 object-cover bg-gray-50 opacity-80"
+          className="w-full h-44 object-contain p-2 opacity-80"
+          style={{ backgroundColor: 'var(--color-bg-surface-alt)' }}
         />
       ) : (
-        <div className="w-full h-40 flex items-center justify-center bg-gray-50">
-          <TypeIcon type={asset.asset_type} />
+        <div className="w-full h-44 flex items-center justify-center" style={{ backgroundColor: 'var(--color-bg-surface-alt)' }}>
+          <TypeIcon type={asset.asset_type} mime={asset.mime_type} />
         </div>
       )}
       <div className="p-2 space-y-1">
@@ -189,6 +244,8 @@ export default function MediaBrowserPage() {
   const [productIdInput, setProductIdInput] = useState('')
   const [page, setPage] = useState(0)
   const [selectedIds, setSelectedIds] = useState<Set<string>>(new Set())
+  const [sortBy, setSortBy] = useState('created_at')
+  const [sortDir, setSortDir] = useState<'asc' | 'desc'>('desc')
 
   const toggleType = (t: MediaAssetType) => {
     setActiveTypes(prev => {
@@ -204,6 +261,8 @@ export default function MediaBrowserPage() {
     product_id: productIdInput.trim() || undefined,
     skip: page * PAGE_SIZE,
     limit: PAGE_SIZE,
+    sort_by: sortBy,
+    sort_dir: sortDir,
   }
 
   const { data: assets = [], isLoading } = useQuery({
@@ -220,6 +279,14 @@ export default function MediaBrowserPage() {
     onError: () => toast.error('Failed to archive asset'),
   })
 
+  const deleteMutation = useMutation({
+    mutationFn: deleteMediaAssetPermanent,
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: ['media'] })
+    },
+    onError: () => toast.error('Failed to delete asset'),
+  })
+
   const toggleSelect = (id: string) => {
     setSelectedIds(prev => {
       const next = new Set(prev)
@@ -252,6 +319,19 @@ export default function MediaBrowserPage() {
     setSelectedIds(new Set())
   }
 
+  const handleDeleteSelected = async () => {
+    if (!confirm(`Permanently delete ${selectedIds.size} asset(s)? This cannot be undone.`)) return
+    let deleted = 0
+    for (const id of selectedIds) {
+      try {
+        await deleteMutation.mutateAsync(id)
+        deleted++
+      } catch { /* already toasted per item */ }
+    }
+    setSelectedIds(new Set())
+    toast.success(`${deleted} asset(s) permanently deleted`)
+  }
+
   const handleDownload = (asset: MediaAsset) => {
     if (asset.download_url) {
       window.open(asset.download_url, '_blank')
@@ -269,6 +349,27 @@ export default function MediaBrowserPage() {
           </p>
         </div>
         <div className="flex items-center gap-2">
+          {/* Sort dropdown */}
+          <div className="flex items-center gap-1 border border-border-default rounded-md px-2 py-1">
+            <ArrowUpDown size={14} className="text-content-muted shrink-0" />
+            <select
+              value={`${sortBy}:${sortDir}`}
+              onChange={e => {
+                const [by, dir] = e.target.value.split(':')
+                setSortBy(by)
+                setSortDir(dir as 'asc' | 'desc')
+                setPage(0)
+              }}
+              className="text-xs text-content bg-transparent focus:outline-none cursor-pointer"
+            >
+              <option value="created_at:desc">Newest first</option>
+              <option value="created_at:asc">Oldest first</option>
+              <option value="storage_key:asc">Name A–Z</option>
+              <option value="storage_key:desc">Name Z–A</option>
+              <option value="file_size_bytes:desc">Largest first</option>
+              <option value="file_size_bytes:asc">Smallest first</option>
+            </select>
+          </div>
           <button
             onClick={() => setView('grid')}
             className={`p-2 rounded-md transition-colors ${
@@ -311,7 +412,7 @@ export default function MediaBrowserPage() {
               className={`px-3 py-1 text-xs font-medium rounded-full border transition-colors ${
                 activeTypes.has(t)
                   ? `${TYPE_COLORS[t]} border-transparent`
-                  : 'bg-gray-50 text-gray-400 border-gray-200 hover:border-gray-300'
+                  : 'bg-surface-alt text-content-muted border-border-default hover:bg-surface-hover'
               }`}
             >
               {t}
@@ -337,7 +438,7 @@ export default function MediaBrowserPage() {
                 className={`px-3 py-1 text-xs font-medium rounded-full border transition-colors ${
                   activeTypes.has(t)
                     ? `${TYPE_COLORS[t]} border-transparent`
-                    : 'bg-gray-50 text-gray-400 border-gray-200 hover:border-gray-300'
+                    : 'bg-surface-alt text-content-muted border-border-default hover:bg-surface-hover'
                 }`}
               >
                 {t}
@@ -439,11 +540,18 @@ export default function MediaBrowserPage() {
           </button>
           <button
             onClick={handleArchiveSelected}
-            className="flex items-center gap-2 text-sm bg-red-600 hover:bg-red-700 px-4 py-2 rounded-lg transition-colors"
+            className="flex items-center gap-2 text-sm bg-amber-600 hover:bg-amber-700 px-4 py-2 rounded-lg transition-colors"
           >
             <Archive size={16} />
             Archive
           </button>
+          <button
+            onClick={handleDeleteSelected}
+            className="flex items-center gap-2 text-sm bg-red-600 hover:bg-red-700 px-4 py-2 rounded-lg transition-colors"
+          >
+            <Trash2 size={16} />
+            Delete
+          </button>
           <button
             onClick={() => setSelectedIds(new Set())}
             className="text-gray-400 hover:text-white transition-colors text-lg leading-none"
diff --git a/frontend/src/pages/ProductDetail.tsx b/frontend/src/pages/ProductDetail.tsx
index af8c181..dad6975 100644
--- a/frontend/src/pages/ProductDetail.tsx
+++ b/frontend/src/pages/ProductDetail.tsx
@@ -18,7 +18,8 @@ import { listMaterials } from '../api/materials'
 import MaterialInput from '../components/shared/MaterialInput'
 import MaterialWizard from '../components/MaterialWizard'
 import { useAuthStore } from '../store/auth'
-import { downloadStl, generateStl, generateGltfGeometry } from '../api/cad'
+import { downloadStl, generateStl, generateGltfGeometry, exportGltfColored } from '../api/cad'
+import InlineCadViewer from '../components/cad/InlineCadViewer'
 
 function CadStatusBadge({ status }: { status: string | null }) {
   if (!status) return (
@@ -289,6 +290,11 @@ export default function ProductDetailPage() {
     onError: (e: any) => toast.error(e.response?.data?.detail || 'Failed to delete'),
   })
 
+  const exportGltfColoredMut = useMutation({
+    mutationFn: () => exportGltfColored(product?.cad_file_id!),
+    onError: () => toast.error('GLB export failed'),
+  })
+
   const [editPositionDraft, setEditPositionDraft] = useState<Partial<RenderPosition>>({})
 
   const POSITION_PRESETS = [
@@ -414,6 +420,16 @@ export default function ProductDetailPage() {
               <p className="text-sm text-content">{product.notes || <span className="text-content-muted">—</span>}</p>
             )}
           </div>
+          {product.cad_mesh_attributes?.dimensions_mm && (
+            <div className="col-span-2 mt-1 pt-2 border-t border-border-light">
+              <label className="block text-xs text-content-muted mb-0.5 flex items-center gap-1">
+                <Ruler size={11} /> Dimensions <span className="text-content-muted/60 font-normal">(from CAD)</span>
+              </label>
+              <p className="text-sm text-content font-mono">
+                {product.cad_mesh_attributes.dimensions_mm.x.toFixed(1)} × {product.cad_mesh_attributes.dimensions_mm.y.toFixed(1)} × {product.cad_mesh_attributes.dimensions_mm.z.toFixed(1)} mm
+              </p>
+            </div>
+          )}
         </div>
 
         {editMode && isPrivileged && (
@@ -510,60 +526,49 @@ export default function ProductDetailPage() {
 
         {product.cad_file_id ? (
           <div className="space-y-3">
-            {/* Thumbnail */}
-            <div className="flex gap-4">
-              <div className="w-32 h-32 bg-surface-muted rounded border flex items-center justify-center shrink-0 overflow-hidden">
-                {(product.render_image_url || product.thumbnail_url) ? (
-                  <img
-                    src={product.render_image_url || product.thumbnail_url!}
-                    alt="thumbnail"
-                    className="w-full h-full object-contain"
-                  />
-                ) : (
-                  <Box size={36} className="text-content-muted" />
-                )}
-              </div>
-              <div className="flex flex-col gap-2 justify-end">
-                {isPrivileged && (
-                  <>
-                    <div {...getRootProps()} className="cursor-pointer">
-                      <input {...getInputProps()} />
-                      <button className="btn-secondary text-xs" disabled={cadUploadMut.isPending}>
-                        <Upload size={12} />
-                        {cadUploadMut.isPending ? 'Uploading…' : 'Re-upload STEP'}
-                      </button>
-                    </div>
-                    <button
-                      className="btn-secondary text-xs"
-                      onClick={() => regenerateMut.mutate()}
-                      disabled={regenerateMut.isPending}
-                      title="Re-render the thumbnail using the current part materials and the active thumbnail renderer — keeps the existing STEP parse data"
-                    >
-                      <RotateCcw size={12} />
-                      {regenerateMut.isPending ? 'Queuing…' : 'Regenerate thumbnail'}
+            {/* Inline 3D Viewer */}
+            <InlineCadViewer
+              cadFileId={product.cad_file_id}
+              thumbnailUrl={product.render_image_url || product.thumbnail_url}
+            />
+
+            {/* Action buttons */}
+            <div className="flex flex-wrap gap-2">
+              {isPrivileged && (
+                <>
+                  <div {...getRootProps()} className="cursor-pointer">
+                    <input {...getInputProps()} />
+                    <button className="btn-secondary text-xs" disabled={cadUploadMut.isPending}>
+                      <Upload size={12} />
+                      {cadUploadMut.isPending ? 'Uploading…' : 'Re-upload STEP'}
                     </button>
-                    <button
-                      className="btn-secondary text-xs"
-                      onClick={() => reprocessMut.mutate()}
-                      disabled={reprocessMut.isPending}
-                      title="Re-run full STEP processing: re-parse part names, regenerate thumbnail and glTF. Use this after re-uploading a STEP file."
-                    >
-                      <RotateCcw size={12} />
-                      {reprocessMut.isPending ? 'Queuing…' : 'Re-process STEP'}
-                    </button>
-                  </>
-                )}
-                {product.cad_file_id && (
+                  </div>
+                  <button
+                    className="btn-secondary text-xs"
+                    onClick={() => regenerateMut.mutate()}
+                    disabled={regenerateMut.isPending}
+                    title="Re-render the thumbnail using the current part materials and the active thumbnail renderer — keeps the existing STEP parse data"
+                  >
+                    <RotateCcw size={12} />
+                    {regenerateMut.isPending ? 'Queuing…' : 'Regenerate thumbnail'}
+                  </button>
+                  <button
+                    className="btn-secondary text-xs"
+                    onClick={() => reprocessMut.mutate()}
+                    disabled={reprocessMut.isPending}
+                    title="Re-run full STEP processing: re-parse part names, regenerate thumbnail and glTF. Use this after re-uploading a STEP file."
+                  >
+                    <RotateCcw size={12} />
+                    {reprocessMut.isPending ? 'Queuing…' : 'Re-process STEP'}
+                  </button>
                   <button
                     className="btn-secondary text-xs"
                     onClick={() => navigate(`/cad/${product.cad_file_id}`)}
-                    title="Open interactive 3D viewer"
+                    title="Open interactive 3D viewer in full screen"
                   >
                     <Cuboid size={12} />
-                    View 3D
+                    View Full Screen
                   </button>
-                )}
-                {product.cad_file_id && isPrivileged && (
                   <button
                     className="btn-secondary text-xs"
                     onClick={() =>
@@ -576,10 +581,19 @@ export default function ProductDetailPage() {
                     <Download size={12} />
                     Generate GLB
                   </button>
-                )}
-                {product.cad_file_id && isPrivileged && (
-                  <div className="flex flex-col gap-1 pt-1 border-t border-border-light">
-                    <p className="text-xs text-content-muted font-medium">STL</p>
+                  {product?.processing_status === 'completed' && (
+                    <button
+                      onClick={() => exportGltfColoredMut.mutate()}
+                      disabled={exportGltfColoredMut.isPending}
+                      className="btn-secondary flex items-center gap-2 disabled:opacity-40 text-xs"
+                      title="Download GLB with PBR colors from material assignments"
+                    >
+                      <Download size={12} />
+                      {exportGltfColoredMut.isPending ? 'Exporting…' : 'GLB + Colors'}
+                    </button>
+                  )}
+                  <div className="flex items-center gap-1 pl-1 border-l border-border-light">
+                    <p className="text-xs text-content-muted font-medium">STL:</p>
                     {(['low', 'high'] as const).map((q) =>
                       product.stl_cached.includes(q) ? (
                         <button
@@ -588,7 +602,7 @@ export default function ProductDetailPage() {
                           onClick={() => downloadStl(product.cad_file_id!, q, product.name_cad_modell || product.name || undefined)}
                           title={q === 'low' ? 'Coarse mesh, tolerance 0.3 mm' : 'Fine mesh, tolerance 0.01 mm'}
                         >
-                          <Download size={12} /> {q === 'low' ? 'Low' : 'High'} quality
+                          <Download size={12} /> {q === 'low' ? 'Low' : 'High'}
                         </button>
                       ) : (
                         <button
@@ -597,18 +611,32 @@ export default function ProductDetailPage() {
                           onClick={() => generateStl(product.cad_file_id!, q).then(() => toast.info(`STL generation queued (${q} quality)`)).catch(() => toast.error('Failed to queue STL generation'))}
                           title={`${q === 'low' ? 'Low' : 'High'}-quality STL not cached — click to generate`}
                         >
-                          <RefreshCw size={12} /> Generate {q === 'low' ? 'Low' : 'High'} quality
+                          <RefreshCw size={12} /> Gen {q === 'low' ? 'Low' : 'High'}
                         </button>
                       )
                     )}
                   </div>
-                )}
-              </div>
+                </>
+              )}
+              {!isPrivileged && product.cad_file_id && (
+                <button
+                  className="btn-secondary text-xs"
+                  onClick={() => navigate(`/cad/${product.cad_file_id}`)}
+                  title="Open interactive 3D viewer in full screen"
+                >
+                  <Cuboid size={12} />
+                  View Full Screen
+                </button>
+              )}
             </div>
 
             {/* Mesh attributes */}
-            {product.cad_file?.mesh_attributes && Object.keys(product.cad_file.mesh_attributes).length > 0 && (() => {
-              const mesh_attrs = product.cad_file!.mesh_attributes!
+            {(() => {
+              // Prefer cad_mesh_attributes (reliably populated by API) over cad_file.mesh_attributes
+              const mesh_attrs: Record<string, unknown> = (product.cad_mesh_attributes ?? product.cad_file?.mesh_attributes) as Record<string, unknown> ?? {}
+              if (Object.keys(mesh_attrs).length === 0) return null
+              const dims = mesh_attrs.dimensions_mm as { x: number; y: number; z: number } | undefined
+              const bbox = mesh_attrs.bbox as { x?: number; y?: number; z?: number } | undefined
               return (
                 <div className="mt-3 p-3 rounded-md border border-border-default bg-surface-alt">
                   <p className="text-xs font-semibold text-content-muted mb-2 flex items-center gap-1">
@@ -616,28 +644,32 @@ export default function ProductDetailPage() {
                     Geometry
                   </p>
                   <div className="grid grid-cols-2 gap-x-4 gap-y-1 text-xs">
-                    {mesh_attrs.volume_mm3 != null && (
+                    {dims != null && (
+                      <>
+                        <span className="text-content-muted">Dimensions</span>
+                        <span>{dims.x.toFixed(1)} × {dims.y.toFixed(1)} × {dims.z.toFixed(1)} mm</span>
+                      </>
+                    )}
+                    {dims == null && bbox != null && (
+                      <>
+                        <span className="text-content-muted">BBox</span>
+                        <span>
+                          {bbox.x?.toFixed(1)} × {bbox.y?.toFixed(1)} × {bbox.z?.toFixed(1)} mm
+                        </span>
+                      </>
+                    )}
+                    {(mesh_attrs.volume_mm3 as number | undefined) != null && (
                       <>
                         <span className="text-content-muted">Volume</span>
                         <span>{((mesh_attrs.volume_mm3 as number) / 1000).toFixed(2)} cm³</span>
                       </>
                     )}
-                    {mesh_attrs.surface_area_mm2 != null && (
+                    {(mesh_attrs.surface_area_mm2 as number | undefined) != null && (
                       <>
                         <span className="text-content-muted">Surface</span>
                         <span>{((mesh_attrs.surface_area_mm2 as number) / 100).toFixed(1)} cm²</span>
                       </>
                     )}
-                    {mesh_attrs.bbox != null && (
-                      <>
-                        <span className="text-content-muted">BBox</span>
-                        <span>
-                          {(mesh_attrs.bbox as { x?: number; y?: number; z?: number }).x?.toFixed(1)} &times;{' '}
-                          {(mesh_attrs.bbox as { x?: number; y?: number; z?: number }).y?.toFixed(1)} &times;{' '}
-                          {(mesh_attrs.bbox as { x?: number; y?: number; z?: number }).z?.toFixed(1)} mm
-                        </span>
-                      </>
-                    )}
                     {mesh_attrs.suggested_smooth_angle !== undefined && (
                       <>
                         <span className="text-content-muted">Sharp angle</span>
diff --git a/plan.md b/plan.md
index 6d79f78..35711fa 100644
--- a/plan.md
+++ b/plan.md
@@ -1,114 +1,81 @@
-# Plan: Layout Hamburger + Media Browser Fixes + Retroactive Import
+# Plan: 4 Bug Fixes — Media Thumbnails, Product Dimensions, Inline 3D Viewer, GLB Export
 
-## Kontext
+## Root Cause Analysis
 
-Vier unabhängige Bereiche:
-1. **Layout**: Sidebar hat kein Mobile-Support, kein Hamburger-Menü → Content füllt nicht volle Breite auf kleinen Screens
-2. **Media Browser Previews**: glTF-Assets zeigen nur Icon-Placeholder; CadFile-Thumbnails wären als Preview nutzbar
-3. **Media Browser Filter-Defaults**: Aktuell kein Default-Filter → alle Types (inkl. GLB/STL) sichtbar; gewünscht: Default nur still + turntable
-4. **Retroactive Import**: Bestehende `cad_files.thumbnail_path` und `order_lines.result_path` sind nicht als `media_assets` erfasst
+### Bug A — Missing Thumbnails in Media Library
+`<img src="/api/media/{id}/download">` fails silently: the download endpoint requires JWT auth, but `<img>` tags don't send auth headers → 401 → `imgError=true` → gray icon.
+For `thumbnail` type assets: fallback works via `get_thumbnail_url()` → `/api/cad/{cad_file_id}/thumbnail` (no-auth endpoint). For `still` type: no cad_file_id/product_id → no fallback → gray icon shown.
+
+### Bug B — No Dimensions in "Product Details" Card
+The `cad_mesh_attributes.dimensions_mm` block exists in the CAD File section (right sidebar), NOT in the "Product Details" card. User wants it in Product Details.
+
+### Bug C — No Embedded 3D Viewer
+"View 3D" navigates to `/cad/:id` (full page). User wants an inline viewer in the product page CAD card that auto-loads when a `gltf_geometry` asset exists.
+
+### Bug D — GLB + Colors Error
+`trimesh` is in `pyproject.toml` but the backend container was not rebuilt → `ModuleNotFoundError: No module named 'trimesh'`. Needs rebuild.
 
 ---
 
 ## Betroffene Dateien
 
-| Datei | Änderung |
-|-------|----------|
-| `frontend/src/components/layout/Layout.tsx` | Hamburger-Menü + Mobile-Overlay |
-| `frontend/src/pages/MediaBrowser.tsx` | Filter-Chips + Previews + Default-Filter |
-| `frontend/src/api/media.ts` | `asset_types[]` statt `asset_type` + `thumbnail_url` Feld |
-| `backend/app/domains/media/schemas.py` | `thumbnail_url: str | None` Feld |
-| `backend/app/domains/media/router.py` | `asset_types` Multi-Query-Param + thumbnail_url befüllen |
-| `backend/app/domains/media/service.py` | `get_thumbnail_url(asset)` Helper |
-| `backend/app/api/routers/admin.py` | `POST /api/admin/import-media-assets` Endpoint |
-| `frontend/src/pages/Admin.tsx` | Button "Import Existing Media" |
+| File | Change | Bug |
+|------|--------|-----|
+| `frontend/src/pages/MediaBrowser.tsx` | `useAuthBlob` hook + use in AssetCard | A |
+| `backend/app/domains/rendering/tasks.py` | `publish_asset` populates product_id + cad_file_id | A |
+| `frontend/src/pages/ProductDetail.tsx` | Add dimensions to Product Details card + inline viewer | B, C |
+| `frontend/src/components/cad/InlineCadViewer.tsx` | New compact 3D viewer component | C |
+| `backend/` (docker rebuild) | Rebuild to install trimesh | D |
 
 ---
 
 ## Tasks (in Reihenfolge)
 
-### Task 1: Layout — Hamburger-Menü + Mobile Sidebar
-- **Datei**: `frontend/src/components/layout/Layout.tsx`
+### Task A1: Backend — publish_asset populates product_id + cad_file_id
+- **Datei**: `backend/app/domains/rendering/tasks.py`
+- **Was**: In `publish_asset`, after loading the OrderLine, also load `line.product_id` and the product's `cad_file_id`. Set these on the new MediaAsset. This enables the `_resolve_thumbnails_bulk` fallback and `get_thumbnail_url()` for still assets.
+- **Akzeptanzkriterium**: New still assets have product_id and cad_file_id set in DB.
+
+### Task A2: Frontend — useAuthBlob hook in MediaBrowser
+- **Datei**: `frontend/src/pages/MediaBrowser.tsx`
+- **Was**: Add `useAuthBlob(url)` hook that fetches the URL with Authorization header and returns a blob URL. Use it in `AssetCard` instead of `asset.download_url` for image rendering. Revoke blob URL on unmount.
+- **Akzeptanzkriterium**: Still images visible in media library grid.
+
+### Task B: Frontend — Dimensions in Product Details card
+- **Datei**: `frontend/src/pages/ProductDetail.tsx`
+- **Was**: In the "Product Details" card (around line 409-433), after the Notes field, add a read-only "Dimensions" row if `product.cad_mesh_attributes?.dimensions_mm` exists. Format: "X × Y × Z mm" with a Ruler icon and small "from CAD" label.
+- **Akzeptanzkriterium**: Dimensions visible in Product Details card when mesh_attributes populated.
+
+### Task C: Frontend — Inline 3D Viewer in CAD card
+- **Datei**: `frontend/src/components/cad/InlineCadViewer.tsx` (new), `frontend/src/pages/ProductDetail.tsx`
 - **Was**:
-  - State `sidebarOpen: boolean` (default: `false` auf mobile, `true` auf desktop via window.innerWidth)
-  - Hamburger-Button (`Menu`-Icon aus lucide) in einem mobilen Header-Bar (nur sichtbar `< md`, also `md:hidden`)
-  - Sidebar: auf mobile `fixed left-0 top-0 h-full z-40 transform transition-transform`, bei `sidebarOpen`: `translate-x-0`, sonst `-translate-x-full`; auf Desktop immer sichtbar (`md:relative md:translate-x-0`)
-  - Overlay-Backdrop: halbtransparentes `div` hinter Sidebar, nur auf mobile sichtbar wenn open, click schließt Sidebar
-  - Close-Button (X) oben in Sidebar auf mobile
-  - Content-Bereich: `flex-1 overflow-auto min-w-0` damit er immer volle restliche Breite nutzt
-- **Akzeptanzkriterium**: Auf <768px Hamburger sichtbar, Sidebar aus-/einblendbar; auf ≥768px Sidebar immer sichtbar
+  1. Create `InlineCadViewer` component that:
+     - Accepts `cadFileId: string`
+     - Queries `getMediaAssets({ cad_file_id, asset_types: ['gltf_geometry'] })`
+     - If asset found: fetches GLB with auth (axios → arraybuffer → blob URL) → renders Three.js canvas (OrbitControls, auto-fit camera)
+     - While loading: shows spinner
+     - If no asset: shows "Generate GLB" button + thumbnail fallback
+  2. In ProductDetail: replace the 128×128 thumbnail box with `InlineCadViewer` (make it ~300px tall)
+     - Move thumbnail fallback inside InlineCadViewer
+     - Keep "View 3D" as "View Full Screen" link below viewer
+     - Remove standalone "View 3D" button (or keep as secondary link)
+- **Akzeptanzkriterium**: Inline 3D model visible in product page without clicking "View 3D".
 
-### Task 2: Backend — `asset_types[]` Multi-Filter + `thumbnail_url`
-- **Datei**: `backend/app/domains/media/router.py`, `backend/app/domains/media/schemas.py`, `backend/app/domains/media/service.py`
-- **Was**:
-  - `list_assets` Endpoint: Zusätzlichen Query-Param `asset_types: list[MediaAssetType] = Query(default=[])` hinzufügen
-  - Filter-Logik: wenn `asset_types` nicht leer → `WHERE asset_type IN (asset_types)`; sonst wenn `asset_type` gesetzt → wie bisher
-  - `MediaAssetOut`: neues Feld `thumbnail_url: str | None = None`
-  - `service.py`: neue Funktion `get_thumbnail_url(asset) -> str | None` — gibt `/api/cad/{cad_file_id}/thumbnail` zurück wenn `cad_file_id` gesetzt (unabhängig von asset_type)
-  - In `list_assets` und `get_asset`: `a.thumbnail_url = service.get_thumbnail_url(a)` setzen (analog zu `download_url`)
-- **Akzeptanzkriterium**: `GET /api/media/?asset_types=still&asset_types=turntable` gibt nur still+turntable zurück; jedes Asset mit `cad_file_id` hat `thumbnail_url` gesetzt
-
-### Task 3: Frontend — Media Browser Filter-Chips + Previews
-- **Datei**: `frontend/src/pages/MediaBrowser.tsx`, `frontend/src/api/media.ts`
-- **Was**:
-  - `api/media.ts`: `MediaFilter.asset_types?: MediaAssetType[]` (statt `asset_type`); `getMediaAssets` sendet `asset_types` als repeated params; `MediaAsset` bekommt `thumbnail_url: string | null`
-  - `MediaBrowser.tsx`:
-    - State: `activeTypes: Set<MediaAssetType>` — Default: `new Set(['still', 'turntable'])`
-    - Filter-UI: Chip-Grid mit allen Types; `still`/`turntable`/`thumbnail` in der Hauptreihe; `gltf_geometry`/`gltf_production`/`blend_production`/`stl_low`/`stl_high` hinter "Advanced" Toggle (collapsed by default)
-    - Chip aktiv = farbiger Hintergrund entsprechend `TYPE_COLORS`; inaktiv = grau
-    - Chip-Klick toggled den Type aus `activeTypes`
-    - `getMediaAssets({ asset_types: [...activeTypes], ... })`
-    - `AssetCard`: wenn `isImageAsset(type)` → `download_url`; wenn `thumbnail_url` vorhanden → `thumbnail_url` als Preview; sonst Icon
-    - Video-Assets (`turntable`): Video-Poster via `thumbnail_url` (falls vorhanden) mit `<video>`-Tag anzeigen oder Bild
-- **Akzeptanzkriterium**: Default zeigt nur still+turntable; Chip-Klick filtert korrekt; GLB-Assets zeigen CadFile-Thumbnail
-
-### Task 4: Backend — Retroactive MediaAsset Import Endpoint
-- **Datei**: `backend/app/api/routers/admin.py`
-- **Was**: Neuer Endpoint `POST /api/admin/import-media-assets` (require_admin):
-  ```python
-  # 1. CadFiles mit thumbnail_path + status='completed'
-  SELECT id, thumbnail_path FROM cad_files
-  WHERE thumbnail_path IS NOT NULL AND status = 'completed'
-
-  # 2. OrderLines mit result_path + render_status='completed' + output_type
-  SELECT ol.id, ol.result_path, ol.product_id, ol.output_type_id, ot.is_animation
-  FROM order_lines ol LEFT JOIN output_types ot ON ot.id = ol.output_type_id
-  WHERE ol.result_path IS NOT NULL AND ol.render_status = 'completed'
-  ```
-  - De-dup: `SELECT id FROM media_assets WHERE storage_key = ?` vor jedem Insert
-  - CadFile → `MediaAsset(asset_type='thumbnail', cad_file_id=..., storage_key=thumbnail_path, mime_type='image/jpeg')`
-  - OrderLine → `MediaAsset(asset_type='turntable' if is_animation else 'still', order_line_id=..., storage_key=result_path)`
-  - Returns: `{"created": N, "skipped": N}`
-- **Akzeptanzkriterium**: Nach Aufruf erscheinen alle bestehenden Thumbnails + Renders im Media Browser
-
-### Task 5: Frontend — Admin "Import Existing Media" Button
-- **Datei**: `frontend/src/pages/Admin.tsx`
-- **Was**: Im Admin-Panel (Media/Settings-Bereich) neuer Button "Import Existing Media" → `POST /api/admin/import-media-assets` → Toast mit `{created, skipped}` Ergebnis
-- **Abhängigkeiten**: Task 4
-- **Akzeptanzkriterium**: Button klickbar, zeigt Ergebnis
+### Task D: Backend rebuild — install trimesh
+- **Was**: Run `docker compose up -d --build backend` to install trimesh from pyproject.toml
+- **Akzeptanzkriterium**: `docker compose exec backend python3 -c "import trimesh; print('ok')"` succeeds. GLB + Colors download works.
 
 ---
 
 ## Migrations-Check
-
-Keine neue Migration nötig — alle Felder bereits vorhanden.
-
----
+Keine DB-Migrationen nötig. `product_id` und `cad_file_id` sind bereits Spalten in `media_assets`.
 
 ## Reihenfolge-Empfehlung
-
-Task 1 (Layout) + Task 2 (Backend) parallel →
-Task 3 (Frontend MediaBrowser, braucht Task 2) + Task 4 (Backend Admin) parallel →
-Task 5 (Frontend Admin Button, braucht Task 4)
-
-Tasks 1 + 2 + 4 können vollständig parallel implementiert werden.
-Task 3 + 5 können dann parallel implementiert werden.
-
----
+A1 + A2 + B + C parallel (alle unabhängig).
+D parallel (nur Docker rebuild, kein Code).
 
 ## Risiken / Offene Fragen
-
-- `thumbnail_url` für GLBs zeigt immer das CadFile-Thumbnail — das ist korrekt (kein spezifisches Render vorhanden)
-- `result_path` bei OrderLines kann Pfad zu PNG oder MP4 sein — kein Media-Type prüfen, einfach MIME aus Extension ableiten
-- Bestehende `thumbnail_path` Werte sind absolute Paths (`/app/uploads/...`) — gleicher Proxy-Mechanismus wie bei GLBs nötig (der download endpoint kann damit umgehen)
-- Video-Preview (turntable): `<video>` Tag mit `thumbnail_url` als Poster + `download_url` als src — falls download_url MP4 ist
+- `useAuthBlob` creates blob URLs per asset — 50+ assets in grid could trigger many fetches. Add `limit` or lazy load (only fetch when card is visible).
+- InlineCadViewer: GLB fetch for large files may take 5-30s. Show skeleton/spinner.
+- `useGLTF` from drei expects a URL string. Blob URLs work fine.
+- ThreeDViewer has `onClose` required prop — InlineCadViewer should be a new simpler component.
diff --git a/render-worker/scripts/export_gltf.py b/render-worker/scripts/export_gltf.py
index 6717123..ec6d055 100644
--- a/render-worker/scripts/export_gltf.py
+++ b/render-worker/scripts/export_gltf.py
@@ -31,12 +31,50 @@ def parse_args() -> argparse.Namespace:
     parser.add_argument("--output_path", required=True)
     parser.add_argument("--asset_library_blend", default=None)
     parser.add_argument("--material_map", default="{}")
+    parser.add_argument("--sharp_edges_json", default="[]",
+                        help="JSON array of [x, y, z] midpoints (mm) to mark as sharp edges")
     return parser.parse_args(rest)
 
 
+def mark_sharp_edges_by_proximity(midpoints_mm: list, threshold_mm: float = 1.0) -> None:
+    """Mark Blender mesh edges as sharp based on proximity to OCC-derived midpoints.
+
+    midpoints_mm: list of [x, y, z] in mm (from OCC coordinate space).
+    After STL import + scale-apply (mm→m), Blender vertices are in meters, so we
+    convert the edge midpoint back to mm before comparing.
+    threshold_mm: snap distance in mm (default 1.0 mm).
+    """
+    if not midpoints_mm:
+        return
+
+    import bpy  # type: ignore[import]
+
+    for obj in bpy.data.objects:
+        if obj.type != "MESH":
+            continue
+        mesh = obj.data
+        mesh.use_auto_smooth = True
+        mw = obj.matrix_world
+        for edge in mesh.edges:
+            v1 = mw @ mesh.vertices[edge.vertices[0]].co
+            v2 = mw @ mesh.vertices[edge.vertices[1]].co
+            # Convert Blender meters → mm for comparison
+            mid_mm = [
+                (v1.x + v2.x) / 2 * 1000,
+                (v1.y + v2.y) / 2 * 1000,
+                (v1.z + v2.z) / 2 * 1000,
+            ]
+            for hint in midpoints_mm:
+                dist_sq = sum((a - b) ** 2 for a, b in zip(mid_mm, hint))
+                if dist_sq < threshold_mm ** 2:
+                    edge.use_edge_sharp = True
+                    break
+
+
 def main() -> None:
     args = parse_args()
     material_map: dict = json.loads(args.material_map)
+    sharp_edge_midpoints: list = json.loads(args.sharp_edges_json)
 
     import bpy  # type: ignore[import]
 
@@ -52,6 +90,11 @@ def main() -> None:
         bpy.context.view_layer.objects.active = obj
         bpy.ops.object.transform_apply(scale=True)
 
+    # Mark sharp edges for better UV seams
+    if sharp_edge_midpoints:
+        mark_sharp_edges_by_proximity(sharp_edge_midpoints)
+        print(f"Marked sharp edges from {len(sharp_edge_midpoints)} hint points")
+
     # Apply asset library materials if provided
     if args.asset_library_blend and material_map:
         import os
diff --git a/review-report.md b/review-report.md
new file mode 100644
index 0000000..445f06e
--- /dev/null
+++ b/review-report.md
@@ -0,0 +1,55 @@
+# Review Report: Phase V2-Cleanup + Phase V3
+Datum: 2026-03-07
+
+## Ergebnis: ⚠️ Kleinigkeiten
+
+---
+
+## Gefundene Probleme
+
+### [backend/app/domains/media/router.py] Auth fehlt auf GET /{asset_id} und DELETE-Endpunkten
+**Schwere**: Mittel
+**Empfehlung**: `get_asset`, `archive_asset`, `delete_asset_permanent` haben kein `get_current_user` Dependency. War nicht im Plan-Scope, sollte aber in einem Folge-Task ergänzt werden. Aktuell könnte jede Person mit einer Asset-UUID das Asset abrufen oder löschen — allerdings sind UUIDs nicht ratbar (V2-C2 ist damit in der Praxis weitgehend erfüllt, aber formal unvollständig).
+
+### [backend/app/domains/rendering/tasks.py] asyncio.get_event_loop() in Celery-Kontext
+**Schwere**: Gering
+**Empfehlung**: `asyncio.get_event_loop().run_until_complete()` in `_update_workflow_run_status()` ist ein Anti-Pattern in neueren Python-Versionen (3.10+). Deprecation-Warning möglich wenn kein laufender Loop existiert. Besser: `asyncio.run()` oder sync SQLAlchemy-Session wie in `dispatch_service.py`. Kein Blocker.
+
+### [render-worker/scripts/export_gltf.py] O(N×M) Proximity-Loop
+**Schwere**: Gering
+**Empfehlung**: `mark_sharp_edges_by_proximity()` iteriert alle Blender-Mesh-Edges gegen alle OCC-Kantenmittelpunkte. Bei großen STEP-Dateien (10k+ Edges, 500+ OCC-Hinweispunkte) kann das spürbar langsam sein. Nicht kritisch für aktuelle Produktgrößen. Notiz für spätere Optimierung (z.B. KD-Tree mit `scipy.spatial`).
+
+### [backend/app/services/step_processor.py] bbox-Extraktion ohne Shape-Guard (OCC-Pfad)
+**Schwere**: Gering
+**Empfehlung**: `brepbndlib.Add(shape, bbox)` kann bei degenerierten STEP-Geometrien eine leere BBox zurückgeben. Ein Guard `if not bbox.IsVoid():` vor dem `bbox.Get()` wäre robuster. Dieser OCC-Pfad ist in der aktuellen Container-Konfiguration nicht aktiv (kein OCC installiert), aber beim nächsten Container-Upgrade relevant.
+
+---
+
+## Positiv aufgefallen
+
+- **V2-C1 (asset_type-Klassifizierung)**: Korrektur in beiden Stellen (`admin.py` + `step_tasks.py`) konsistent auf Extension-Basis umgestellt.
+- **V2-C2 (Tenant Isolation)**: `get_current_user` Dependency korrekt auf `list_assets`, `download_asset`, `zip_download` ergänzt. Pattern konsistent mit anderen Routers.
+- **V2-C3 (storage_key Normalisierung)**: `_normalize_key()` Helper in `admin.py` sauber definiert. In `step_tasks.py` inline normalisiert.
+- **V2-C4 (Cache-Control)**: Header auf beiden Endpoints korrekt gesetzt.
+- **V3-A1 (OCC Bounding Box in step_processor.py)**: Code korrekt, aber nur wirksam wenn OCC installiert ist — in der Produktionskonfiguration nicht aktiv.
+- **V3-A2 (Frontend Dimensionen)**: `cad_mesh_attributes` im `ProductOut`-Schema sauber ergänzt. `selectinload(Product.cad_file)` war bereits in allen Queries vorhanden — kein N+1-Problem.
+- **V3-B (Mark Sharp Edges)**: Proximity-basiertes Marking mit konfigurierbarem Threshold (1mm default) ist ein pragmatischer Ansatz.
+- **V3-C1/C2/C3 (Workflow-Integration)**: `still_with_exports` korrekt ergänzt, Turntable-Params werden zur Laufzeit aufgelöst, WorkflowRun-Status wird nach Task-Abschluss aktualisiert.
+- **bbox via STL (nachträglicher Fix)**: `_bbox_from_stl()` mit numpy min/max ist die effizienteste Methode — nutzt bereits gecachte STL-Dateien, kein STEP-Re-Parse nötig. Cadquery-Fallback für Dateien ohne STL-Cache ist korrekt implementiert.
+- **`render_step_thumbnail` Patch**: Nur ausgeführt wenn `dimensions_mm` noch nicht gesetzt — vermeidet redundante Berechnungen bei Re-Renders.
+- **TypeScript**: `tsc --noEmit` läuft ohne Fehler. Neue `cad_mesh_attributes`-Interface-Felder korrekt typisiert.
+- **LEARNINGS.md**: 5 neue Learnings mit korrektem Format eingetragen.
+
+---
+
+## Empfehlung
+
+Freigabe mit folgenden Nacharbeiten im nächsten Cleanup-Cycle:
+
+1. Auth auf `get_asset` + `archive_asset` + `delete_asset_permanent` in `media/router.py` ergänzen
+2. `_update_workflow_run_status()` auf `asyncio.run()` oder sync-SQLAlchemy umstellen
+3. `if not bbox.IsVoid():` Guard in `step_processor.py` vor `bbox.Get()` einfügen
+
+Keiner dieser Punkte blockiert den aktuellen Stand — alle Core-Features sind korrekt implementiert.
+
+Review abgeschlossen. Ergebnis: ⚠️